10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_________________________________

FORM 10-Q

_________________________________

(MARK ONE)

xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

OR

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM              TO             

Commission file number 001-34717

__________________________

Alpha and Omega Semiconductor Limited

(Exact name of Registrant as Specified in its Charter)

Bermuda	77-0553536
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)

Clarendon House, 2 Church Street

Hamilton HM 11, Bermuda

(Address of Principal Registered

Offices including Zip Code)

(408) 830-9742

(Registrant's Telephone Number, Including Area Code)

__________________________________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months, (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x     No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company”, and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  o	Accelerated filer  x	Non-accelerated filer  o
		(Do not check if a smaller reporting company)
Smaller reporting company   o	Emerging growth company o

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  o    No  x

Number of common shares outstanding as of October 31, 2017: 23,875,051

Alpha and Omega Semiconductor Limited

Form 10-Q

Fiscal First Quarter Ended September 30, 2017

TABLE OF CONTENTS

		Page
Part I.	FINANCIAL INFORMATION
Item 1.	Financial Statements:	1
	Condensed Consolidated Balance Sheets as of September 30, 2017 and June 30, 2017 (Unaudited)	1
	Condensed Consolidated Statements of Operations for the Three Months Ended September 30, 2017 and 2016 (Unaudited)	3
	Condensed Consolidated Statements of Comprehensive Income (Loss) for the Three Months Ended September 30, 2017 and 2016 (Unaudited)	4
	Condensed Consolidated Statements of Cash Flows for the three Months Ended September 30, 2017 and 2016 (Unaudited)	5
	Notes to Condensed Consolidated Financial Statements (Unaudited)	6
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	21
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	31
Item 4.	Controls and Procedures	31
Part II.	OTHER INFORMATION
Item 1.	Legal Proceedings	32
Item 1A.	Risk Factors	32
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	32
Item 3.	Defaults Upon Senior Securities	33
Item 4.	Mine Safety Disclosures	33
Item 5.	Other Information	33
Item 6.	Exhibits	34
	Signatures	35

PART I. FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

ALPHA AND OMEGA SEMICONDUCTOR LIMITED
CONDENSED CONSOLIDATED BALANCE SHEETS
(Unaudited, in thousands except par value per share)
	September 30, 2017			June 30, 2017
ASSETS
Current assets:
Cash and cash equivalents	$	180,165		$	115,708
Restricted cash	1,033			221
Accounts receivable, net	25,406			28,410
Inventories	79,187			76,254
Other current assets	6,415			4,883
Total current assets	292,206			225,476
Property, plant and equipment, net	158,973			139,387
Intangible assets, net	13,003			282
Land use rights, net	8,941			8,804
Deferred income tax assets - long-term	4,568			4,594
Other long term assets	14,891			19,865
Total assets	$	492,582		$	398,408
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	60,140		$	63,134
Accrued liabilities	37,321			28,386
Income taxes payable	2,393			1,748
Deferred margin	942			814
Capital leases	837			828
Total current liabilities	101,633			94,910
Income taxes payable - long-term	931			922
Deferred income tax liabilities	2,736			2,659
Capital leases - long-term	659			866
Other long term liabilities	462			502
Total liabilities	106,421			99,859
Commitments and contingencies (Note 11)
Equity:
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares, issued and outstanding: none at September 30, 2017 and June 30, 2017	—			—
Common shares, par value $0.002 per share:
Authorized: 50,000 shares, issued and outstanding: 29,640 shares and 24,038 shares, respectively at September 30, 2017 and 29,600 shares and 23,992 shares, respectively at June 30, 2017	59			59
Treasury shares at cost, 5,602 shares at September 30, 2017 and 5,608 shares at June 30, 2017	(49,791		)	(49,836		)
Additional paid-in capital	208,336			206,332
Accumulated other comprehensive income	673			306
Retained earnings	113,238			113,909
Total Alpha and Omega Semiconductor Limited shareholder's equity	272,515			270,770
Noncontrolling interest	113,646			27,779
Total equity	386,161			298,549
Total liabilities and equity	$	492,582		$	398,408

1

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited, in thousands except par value per share)

See accompanying notes to these condensed consolidated financial statements.

2

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited, in thousands except per share data)

	Three Months Ended September 30,
	2017			2016
Revenue	$	104,858		$	97,362
Cost of goods sold	77,328			75,418
Gross profit	27,530			21,944
Operating expenses
Research and development	8,325			7,019
Selling, general and administrative	14,615			11,183
Total operating expenses	22,940			18,202
Operating income	4,590			3,742
Interest income and other income (loss), net	40			(49		)
Interest expense	(17		)	(26		)
Net income before income taxes	4,613			3,667
Income tax expense	1,274			1,237
Net income including noncontrolling interest	3,339			2,430
Net loss attributable to noncontrolling interest	(1,461		)	(877		)
Net income attributable to Alpha and Omega Semiconductor Limited	$	4,800		$	3,307
Net income per common share attributable to Alpha and Omega Semiconductor Limited
Basic	$	0.20		$	0.14
Diluted	$	0.19		$	0.14
Weighted average number of common shares attributable to Alpha and Omega Semiconductor Limited used to compute net income per share
Basic	24,021			23,031
Diluted	24,960			24,413

See accompanying notes to these condensed consolidated financial statements.

3

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(Unaudited, in thousands)

	Three Months Ended September 30,
	2017			2016
Net income including noncontrolling interest	$	3,339		$	2,430
Other comprehensive income, net of tax
Foreign currency translation adjustment	701			70
Comprehensive income	4,040			2,500
Noncontrolling interest	(1,127		)	(898		)
Comprehensive income attributable to Alpha and Omega Semiconductor Limited	$	5,167		$	3,398

See accompanying notes to these condensed consolidated financial statements.

4

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, in thousands)

	Three Months Ended September 30,
	2017			2016
Cash flows from operating activities
Net income	3,339			$	2,430
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	6,978			6,503
Share-based compensation expense	2,008			1,316
Deferred income taxes, net	103			6,645
(Gain) loss on disposal of property and equipment	11			(377		)
Changes in assets and liabilities:
Accounts receivable, net	3,004			(465		)
Inventories	(2,932		)	(1,170		)
Other current and long-term assets	(3,202		)	(5,690		)
Accounts payable	(70		)	(2,804		)
Income taxes payable	655			327
Accrued and other liabilities	2,356			2,582
Net cash provided by operating activities	12,250			9,297
Cash flows from investing activities
Purchases of property and equipment excluding JV Company	(7,118		)	(5,306		)
Purchases of property and equipment in JV Company	(21,171		)	(3,331		)
Purchases of land use rights in JV Company	—			(8,737		)
Purchase of intangible assets	(5,720		)	—
Proceeds from sale of property and equipment	—			417
Increase in restricted cash	(812		)	(37		)
Net cash used in investing activities	(34,821		)	(16,994		)
Cash flows from financing activities
Proceeds from investment by noncontrolling interest	86,994			33,000
Withholding tax on restricted stock units	(129		)	(132		)
Proceeds from exercise of stock options	179			6,011
Principal payments on capital leases	(198		)	(215		)
Net cash provided by financing activities	86,846			38,664
Effect of exchange rate changes on cash and cash equivalents	182			33
Net increase in cash and cash equivalents	64,457			31,000
Cash and cash equivalents at beginning of period	115,708			87,774
Cash and cash equivalents at end of period	$	180,165		$	118,774
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	$	23,894		$	5,226
Re-issuance of treasury stock	$	(9	)	$	10

See accompanying notes to these condensed consolidated financial statements.

5

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. The Company and Significant Accounting Policies

The Company

Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company,” "AOS," "we" or "us") design, develop and supply a broad range of power semiconductors. The Company's portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. The Company conducts its operations primarily in the United States of America (“USA”), Hong Kong, China, Taiwan, Korea, Germany and Japan.

Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the periods presented have been included in the interim periods. Operating results for the three months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2018. The condensed consolidated balance sheet at June 30, 2017 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China (the "Chongqing Funds") to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contributions from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company. The Company owns 51% and the Chongqing Funds own 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has a controlling financial interest.

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's condensed consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Fair Value of Financial Instruments

The fair values of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities.

Comprehensive Income (Loss)

6

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

In May 2017, the FASB issued Accounting Standard Updates ("ASU") ASU 2017-09, "Compensation -Stock Compensation: Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 is an update to the existing guidance to clarify when modification accounting would be applied for a change to the terms or conditions of a share-based award. Under this new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award changes as a result of the change in terms or conditions. This ASU will be effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 with early adoption permitted. The Company does not regularly modify the terms and conditions of its share-based awards and does not expect the adoption of this guidance to have a significant impact on its financial statements.

In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows: Restricted Cash ("ASU 2016-18"). ASU 2016-18 requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. This ASU will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted and requires retrospective adoption.  The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). ASU 2016-15 identifies how certain cash receipts and cash payments are presented and classified in the Statement of Cash Flows under Topic 230. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted.  Upon adoption, entities must apply the guidance retrospectively to all periods presented. The Company is currently evaluating the impact the adoption of ASU 2016-15 will have on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. Subsequently, the FASB has issued the following standards related to ASU 2014-09: ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (“ASU 2016-08”); ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”); ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”); and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers (“ASU 2016-20”).  The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standards”). The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). The Company will adopt the new revenue standards in its first quarter of fiscal year 2019 utilizing the modified retrospective method. While the Company is still in the process of completing its analysis on the impact this guidance will have on the Company's consolidated financial statements, related disclosures, and its internal controls over financial reporting, the Company cannot reasonably estimate quantitative information at this time.

7

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

2. Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited

The following table presents the calculation of basic and diluted net income per share attributable to common shareholders:

	Three Months Ended September 30,
	2017		2016
	(in thousands, except per share data)
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$	4,800	$	3,307
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Diluted:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	939		1,382
Weighted average number of common shares used to compute diluted net income per share	24,960		24,413
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	0.20	$	0.14
Diluted	$	0.19	$	0.14

The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive:

	Three Months Ended September 30,
	2017	2016
	(in thousands)
Employee stock options and RSUs	172	247
ESPP	90	—
Total potential dilutive securities	262	247

8

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

3. Concentration of Credit Risk and Significant Customers

The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application and review of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers.

Credit sales, which are mainly on credit terms of 30 to 60 days, are only made to customers who meet the Company's credit requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, when available.

Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts:

	Three Months Ended September 30,
Percentage of revenue	2017		2016
Customer A	27.5	%	24.2	%
Customer B	33.9	%	36.5	%
Customer C	*		13.9	%

* Less than 10%

	September 30, 2017		June 30, 2017
Percentage of accounts receivable
Customer A	31.3	%	33.2	%
Customer B	12.6	%	13.2	%
Customer C	21.0	%	16.4	%

9

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

4. Balance Sheet Components

Accounts receivable, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Accounts receivable	$	45,742		$	48,039
Less: Allowance for price adjustments	(20,306		)	(19,599		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	25,406		$	28,410

Inventories:

	September 30, 2017		June 30, 2017
	(in thousands)
Raw materials	$	33,717	$	32,118
Work in-process	37,076		36,081
Finished goods	8,394		8,055
	$	79,187	$	76,254

Property, plant and equipment, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land	$	4,877		$	4,877
Building	4,325			4,325
Manufacturing machinery and equipment	230,559			215,275
Equipment and tooling	14,310			13,549
Computer equipment and software	24,804			24,346
Office furniture and equipment	1,856			1,935
Leasehold improvements	29,278			29,136
	310,009			293,443
Less accumulated depreciation	(202,984		)	(194,837		)
	107,025			98,606
Equipment and construction in progress	51,948			40,781
Property, plant and equipment, net	$	158,973		$	139,387

10

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Intangible assets, net:

	September 30, 2017			June 30, 2017
	(in thousands)
License fees	$	13,969		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	15,387			2,666
Less accumulated amortization	(2,653		)	(2,653		)
	12,734			13
Goodwill	269			269
Intangible assets, net	$	13,003		$	282

Land use rights, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land use rights	$	9,032		$	8,849
Less accumulated amortization	(91		)	(45		)
Land use rights, net	$	8,941		$	8,804

Other long-term assets:

	September 30, 2017		June 30, 2017
	(in thousands)
Prepayments for property and equipment	$	11,800	$	12,964
Investment in a privately held company	700		700
Prepaid income tax	—		4,377
Office leases deposits	2,000		1,608
Other	391		216
	$	14,891	$	19,865

Accrued liabilities:

	September 30, 2017		June 30, 2017
	(in thousands)
Accrued compensation and benefits	$	15,090	$	13,727
Warranty accrual	1,622		1,866
Stock rotation accrual	1,994		1,871
Accrued professional fees	1,795		2,500
Accrued inventory	608		410
Accrued facilities related expenses	1,719		1,501
Accrued license fees	7,000		—
Other accrued expenses	7,493		6,511
	$	37,321	$	28,386

11

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,866		$	1,495
Additions (Reductions)	(237		)	1,491
Utilization	(7		)	(48		)
Ending balance	$	1,622		$	2,938

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,871		$	1,988
Additions	791			1,626
Utilization	(668		)	(1,599		)
Ending balance	$	1,994		$	2,015

5. Debt

On August 15, 2017, the Company's Oregon subsidiary, Jireh Semiconductor Incorporated (“Jireh”), entered into a credit agreement with a financial institution (the “Bank”) that provides a term loan in an amount up to $30.0 million for the purpose of purchasing certain equipment for our fabrication facility located in Oregon.  The obligation under the credit agreement is secured by substantially all assets of Jireh and guaranteed by the Company.  The credit agreement has a five-year term and matures on August 15, 2022, and Jireh may draw down the loan at any time during the first year.  After the first year, Jireh is required to pay to the Bank on each payment date, the outstanding principal amount of the loan in monthly installments.  The loan accrues interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the credit agreement, plus specified applicable margin based on the outstanding balance of the loan.  The credit agreement contains customary restrictive covenants and includes certain financial covenants that require the Company to maintain, on a consolidated basis, specified financial ratios and fixed charge coverage ratio. As of September 30, 2017, the Company recorded approximately $0.1 million of transaction costs and had no outstanding balance of the loan.

12

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

6. Joint Venture

On March 29, 2016, the Company entered into a joint venture contract (the “JV Agreement”) with two investment funds owned by the Municipality of Chongqing (the “Chongqing Funds”), pursuant to which the Company and the Chongqing Funds formed a joint venture, (the “JV Company”), for the purpose of constructing and operating a power semiconductor packaging, testing and 12-inch wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which includes cash contribution from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company.  The Initial Capitalization is expected to be completed in stages.  The Company owns 51%, and the Chongqing Funds own 49%, of the equity interest in the JV Company. If both parties agree that the termination of the JV Company is the best interest of each party or the JV Company is bankrupt or insolvent where either party may terminate early, after paying the debts of the JV Company, the remaining assets of the JV Company shall be paid to the Chongqing Funds to cover the principal of its total paid-in contributions plus interest at 10% simple annual rate prior to distributing the balance of the JV Company's assets to the Company. The Company expects the JV Company to commence initial production in mid-calendar year 2018.

There is no private land ownership in China. Individuals and companies are permitted to acquire land use rights for specific purpose. In September 2016, the JV Company paid approximately $8.7 million for land use rights to build the manufacturing facility. In March 2017, the JV Company received the necessary land use right certificate from the PRC government. The land use rights will expire on November 30, 2066.

As part of the JV Transaction, the JV Company entered into an Engineering, Procurement and Construction Contract (the “EPC Contract”) with The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited (the “Contractor”), effective as of January 10, 2017 (the "Effective Date"), pursuant which the Contractor was engaged to construct the manufacturing facility contemplated under the JV Agreement. Under the EPC Contract, the Contractor’s obligations include, but are not limited to: (i) the development of conceptual design, initial design, construction drawing design and optimization, and submission of such designs to the JV Company for examination and confirmation; and (ii) the construction of the assembly and wafer fabrication facilities and related procurement services, including the selection and engagement of subcontractors, in accordance with a construction schedule agreed upon by the parties. The total price payable under the EPC Contract is Chinese Renminbi (RMB) 540.0 million, or approximately $78.0 million based on the currency exchange rate between RMB and U.S. Dollars on the Effective Date, which consists of $2.8 million (RMB 19.5 million) of design fees (“Design Fees”) and $75.2 million (RMB 520.5 million) of construction and procurement fees (including compliance with safety and aesthetic requirements) (“Construction Fees”). The Design Fees and Construction Fees will be paid by the JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones, approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively. The payment may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately$30.1 million under the EPC Contract.

The Company began consolidating the financial statements of the JV Company in the quarter ended June 30, 2016. The Chongqing Funds contributed $87.0 million initial capital in cash during the three months ended September 30, 2017. As of September 30, 2017, the Chongqing Funds contributed an aggregate of $120.0 million of initial capital in cash and the Company contributed cash of $10.0 million and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company.

13

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The changes in total stockholders' equity and noncontrolling interest were as follows (in thousands):

	Total AOS Stockholders' Equity			Noncontrolling Interest			Total Equity
Balance, June 30, 2017	$	270,770		$	27,779		$	298,549
Exercise of common stock options and release of RSUs	234			—			234
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	(55		)	—			(55		)
Withholding tax on restricted stock units	(129		)	—			(129		)
Stock-based compensation expense	2,008			—			2,008
Net income (loss)	4,800			(1,461		)	3,339
Deferred tax asset related to ASU 2016-16 adoption	(5,480		)	—			(5,480		)
Cumulative translation adjustment	367			334			701
Contributions from noncontrolling interest	—			86,994			86,994
Balance, September 30, 2017	$	272,515		$	113,646		$	386,161

7. Shareholders' Equity and Share-based Compensation

Share Repurchase

In September 2017, the Board of Directors terminated the repurchase program that was previously approved in 2015 and approved a new repurchase program (the “Repurchase Program”), which allows the Company to repurchase its common shares from the open market pursuant to a pre-established Rule 10b5-1 trading plan or through privately negotiated transactions up to an aggregate of $30.0 million. The amount and timing of any repurchases under the Repurchase Program depend on a number of factors, including but not limited to, the trading price, volume and availability of the Company's common shares. Shares repurchased under this program are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity.

During the three months ended September 30, 2017, the Company did not repurchase any shares pursuant to the Repurchase Program or the prior repurchase program.  Since the inception of the prior repurchase program in 2010, the Company repurchased an aggregate of 5,723,093 shares from the open market including shares purchased in the Tender Offer for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses.  No repurchased shares have been retired. Of the 5,723,093 repurchased shares, 120,504 shares with a weighted average repurchase price of $10.73 per share, were reissued at an average price of $6.09 per share pursuant to option exercises and vested restricted share units. As of September 30, 2017, $30.0 million remained available under the Repurchase Program.

Stock Options

The Company did not grant any stock options during the three months ended September 30, 2017. Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

14

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The following table summarizes the Company's stock option activities for the three months ended September 30, 2017:

					Weighted
			Weighted		Average
			Average		Remaining
	Number of		Exercise Price		Contractual	Aggregate
	Shares		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2017	1,053,367		$	10.98	4.43	$	6,212,660
Granted	—		$	—
Exercised	(18,265	)	$	9.79		$	112,089
Canceled or forfeited	—		$	—
Outstanding at September 30, 2017	1,035,102		$	11.00	4.24	$	5,930,320
Options vested and expected to vest	1,033,779		$	11.00	4.24	$	5,918,653
Exercisable at September 30, 2017	964,685		$	11.25	4.09	$	5,303,664

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2017:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2017	1,144,865		$	14.11	1.76	$	19,084,900
Granted	20,176		$	16.48
Vested	(36,366	)	$	13.98
Forfeited	(9,875	)	$	14.09
Nonvested at September 30, 2017	1,118,800		$	14.16	1.56	$	18,449,012
RSUs vested and expected to vest	1,001,288				1.49	$	16,511,235

The fair value of RSU is based on the market price of the Company's share on the date of grant.

In March 2017, the Company granted 170,000 performance-based RSUs (“PRSUs”) to its key personnel. The number shares to be issued under the PRSU will be determined based on the level of attainment of predetermined financial goals. The PRSU will vest in four equal annual installments from March 15, 2018 if certain predetermined financial goals were met. The Company recorded approximately $0.2 million of expenses for these PRSUs in the three months ended September 30, 2017.

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2017
Volatility rate	44.7%
Risk-free interest rate	1.0% - 1.3%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation Expense

The total share-based compensation expense related to stock options, RSUs and ESPP described above, recognized in the condensed consolidated statements of operations for the periods presented was as follows:

15

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Cost of goods sold	$	316	$	195
Research and development	362		360
Selling, general and administrative	1,330		761
	$	2,008	$	1,316

As of September 30, 2017, total unrecognized compensation cost under the Company's equity plans was $8.2 million, which is expected to be recognized over a weighted-average period of 1.5 years.

8. STMicro License

On September 5, 2017, the Company entered into a license agreement with STMicroelectronics International N.V. (“STMicro”), pursuant to which STMicro granted the Company a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products, which have been offered by STMicro.  This agreement allows the Company to develop and market products in a new market, primarily in the computer server segment. Under the license agreement, the Company agreed to pay a total price in cash of $17.0 million based on the payment schedule of, approximately $10.1 million, $6.7 million and $0.2 million in calendar year 2017, 2018 and 2019, respectively. As of September 30, 2017, the Company recorded $12.7 million in intangible assets, of which $5.6 million was paid to STMicro.

9. Income Taxes

For the three months ended September 30, 2017, the Company recognized income tax expense of approximately $1.3 million, of which $0.4 million was related to a discrete tax expense for an intercompany asset transfer. For the three months ended September 30, 2016, the Company recognized income tax expense of approximately $1.2 million. Excluding the discrete income tax expense, the estimated effective tax rate for the three months ended September 30, 2017 was 19.1% compared to 32.9% for the three months ended September 30, 2016. The changes in the effective tax rate and tax expense between the periods resulted primarily from changes in the mix of earnings in various geographic jurisdictions between the current quarter and the same period of last year.

During the quarter ended September 30, 2016, the Company contributed certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. As a result of the transfer, the Company reduced its deferred tax assets by $6.6 million and recorded a $6.6 million in prepaid tax asset, which was amortized to tax expense over the useful life of the assets. As of June 30, 2017, the prepaid tax asset was amortized down to $5.5 million, of which $1.1 million and $4.4 million were included in prepaid and other current assets and other long-term assets on the Company's balance sheet, respectively. On July 1, 2017, the Company adopted ASU 2016-16, Intra-Entity Transfers of Assets other than Inventory, which resulted in a de-recognition of a prepaid tax asset of $5.5 million related to the prior period intra-entity asset transfer with the JV Company, with an offsetting reduction to retained earnings.  Because the JV Company has a full valuation allowance, there was no change to the Company’s net deferred tax assets.

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2017 remain open to examination by U.S. federal and state tax authorities. The tax years 2010 to 2017 remain open to examination by foreign tax authorities.

The Company's income tax returns are subject to examinations by the Internal Revenue Service and other tax authorities in various jurisdictions. In accordance with the guidance on the accounting for uncertainty in income taxes, the Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. As of September 30, 2017, the gross amount of unrecognized tax benefits was approximately $6.7 million, of which $4.1 million, if recognized, would reduce the effective income tax rate in future periods. If the Company's estimate of income tax liabilities proves to be less than the ultimate assessment, then a further charge to expense would be required. If events occur and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period

16

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

when the Company determines the liabilities are no longer necessary. The Company does not anticipate any material changes to its uncertain tax positions during the next twelve months.

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of share-based compensation expense in an intercompany cost-sharing arrangement. A final decision has yet to be issued by the Tax Court due to other outstanding issues related to the case. At this time, the U.S. Department of the Treasury has not withdrawn the requirement to include share-based compensation from its regulations. Due to the uncertainty surrounding the status of the current regulations, questions related to the scope of potential benefits, and the risk of the Tax Court’s decision being overturned upon appeal, the Company has not recorded any benefit as of September 30, 2017. The Company will continue to monitor ongoing developments and potential impacts to its financial statements.

17

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

10. Segment and Geographic Information

The Company is organized as, and operates in, one operating segment: the design, development and supply of power semiconductor products for computing, consumer electronics, communication and industrial applications. The chief operating decision-maker is the Chief Executive Officer. The financial information presented to the Company's Chief Executive Officer is on a consolidated basis, accompanied by information about revenue by customer and geographic region, for purposes of evaluating financial performance and allocating resources. The Company has one business segment, and there are no segment managers who are held accountable for operations, operating results and plans for products or components below the consolidated unit level. Accordingly, the Company reports as a single operating segment.

The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have a global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets.

The revenue by geographical location in the following tables is based on the country or region to which the products were shipped to:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Hong Kong	$	85,230	$	82,835
China	17,120		12,442
South Korea	287		366
United States	1,378		894
Other Countries	843		825
	$	104,858	$	97,362

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Power discrete	$	83,678	$	71,428
Power IC	18,097		22,998
Packaging and testing services	3,083		2,936
	$	104,858	$	97,362

Long-lived assets, net consisting of property, plant and equipment and land use rights, by geographical area are as follows:

	September 30, 2017		June 30, 2017
	(in thousands)
China	$	103,187	$	85,691
United States	64,014		61,787
Other Countries	713		713
	$	167,914	$	148,191

18

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

11. Commitments and Contingencies

Purchase Commitments

As of September 30, 2017 and June 30, 2017, the Company had approximately $38.7 million and $25.7 million, respectively, of outstanding purchase commitments primarily for purchases of semiconductor raw materials, wafers, spare parts and packaging and testing services, and approximately $65.5 million and $69.2 million, respectively, of capital commitments for the purchase of property and equipment.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contribution from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company. The Company owns 51% and the Chongqing Funds own 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has controlling financial interest.

As of September 30, 2017, the Chongqing Funds contributed an aggregate of $120.0 million of initial capital in cash and the Company contributed $10.0 million in cash and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. The Company expects the JV Company to commence initial production in mid-calendar year 2018.

In January 2017, the JV Company entered into an Engineering, Procurement and Construction Contract (the "EPC Contract") with The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited. The total price payable by the JV Company under the EPC Contract is approximately $78.0 million, which consists of $2.8 million of design fees and $75.2 million of construction and procurement fees. These fees will be paid by the JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones, approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively. The payment may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately $30.1 million under the EPC Contract.

STMicro License

On September 5, 2017, the Company entered into a license agreement with STMicroelectronics International N.V. (“STMicro”), pursuant to which STMicro granted the Company a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products, which have been offered by STMicro.  Under the license agreement, the Company agreed to pay a total price in cash of $17.0 million based on the payment schedule of, approximately $10.1 million, $6.7 million and $0.2 million in calendar year 2017, 2018 and 2019, respectively. As of September 30, 2017, the Company recorded $12.7 million in intangible assets, of which $5.6 million was paid to STMicro.

Contingencies and Indemnities

The Company is currently not a party to any pending material legal proceedings. The Company has in the past, and may from time to time in the future, become involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, the Company could incur significant costs in the defense of such claims and suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it has contracted with various third parties. Pursuant to these agreements, the Company may be obligated to indemnify another party to such an agreement with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold, certain intellectual property rights, specified environmental matters and certain income taxes. In these circumstances, payment by the Company is customarily conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other

19

ALPHA AND OMEGA SEMICONDUCTOR LIMITED

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

party's claim. Further, the Company's obligations under these agreements may be limited in time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. The Company has not historically paid or recorded any material indemnifications and no accrual has been made at September 30, 2017 and June 30, 2017.

The Company has agreed to indemnify its directors and certain employees as permitted by law and pursuant to its bye-laws, and has entered into indemnification agreements with its directors and executive officers. The Company has not recorded a liability associated with these indemnification arrangements, as it historically has not incurred any material costs associated with such indemnification obligations. Costs associated with such indemnification obligations may be mitigated by insurance coverage that the Company maintains. However, such insurance may not cover any, or may cover only a portion of, the amounts the Company may be required to pay. In addition, the Company may not be able to maintain such insurance coverage in the future.

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ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Except for the historical information contained herein, the matters addressed in this Item 2 constitute “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Such forward-looking statements are subject to a variety of risks and uncertainties, including those discussed below under the heading “Risk Factors” and elsewhere in this Quarterly Report on Form 10-Q, that could cause actual results to differ materially from those anticipated by the Company’s management. The Private Securities Litigation Reform Act of 1995 (the “Act”) provides certain “safe harbor” provisions for forward-looking statements. All forward-looking statements made in this Quarterly Report on Form 10-Q are made pursuant to the Act. The Company undertakes no obligation to publicly release the results of any revisions to its forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unexpected events. Unless the context otherwise requires, the words “AOS,” the “Company,” “we,” “us” and “our” refer to Alpha and Omega Semiconductor Limited and its subsidiaries.

This management’s discussion should be read in conjunction with the management’s discussion included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017, filed with the Securities and Exchange Commission on September 5, 2017.

Overview

We are a designer, developer and global supplier of a broad portfolio of power semiconductors. Our portfolio of power semiconductors includes approximately 1,700 products, and has grown with the introduction of 80 new products during the fiscal year ended June 30, 2017, and over 90 new products during each of the fiscal years ended June 30, 2016 and 2015. During the three months ended September 30, 2017, we introduced an additional 41 new products. Our teams of scientists and engineers have developed extensive intellectual properties and technical knowledge that encompass major aspects of power semiconductors, which we believe enables us to introduce and develop innovative products to address the increasingly complex power requirements of advanced electronics. We have an extensive patent portfolio that consists of 688 patents and 121 patent applications in the United States as of September 30, 2017. We differentiate ourselves by integrating our expertise in technology, design and advanced packaging to optimize product performance and cost. Our portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment.

Our business model leverages global resources, including research and development and manufacturing in the United States and Asia. Our sales and technical support teams are localized in several growing markets. We operate a 200mm wafer fabrication facility in Hillsboro, Oregon, or the Oregon fab, which is critical for us to accelerate proprietary technology development and new product introduction as well as to improve our financial performance in the long run. To meet the market demand for more mature high volume products, we also utilize the wafer manufacturing capacity of selected third party foundries. For assembly and test, we primarily rely upon our in-house facilities in China. In addition, we utilize subcontracting partners for industry standard packages. We believe our in-house packaging and testing capability provides us with a competitive advantage in proprietary packaging technology, product quality, cost and sales cycle time.

On September 5, 2017, we entered into a license agreement with STMicroelectronics International N.V. (“STMicro”), pursuant to which STMicro granted us a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products, which have been previously offered by STMicro.  Under the license agreement, we agreed to pay a total price in cash of $17.0 million based on the payment schedule as set forth in the agreement, approximately $10.1 million, $6.7 million and $0.2 million in calendar year 2017, 2018 and 2019, respectively. As of September 30, 2017, we recorded $12.7 million in intangible assets, of which $5.6 million was paid to STMicro.

On March 29, 2016, we entered into a joint venture contract (the “JV Agreement”) with two investment funds owned by the Municipality of Chongqing (the “Chongqing Funds”), pursuant to which we and the Chongqing Funds formed a joint venture, (the “JV Company”), for the purpose of constructing a power semiconductor packaging, testing and wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which will be completed in stages. As of September 30, 2017, the Chongqing Funds contributed a total of $120.0 million of initial capital in cash and we contributed $10.0 million in cash and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. We own 51%, and the Chongqing Funds own 49%, of the equity interest in the JV Company. If both parties agree that the termination of the JV Company is the best interest of each party or the JV Company is bankrupt or insolvent where

21

either party may terminate early, after paying the debts of the JV Company, the remaining assets of the JV Company shall be paid to the Chongqing Funds to cover the principal of its total paid-in contributions plus interest at 10% simple annual rate prior to distributing the balance of the JV Company's assets to us. We expect the JV Company to commence initial production in mid-calendar year 2018. During the three months ended September 30, 2017, we recorded $1.5 million in net loss attributable to noncontrolling interest, representing 49% of the net loss incurred in the JV Company, which was attributable to operating expenses and depreciation expenses offset by equipment lease income and interest income. In the long-term, the JV Company plans to construct and operate a 12-inch wafer fabrication facility for the production of power semiconductors. We expect the joint venture to deliver significant cost savings, and enhance our market positions in China, and drive meaningful improvements in working capital and capital expenditures.

As part of the JV Transaction, the JV Company entered into an Engineering, Procurement and Construction Contract (the “EPC Contract”) with The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited (the “Contractor”), effective as of January 10, 2017 (the "Effective Date"), pursuant which the Contractor was engaged to construct the manufacturing facility contemplated under the JV Agreement. Under the EPC Contract, the Contractor’s obligations include, but are not limited to: (i) the development of conceptual design, initial design, construction drawing design and optimization, and submission of such designs to the JV Company for examination and confirmation; and (ii) the construction of the assembly and wafer fabrication facilities and related procurement services, including the selection and engagement of subcontractors, in accordance with a construction schedule agreed upon by the parties. The total price payable under the EPC Contract is Chinese Renminbi (RMB) 540.0 million, or approximately $78.0 million, based on the currency exchange rate between RMB and U.S. Dollars on the Effective Date, which consists of $2.8 million (RMB 19.5 million) of design fees (“Design Fees”) and $75.2 million (RMB 520.5 million) of construction and procurement fees (including compliance with safety and aesthetic requirements) (“Construction Fees”). The Design Fees and Construction Fees will be paid by JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones, approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively. The payment may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately $30.1 million under the EPC Contract.

During the first quarter of fiscal year of 2018, we released OTF190A60L, the first product in the new αMOS5TMHV MOSFET platform.  This device provides high-efficiency performance in an easy-to-use solution optimized for server power supplies, high-end computers, charging stations and other high-performance applications.  We also introduced AOZ5131QI, the latest generation of power modules. The new device enables high power-density voltage regulator solutions ideal for CPU and GPU power regulation in notebook PCs, servers, and graphic cards. In addition, we expanded our recently launched fast turn-off switched 650V H-series IGBT family with a 1200V rating. The new AOK40B120H1has been developed to address needs of industrial welding and high-frequency converters with 3-phase ac or high voltage dc input. The device offers excellent performance in high switching frequency applications, which can be a perfect fit for high voltage industrial welding machine. 

Factors affecting our performance

Our performance is affected by several key factors, including the following:

The global, regional economic and PC market conditions: Because our products primarily serve consumer electronic applications, a deterioration of the global and regional economic conditions could materially affect our revenue and results of operations. In particular, because a significant amount of our revenue is derived from sales of products in the personal computing ("PC") markets, such as notebooks, motherboards and notebook battery packs, a significant decline or downturn in the PC market can have a material adverse effect on our revenue and results of operations.  Our revenue from the PC market accounted for approximately 38.8% and 35.9% of our total revenue for the three months ended September 30, 2017 and 2016, respectively. In the past, we have experienced a significant global decline in the PC markets due to continued growth of demand in tablets and smart phones, worldwide economic conditions and the industry inventory correction which had and may continue to have a material negative impact on the demand for our products, revenue, factory utilization, gross margin, our ability to resell excess inventory, and other performance measures.

In response to this trend, we executed and continue to execute strategies to diversify our product portfolio, penetrate into other market segments, including the consumer, communications and industrial markets, improve gross margin and profit by implementing cost control measures. While making progress in reducing our reliance on the computing market, we continue to support our computing business and capitalize on the opportunity with a more focused and competitive PC product strategy. If the rate of decline in the PC markets is faster than we expected, or if we cannot successfully diversify or introduce new products to keep pace with the declining PC markets, we may not be able to alleviate its negative impact on our results of operations.

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Manufacturing costs:  Our gross margin may be affected by our manufacturing costs, including utilization of our manufacturing facilities, pricing of wafers from third party foundries and semiconductor raw materials, which may fluctuate from time to time largely due to the market demand and supply.  Capacity utilization affects our gross margin because we have certain fixed costs associated with our packaging and testing facilities and our Oregon fab.  If we are unable to utilize our manufacturing facilities at a desired level, our gross margin may be adversely affected.  In addition, we expect that in the long term our joint venture agreement with the Chongqing Funds will reduce our costs of manufacturing. However, our manufacturing costs may increase in the short term prior to the commencement of operation of the JV Company, because we may be required to incur additional costs to acquire packaging and testing capacity in order make up for the reduced capacity during the period in which we transfer our equipment from Shanghai to Chongqing. Furthermore, from time to time, we may experience wafer capacity constraints, particularly at third party foundries, that may prevent us from fully meeting the demand of our customers. While we can mitigate such constraints by increasing capacity at our own fab, we may not be able to do so quickly or at sufficient level, which could adversely affect our financial conditions and results of operations.

Erosion of average selling price: Erosion of average selling prices of established products is typical in our industry. Consistent with this historical trend, we expect our average selling prices of existing products to decline in the future. However, in the normal course of business, we seek to offset the effect of declining average selling price by introducing new and higher value products, expanding existing products for new applications and new customers and reducing the manufacturing cost of existing products.

Product introductions and customers' product requirements: Our success depends on our ability to introduce products on a timely basis that meet or are compatible with our customers' specifications and performance requirements. Both factors, timeliness of product introductions and conformance to customers' requirements, are equally important in securing design wins with our customers. As we accelerate the development of new technology platforms, we expect to increase the pace at which we introduce new products and obtain design wins. Our failure to introduce new products on a timely basis that meet customers' specifications and performance requirements, particularly those products with major OEM customers, and our inability to continue to expand our serviceable markets, could adversely affect our financial performance, including loss of market share. We believe that the JV Transaction will increase and diversify our customer base, particularly in China, in the long term. We expect the JV Company to commence initial production in mid-calendar year 2018. However, there is no guarantee that the JV Company will commence timely or at all, and we may experience delays in the construction of the facility. Even if we are able to commence JV operation, we may not be successful in acquiring a sufficient number of new customers to offset the additional costs due to various factors, including but are not limited to, competition from other semiconductor companies in the region, our lack of history and prior relationships with customers as a new entrant, difficulties in executing our joint venture strategies, lack of control over our operations and the general economic conditions in Chongqing and China.

Distributor ordering patterns, customer demand and seasonality: Our distributors place purchase orders with us based on their forecasts of end customer demand, and this demand may vary significantly depending on the sales outlook and market and economic conditions of end customers. Because these forecasts may not be accurate, channel inventory held at our distributors may fluctuate significantly, which in turn may prompt distributors to make significant adjustments to their purchase orders placed with us. As a result, our revenue and operating results may fluctuate significantly from quarter to quarter. In addition, because our products are used in consumer electronics products, our revenue is subject to seasonality. Our sales seasonality is affected by numerous factors, including global and regional economic conditions as well as the PC market conditions, revenue generated from new products, changes in distributor ordering patterns in response to channel inventory adjustments and end customer demand for our products and fluctuations in consumer purchase patterns prior to major holiday seasons. In recent periods, broad fluctuations in the semiconductor markets and the global and regional economic conditions, in particular the decline of the PC market conditions, have had a more significant impact on our results of operations than seasonality. Furthermore, our revenue may be impacted by the level of demand from our major customers due to factors outside of our control. If these major customers experience significant decline in the demand of their products, encounter difficulties or defects in their products, or otherwise fail to execute their sales and marketing strategies successfully, it may adversely affect our revenue and results of operations.

Principal line items of statements of operations

The following describes the principal line items set forth in our condensed consolidated statements of operations:

Revenue

We generate revenue primarily from the sale of power semiconductors, consisting of power discretes and power ICs. Because our products typically have three to five year life cycles, the rate of new product introduction is an important driver of revenue growth over time. We believe that expanding the breadth of our product portfolio is important to our business prospects, because it provides us with an opportunity to increase our total bill-of-materials within an electronic system and to address the

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power requirements of additional electronic systems. In addition, a small percentage of our total revenue is generated by providing packaging and testing services to third-parties through one of our subsidiaries.

Our product revenue includes the effect of the estimated stock rotation returns and price adjustments that we expect to provide to our distributors. Stock rotation returns are governed by contract and are limited to a specified percentage of the monetary value of products purchased by the distributor during a specified period. At our discretion or upon our direct negotiations with the original design manufacturers ("ODMs") or original equipment manufacturers ("OEMs"), we may elect to grant special pricing that is below the prices at which we sold our products to the distributors. In these situations, we will grant price adjustments to the distributors reflecting such special pricing. We estimate the price adjustments for inventory at the distributors based on factors such as distributor inventory levels, pre-approved future distributor selling prices, distributor margins and demand for our products.

Cost of goods sold

Our cost of goods sold primarily consists of costs associated with semiconductor wafers, packaging and testing, personnel, including share-based compensation expense, overhead attributable to manufacturing, operations and procurement, and cost associated with yield improvements, capacity utilization, warranty and inventory reserves. As the volume of sales increases, we expect cost of goods sold to increase. We implemented a process to improve our factory capacity utilization rates by transferring more wafer production to our Oregon fab and reducing our reliance on outside foundries. While our utilization rates cannot be immune to market conditions, our goal is to make such rates less vulnerable to market fluctuations. We believe our market diversification strategy and product growth will drive higher volumes of manufacturing which will improve our factory utilization rates and gross margin in the long run.

Operating expenses

Our operating expenses consist of research and development, selling, general and administrative expenses. We expect our operating expenses as a percentage of revenue to fluctuate from period to period as we continue to exercise cost control measures in response to the declining PC market as well as align our operating expenses to the revenue level.

Research and development expenses.  Our research and development expenses consist primarily of salaries, bonuses, benefits, share-based compensation expense, expenses associated with new product prototypes, travel expenses, fees for engineering services provided by outside contractors and consultants, amortization of software and design tools, depreciation of equipment and overhead costs. We continue to invest in developing new technologies and products utilizing our own fabrication and packaging facilities as it is critical to our long-term success. We also evaluate appropriate investment levels and stay focused on new product introductions to improve our competitiveness. We expect that our research and development expenses will fluctuate from time to time.

Selling, general and administrative expenses.  Our selling, general and administrative expenses consist primarily of salaries, bonuses, benefits, share-based compensation expense, product promotion costs, occupancy costs, travel expenses, expenses related to sales and marketing activities, amortization of software, depreciation of equipment, maintenance costs and other expenses for general and administrative functions as well as costs for outside professional services, including legal, audit and accounting services. We expect our selling, general and administrative expenses to fluctuate in the near future as we continue to exercise cost control measures in response to the declining PC market.

Income tax expense

We are subject to income taxes in various jurisdictions. Significant judgment and estimates are required in determining our worldwide income tax expense. The calculation of tax liabilities involves dealing with uncertainties in the application of complex tax regulations of different jurisdictions globally. We establish accruals for potential liabilities and contingencies based on a more likely than not threshold to the recognition and de-recognition of uncertain tax positions. If the recognition threshold is met, the applicable accounting guidance permits us to recognize a tax benefit measured at the largest amount of tax benefit that is more likely than not to be realized upon settlement with a taxing authority. If the actual tax outcome of such exposures is different from the amounts that were initially recorded, the differences will impact the income tax and deferred tax provisions in the period in which such determination is made. Changes in the location of taxable income (loss) could result in significant changes in our income tax expense.

We record a valuation allowance against deferred tax assets if it is more likely than not that a portion of the deferred tax assets will not be realized, based on historical profitability and our estimate of future taxable income in a particular jurisdiction. Our judgments regarding future taxable income may change due to changes in market conditions, changes in tax laws, tax

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planning strategies or other factors. If our assumptions and consequently our estimates change in the future, the deferred tax assets may increase or decrease, resulting in corresponding changes in income tax expense. Our effective tax rate is highly dependent upon the geographic distribution of our worldwide profits or losses, the tax laws and regulations in each geographical region where we have operations, the availability of tax credits and carry-forwards and the effectiveness of our tax planning strategies.

During the quarter ended September 30, 2016, we contributed certain packaging equipment as required by the JV Agreement by transferring the legal title of such equipment to the JV Company. As a result of the transfer, we reduced our deferred tax assets by $6.6 million and recorded a $6.6 million in prepaid tax asset, which was amortized to tax expense over the useful life of the assets. As of June 30, 2017, the prepaid tax asset was amortized down to $5.5 million, of which $1.1 million and $4.4 million were included in prepaid and other current assets and other long-term assets on our balance sheet, respectively. On July 1, 2017, we adopted ASU 2016-16, Intra-Entity Transfers of Assets other than Inventory, which resulted in a de-recognition of a prepaid tax asset of $5.5 million related to the prior period intra-entity asset transfer with the JV Company, with an offsetting reduction to retained earnings.  Because the JV Company has a full valuation allowance, there was no change to our net deferred tax assets.

Results of Operations

The following tables set forth statements of operations, also expressed as a percentage of revenue, for the three months ended September 30, 2017 and 2016. Our historical results of operations are not necessarily indicative of the results for any future period.

	Three Months Ended September 30,
	2017			2016			2017		2016
	(in thousands)						(% of revenue)
Revenue	$	104,858		$	97,362		100.0	%	100.0	%
Cost of goods sold	77,328			75,418			73.7	%	77.5	%
Gross profit	27,530			21,944			26.3	%	22.5	%
Operating expenses
Research and development	8,325			7,019			7.9	%	7.2	%
Selling, general and administrative	14,615			11,183			13.9	%	11.5	%
Total operating expenses	22,940			18,202			21.8	%	18.7	%
Operating income	4,590			3,742			4.5	%	3.8	%
Interest income and other income (loss), net	40			(49		)	—	%	(0.1	)%
Interest expense	(17		)	(26		)	—	%	—	%
Net income before income taxes	4,613			3,667			4.5	%	3.7	%
Income tax expense	1,274			1,237			1.2	%	1.3	%
Net income including noncontrolling interest	3,339			2,430			3.3	%	2.4	%
Net loss attributable to noncontrolling interest	(1,461		)	(877		)	(1.4	)%	(0.9	)%
Net income attributable to Alpha and Omega Semiconductor Limited	$	4,800		$	3,307		4.7	%	3.3	%

Share-based compensation expense was allocated as follow:

	Three Months Ended September 30,
	2017		2016		2017		2016
	(in thousands)				(% of revenue)
Cost of goods sold	$	316	$	195	0.3	%	0.2	%
Research and development	362		360		0.3	%	0.4	%
Selling, general and administrative	1,330		761		1.3	%	0.8	%
Total	$	2,008	$	1,316	1.9	%	1.4	%

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Three Months Ended September 30, 2017 and 2016

Revenue

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2017		2016		Change
	(in thousands)				(in thousands)			(in percentage)
Power discrete	$	83,678	$	71,428	$	12,250		17.2	%
Power IC	18,097		22,998		(4,901		)	(21.3	)%
Packaging and testing services	3,083		2,936		147			5.0	%
	$	104,858	$	97,362	$	7,496		7.7	%

Total revenue was $104.9 million for the three months ended September 30, 2017, an increase of $7.5 million, or 7.7%, as compared to $97.4 million for the same quarter last year. The increase was primarily due to an increase of $12.3 million and $0.1 million in sales of power discrete products and packaging and testing services, respectively, partially offset by a decrease of $4.9 million in sales of power IC products. The net increase in power discrete and power IC product sales was primarily due to a 5.0% increase in unit shipments, as well as a 2.6% increase in average selling price as compared to the same quarter last year due to a shift in product mix. The increase in revenue of packaging and testing services revenue for the three months ended September 30, 2017 as compared to the same quarter last year was primarily due to increased demand.

Cost of goods sold and gross profit

	Three Months Ended September 30,
	2017			2016			Change
	(in thousands)						(in thousands)		(in percentage)
Cost of goods sold	$	77,328		$	75,418		$	1,910	2.5	%
Percentage of revenue	73.7		%	77.5		%
Gross profit	$	27,530		$	21,944		$	5,586	25.5	%
Percentage of revenue	26.3		%	22.5		%

Cost of goods sold was $77.3 million for the three months ended September 30, 2017, an increase of $1.9 million, or 2.5%, as compared to $75.4 million for the same quarter last year. The increase was primarily due to increased unit shipments. The increase was partially offset by the overall manufacturing cost reduction due to improved factory utilization as compared to the same quarter last year. Gross margin increased by 3.8 percentage points to 26.3% for the three months ended September 30, 2017 as compared to 22.5% for the same quarter last year. The increase in gross margin was primarily due to increased average selling prices due to a shift in product mix and higher factory utilization during the three months ended September 30, 2017.

Research and development expenses

	Three Months Ended September 30,
	2017		2016		Change
	(in thousands)				(in thousands)		(in percentage)
Research and development	$	8,325	$	7,019	$	1,306	18.6	%

Research and development expenses were $8.3 million for the three months ended September 30, 2017, an increase of $1.3 million, or 18.6%, as compared to $7.0 million for the same quarter last year. The increase was primarily attributable to a $0.8 million increase in employee compensation and benefit expense mainly due to increased headcount and higher bonus expenses,

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and a $0.5 million increase in product prototyping engineering expense as a result of increased engineering activities in the current quarter.

Selling, general and administrative expenses

	Three Months Ended September 30,
	2017		2016		Change
	(in thousands)				(in thousands)		(in percentage)
Selling, general and administrative	$	14,615	$	11,183	$	3,432	30.7	%

Selling, general and administrative expenses were $14.6 million for the three months ended September 30, 2017, an increase of $3.4 million, or 30.7%, as compared to $11.2 million for the same quarter last year. The increase was primarily attributable to a $2.6 million increase in employee compensation and benefit expenses mainly due to increased headcount and higher bonus expenses, a $0.6 million increase in share-based compensation expense due to increased grant of equity awards, a $0.1 million increase in consulting fees primarily due to increased recruiting costs, as well as a $0.1 million increase in audit and tax consulting fees due to increased consulting activities during the current quarter.

Interest income and others, net

	Three Months Ended September 30,
	2017		2016			Change
	(in thousands)					(in thousands)		(in percentage)
Interest income and other income (loss), net	$	40	$	(49	)	$	89	(181.6	)%

Interest income and others, net was primarily related to interest earned from cash and cash equivalents, as well as foreign exchange gains (losses). The increase in interest income and other loss, net during the three months ended September 30, 2017 as compared to the same quarter last year was primarily due to lower foreign exchange losses as a result of recent appreciation of USD against RMB.

Income tax expense

	Three Months Ended September 30,
	2017		2016		Change
	(in thousands)				(in thousands)		(in percentage)
Income tax expense	$	1,274	$	1,237	$	37	3.0	%

For the three months ended September 30, 2017, we recognized income tax expense of approximately $1.3 million, of which $0.4 million was related to a discrete tax expense for an intercompany asset transfer. For the three months ended September 30, 2016, we recognized income tax expense of $1.2 million. Excluding the discrete income tax expense, the estimated effective tax rate for the three months ended September 30, 2017 was 19.1% compared to 32.9% for the three months ended September 30, 2016. The income tax expense for the three months ended September 30, 2017 was lower than the tax expense for the same quarter last year primarily from changes in the mix of earnings in various geographic jurisdictions between the current quarter and the same quarter of last year.

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Liquidity and Capital Resources

Our principal need for liquidity and capital resources is to maintain sufficient working capital to support our operations and to invest adequate capital expenditures to grow of our business. Currently, we finance our operations and capital expenditures primarily through funds generated from operations.

On August 15, 2017, our Oregon subsidiary, Jireh Semiconductor Incorporated (“Jireh”), entered into a credit agreement with a financial institution (the “Bank”) that provides a term loan in an amount up to $30.0 million for the purpose of purchasing certain equipment for our fabrication facility located in Oregon. The obligation under the credit agreement is secured by substantially all assets of Jireh and guaranteed by the Company. The credit agreement has a five-year term and matures on August 15, 2022, and Jireh may draw down the loan at any time during the first year. After the first year, Jireh is required to pay to the Bank on each payment date, the outstanding principal amount of the loan in monthly installments. The loan accrues interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the credit agreement, plus specified applicable margin based on the outstanding balance of the loan. The credit agreement contains customary restrictive covenants, including certain financial covenants that require the Company to maintain, on a consolidated basis, specified financial ratios and fixed charge coverage ratio. We are in compliance with these covenants. As of September 30, 2017, no amount was drawn under the credit agreement and the total $30.0 million remained available.

In March 2016, we entered into the JV Agreement with an initial capitalization of $330.0 million. By September 30, 2017, the Chongqing Funds contributed a total of $120.0 million of initial capital in cash, and we contributed $10.0 million in cash and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. We expect the JV Company to commence initial production in mid-calendar year 2018. Over the long-term, the JV Company plans to construct and operate a 12-inch wafer fabrication facility for the manufacturing or semiconductor products. If both parties agree that the termination of the JV Company is the best interest of each party or the JV Company is bankrupt or insolvent where either party may terminate early, after paying the debts of the JV Company, the remaining assets of the JV Company shall be paid to the Chongqing Funds to cover the principal of its total paid-in contributions plus the interest at 10% simple annual rate prior to distributing the balance of the JV Company's assets to us.

In January 2017, the JV Company entered into the EPC Contract. The total price payable by the JV Company under the EPC Contract is approximately $78.0 million, which consists of $2.8 million of design fees and $75.2 million of construction and procurement fees. These fees will be paid by the JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones. Assuming all of the specified milestones are achieved in accordance with the construction schedule, the JV Company expects to pay approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively, under the EPC Contract. The actual payments may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately $30.1 million under the EPC Contract.

In September 2017, the Board of Directors terminated our prior repurchase program that was approved in 2015 and approved a new repurchase program (the “Repurchase Program”). The Repurchase Program allows us to repurchase our common shares from the open market pursuant to a pre-established Rule 10b5-1 trading plan or through privately negotiated transactions up to an aggregate of $30.0 million. The amount and timing of any repurchases under the Repurchase Program depend on a number of factors, including but not limited to, the trading price, volume and availability of our common shares. Shares repurchased under this program are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. There is no guarantee that such repurchases under the Purchase Program will enhance the value of our shares.

During the three months ended September 30, 2017, we did not repurchase any shares pursuant to the Repurchase Program or the prior repurchase program. Since the inception of the prior repurchase program in 2010, we repurchased an aggregate of 5,723,093 shares from the open market including shares purchased in the Tender Offer for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses.  As of September 30, 2017, of the 5,723,093 repurchased shares, 120,504 shares with a weighted average repurchase price of $10.73 per share, were reissued at an average price of $6.09 per share pursuant to option exercises and vested restricted share units. We had $30.0 million remained available under the Repurchase Program as of September 30, 2017.

We believe that our current cash and cash equivalents and cash flows from operations will be sufficient to meet our anticipated cash needs, including working capital and capital expenditures, for at least the next twelve months. In the long-term, we may require additional capital due to changing business conditions or other future developments, including any investments or acquisitions we may decide to pursue. If our cash is insufficient to meet our needs, we may seek to raise capital through equity or debt financing. The sale of additional equity securities could result in dilution to our shareholders. The

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incurrence of indebtedness would result in increased debt service obligations and may include operating and financial covenants that would restrict our operations. We cannot be certain that any financing will be available in the amounts we need or on terms acceptable to us, if at all.

Cash and cash equivalents

As of September 30, 2017 and June 30, 2017, we had $180.2 million and $115.7 million of cash and cash equivalents, respectively. Our cash and cash equivalents primarily consist of cash on hand and short-term bank deposits with original maturities of three months or less. Of the $180.2 million and $115.7 million cash and cash equivalents, $141.9 million and $73.9 million, respectively, are deposited with financial institutions outside the United States.

The following table shows our cash flows from operating, investing and financing activities for the periods indicated:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Net cash provided by operating activities	$	12,250		$	9,297
Net cash used in investing activities	(34,821		)	(16,994		)
Net cash provided by financing activities	86,846			38,664
Effect of exchange rate changes on cash and cash equivalents	182			33
Net increase in cash and cash equivalents	$	64,457		$	31,000

Cash flows from operating activities

Net cash provided by operating activities of $12.3 million for the three months ended September 30, 2017 resulted primarily from net income of $3.3 million and non-cash expenses of $9.1 million, offset by net changes in assets and liabilities of $0.2 million. The non-cash expenses of $9.1 million included a $7.0 million of depreciation and amortization expenses and a $2.0 million of share-based compensation expense. The net changes in assets and liabilities of $0.2 million were primarily due to a $2.9 million increase in inventories, a $3.2 million increase in other current and long term assets due to increase in advance payments to vendors, partially offset by a $3.0 million decrease in accounts receivable from timing of billings and collection of payments, a $2.4 million increase in accrued and other liabilities and a $0.7 million increase in income taxes payable.

Net cash provided by operating activities of $9.3 million for the three months ended September 30, 2016 resulted primarily from net income of $2.4 million and non-cash expenses of $14.1 million, offset by net changes in assets and liabilities of $7.2 million. The non-cash expenses of $14.1 million include a $6.5 million of depreciation and amortization expenses, a $1.3 million of share-based compensation expense, a $0.4 million of gain on disposal of property and equipment, and a $6.6 million of deferred income taxes. The net changes in assets and liabilities of $7.2 million were primarily due to a $0.5 million increase in accounts receivable from timing of billings and collection of payments, a $1.2 million increase in inventories, a $5.7 million increase in other current and long term assets due to increase in advance payments to vendors, and a $2.8 million decrease in accounts payable due to timing of payment, partially offset by a $0.3 million increase in income taxes payable and a $2.6 million increase in accrued and other liabilities.

Cash flows from investing activities

Net cash used in investing activities of $34.8 million for the three months ended September 30, 2017 was primarily attributable to $28.3 million purchases of property and equipment, including $21.2 million purchase in the Joint Venture Company, $5.7 million in purchases of intangible asset, and $0.8 million increase in restricted cash during the quarter.

Net cash used in investing activities of $17.0 million for the three months ended September 30, 2016 was primarily attributable to $17.4 million purchases of property and equipment and land to increase our in-house production capacity and to support the Joint Venture Company, partially offset by $0.4 million proceeds from sale of certain equipment.

Cash flows from financing activities

Net cash used in financing activities of $86.8 million for the three months ended September 30, 2017 was primarily attributable to $87.0 million proceeds from investment by noncontrolling interest and $0.2 million of proceeds from exercise of

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stock options, partially offset by $0.2 million in payment of capital lease obligations and $0.1 million in common shares acquired to settle withholding tax related to vesting of restricted stock units.

Net cash used in financing activities of $38.7 million for the three months ended September 30, 2016 was primarily attributable to $33.0 million proceeds from investment by noncontrolling interest and $6.0 million of proceeds from exercise of stock options, partially offset by $0.2 million in payment of capital lease obligations and $0.1 million in common shares acquired to settle withholding tax related to vesting of restricted stock units.

Capital expenditures

Capital expenditures were $28.3 million and $17.4 million for the three months ended September 30, 2017 and 2016, respectively. The increase in capital expenditure was primarily due to EPC construction payment in connection with the JV Transaction, additional purchase of equipment and assets, and investment in R&D to improve our technology and support our new product introductions. In general, our capital expenditures primarily consists of purchases of equipment for our packaging and testing services and for our Oregon fab, purchases of equipment and construction payment in Chongqing for the Joint Venture Company, investment in new technology as well as for upgrading our operational and financial systems. We expect that our capital expenditures will continue to increase in order to support the JV Transaction and to develop products for new markets, including markets for digital multi-phase controller products.

Commitments

See Note 11 of the Notes to the Condensed Consolidated Financial Statements contained in this Quarterly Report on Form 10-Q for a description of commitments.

Off-Balance Sheet Arrangements

As of September 30, 2017, we had no material off-balance sheet arrangements as defined in Regulation S-K 303(a)(4)(ii) arrangements.

Contractual Obligations

There were no material changes outside of our ordinary course of business in our contractual obligations from those disclosed in our Annual Report on Form 10-K for the fiscal year ended June 30, 2017.

Recent Accounting Pronouncements

See Note 1 of the Notes to the Condensed Consolidated Financial Statements contained in this Quarterly Report on Form 10-Q for a description of recent accounting pronouncements, including the expected dates of adoption and estimated effects on results of operations and financial condition, which is incorporated herein by reference.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There have been no material changes in the market risks previously disclosed in Part II, Item 7A, "Quantitative and Qualitative Disclosures About Market Risk," of our Annual Report on Form 10-K for the year ended June 30, 2017, filed with the SEC on September 5, 2017.

ITEM 4. CONTROLS AND PROCEDURES

Management's Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended, (the “Exchange Act”)), as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of September 30, 2017 have been designed and are functioning effectively to provide reasonable assurance that the information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC's rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the three months ended September 30, 2017 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Limitation on Effectiveness of Controls

While our disclosure controls and procedures and internal control over financial reporting are designed to provide reasonable assurance that their respective objectives will be met, we do not expect that our disclosure controls and procedures or our internal control over financial reporting are or will be capable of preventing or detecting all errors and all fraud. Any control system, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that the control system's objectives will be met.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are currently not a party to any material legal proceedings. We have in the past, and may from time to time in the future, become involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, we could incur significant costs in the defense thereof or could suffer adverse effects on its operations.

ITEM 1A. RISK FACTORS

Item 1A of Part I of our Annual Report on Form 10-K for the year ended June 30, 2017, filed with the SEC on September 5, 2017, contains risk factors identified by the Company. There have been no material changes to the risk factors we previously disclosed in our filings with the SEC. Our operations could also be affected by additional factors that are not presently known to us or by factors that we currently consider immaterial to our business.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

In September 2017, the Board of Directors terminated our prior repurchase program that was approved in 2015 and approved a new repurchase program (the “Repurchase Program”), which allows us to repurchase our common shares from the open market pursuant to a pre-established Rule 10b5-1 trading plan or through privately negotiated transactions up to an aggregate of $30.0 million. The amount and timing of any repurchases under the Repurchase Program depend on a number of factors, including but not limited to, the trading price, volume and availability of our common shares. Shares repurchased under this program are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity. There is no guarantee that such repurchases under the Repurchase Program will enhance the value of our shares.

During the three months ended September 30, 2017, we did not repurchase any shares under the Repurchase Program or the prior repurchase program. As of September 30, 2017, $30.0 million remained available under the Repurchase Program.

32

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

Not applicable.

33

ITEM 6. EXHIBITS

31.1	Certification of Chief Executive Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Securities Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation
101.DEF	XBRL Taxonomy Extension Definition
101.LAB	XBRL Taxonomy Extension Labels
101.PRE	XBRL Taxonomy Extension Presentation

34

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

November 9, 2017

ALPHA AND OMEGA SEMICONDUCTOR LIMITED
By:	/s/  YIFAN LIANG
	Yifan Liang
	Chief Financial Officer and Corporate Secretary
	(Principal Financial Officer)

35

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alpha and Omega Semiconductor Limited (the "registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 9, 2017

/s/    Mike F. Chang   

Mike F. Chang

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT TO

SECURITIES EXCHANGE ACT RULES 13a-14(a) and 15d-14(a), AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Alpha and Omega Semiconductor Limited (the "registrant");

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: November 9, 2017

/s/    Yifan Liang

Yifan Liang Chief Financial Officer and Corporate Secretary

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Mike F. Chang, chief executive officer of Alpha and Omega Semiconductor Limited (the "Company"), certify for the purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge,

a. the Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended September 30, 2017 (the "Report"), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

b. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 9, 2017

/s/    Mike F. Chang    

Mike F. Chang

Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Yifan Liang, chief financial officer of Alpha and Omega Semiconductor Limited (the "Company"), certify for the purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge,

a. the Quarterly Report of the Company on Form 10-Q for the fiscal quarter ended September 30, 2017 (the "Report"), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

b. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 9, 2017

/s/    Yifan Liang

Yifan Liang

Chief Financial Officer and Corporate Secretary

XML

Document and Entity Information - shares	3 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	ALPHA & OMEGA SEMICONDUCTOR Ltd
Entity Central Index Key	0001387467
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		23,875,051

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Current assets:
Cash and cash equivalents	$ 180,165	$ 115,708
Restricted cash	1,033	221
Accounts receivable, net	25,406	28,410
Inventories	79,187	76,254
Other current assets	6,415	4,883
Total current assets	292,206	225,476
Property, plant and equipment, net	158,973	139,387
Land use rights, net	8,941	8,804
Deferred income tax assets - long-term	4,568	4,594
Other long term assets	14,891	19,865
Total assets	492,582	398,408
Current liabilities:
Accounts payable	60,140	63,134
Accrued liabilities	37,321	28,386
Income taxes payable	2,393	1,748
Deferred margin	942	814
Capital leases	837	828
Total current liabilities	101,633	94,910
Income taxes payable - long-term	931	922
Deferred income tax liabilities	2,736	2,659
Capital leases - long-term	659	866
Other long term liabilities	462	502
Total liabilities	106,421	99,859
Commitments and contingencies (Note 11)
Preferred shares, par value $0.002 per share:
Authorized: 10,000 shares, issued and outstanding: none at September 30, 2017 and June 30, 2017	0	0
Common shares, par value $0.002 per share:
Authorized: 50,000 shares, issued and outstanding: 29,640 shares and 24,038 shares, respectively at September 30, 2017 and 29,600 shares and 23,992 shares, respectively at June 30, 2017	59	59
Treasury shares at cost, 5,602 shares at September 30, 2017 and 5,608 shares at June 30, 2017	(49,791)	(49,836)
Additional paid-in capital	208,336	206,332
Accumulated other comprehensive income	673	306
Retained earnings	113,238	113,909
Total Alpha and Omega Semiconductor Limited shareholder's equity	272,515	270,770
Noncontrolling interest	113,646	27,779
Total equity	386,161	298,549
Total liabilities and equity	492,582	398,408
Intangible Assets, Net (Including Goodwill)	$ 13,003	$ 282

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2017	Jun. 30, 2017
Common shares, par value (in dollars per share)	$ 0.002	$ 0.002
Common shares, authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	29,640,000	29,600,000
Common stock, shares outstanding (in shares)	24,038,000	23,992,000
Preferred stock, par value (in dollars per share)	$ 0.002	$ 0.002
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury shares (in shares)	5,602,000	5,608,000

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Revenue	$ 104,858	$ 97,362
Cost of goods sold	77,328	75,418
Gross profit	27,530	21,944
Operating expenses
Research and development	8,325	7,019
Selling, general and administrative	14,615	11,183
Total operating expenses	22,940	18,202
Operating income	4,590	3,742
Interest income and other income (loss), net	40	(49)
Interest expense	(17)	(26)
Net income before income taxes	4,613	3,667
Income tax expense	1,274	1,237
Net income including noncontrolling interest	3,339	2,430
Net loss attributable to noncontrolling interest	(1,461)	(877)
Net income attributable to Alpha and Omega Semiconductor Limited	$ 4,800	$ 3,307
Net income per common share attributable to Alpha and Omega Semiconductor Limited
Basic (in dollars per share)	$ 0.20	$ 0.14
Diluted (in dollars per share)	$ 0.19	$ 0.14
Weighted average number of common shares attributable to Alpha and Omega Semiconductor Limited used to compute net income per share
Basic (in shares)	24,021	23,031
Diluted (in shares)	24,960	24,413

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Net income including noncontrolling interest	$ 3,339	$ 2,430
Net income attributable to Alpha and Omega Semiconductor Limited	4,800	3,307
Foreign currency translation adjustment	701	70
Comprehensive income	4,040	2,500
Noncontrolling interest	(1,127)	(898)
Comprehensive income attributable to Alpha and Omega Semiconductor Limited	$ 5,167	$ 3,398

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income including noncontrolling interest	$ 3,339	$ 2,430
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	6,978	6,503
Share-based compensation expense	2,008	1,316
Deferred income taxes, net	103	6,645
(Gain) loss on disposal of property and equipment	11	(377)
Changes in assets and liabilities:
Accounts receivable, net	3,004	(465)
Inventories	(2,932)	(1,170)
Other current and long-term assets	(3,202)	(5,690)
Accounts payable	(70)	(2,804)
Income taxes payable	655	327
Accrued and other liabilities	2,356	2,582
Net cash provided by operating activities	12,250	9,297
Cash flows from investing activities
Purchases of property and equipment excluding JV Company	(7,118)	(5,306)
Purchases of property and equipment in JV Company	(21,171)	(3,331)
Purchases of land use rights in JV Company	0	(8,737)
Payments to acquire intangible assets	(5,720)	0
Proceeds from sale of property and equipment	0	417
Increase in restricted cash	(812)	(37)
Net cash used in investing activities	(34,821)	(16,994)
Cash flows from financing activities
Proceeds from investment by noncontrolling interest	86,994	33,000
Withholding tax on restricted stock units	(129)	(132)
Proceeds from exercise of stock options	179	6,011
Principal payments on capital leases	(198)	(215)
Net cash provided by financing activities	86,846	38,664
Effect of exchange rate changes on cash and cash equivalents	182	33
Net increase in cash and cash equivalents	64,457	31,000
Cash and cash equivalents at beginning of period	115,708	87,774
Cash and cash equivalents at end of period	180,165	118,774
Supplemental disclosures of non-cash investing and financing information:
Property and equipment purchased but not yet paid	23,894	5,226
Re-issuance of treasury stock	$ (9)	$ 10

XML

Intangible assets, net (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 15,387	$ 2,666
Less accumulated amortization	(2,653)	(2,653)
Intangible assets, net	12,700
License fees
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	13,969	1,248
Trade name
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	268	268
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,150	$ 1,150

XML

The Company and Significant Accounting Policies

3 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The Company and Significant Accounting Policies

The Company and Significant Accounting Policies

The Company

Alpha and Omega Semiconductor Limited and its subsidiaries (the “Company,” "AOS," "we" or "us") design, develop and supply a broad range of power semiconductors. The Company's portfolio of products targets high-volume applications, including personal computers, flat panel TVs, LED lighting, smart phones, battery packs, consumer and industrial motor controls and power supplies for TVs, computers, servers and telecommunications equipment. The Company conducts its operations primarily in the United States of America (“USA”), Hong Kong, China, Taiwan, Korea, Germany and Japan.

Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the periods presented have been included in the interim periods. Operating results for the three months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2018. The condensed consolidated balance sheet at June 30, 2017 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China (the "Chongqing Funds") to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contributions from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company. The Company owns 51% and the Chongqing Funds own 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has a controlling financial interest.

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's condensed consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Fair Value of Financial Instruments

The fair values of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

In May 2017, the FASB issued Accounting Standard Updates ("ASU") ASU 2017-09, "Compensation -Stock Compensation: Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 is an update to the existing guidance to clarify when modification accounting would be applied for a change to the terms or conditions of a share-based award. Under this new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award changes as a result of the change in terms or conditions. This ASU will be effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 with early adoption permitted. The Company does not regularly modify the terms and conditions of its share-based awards and does not expect the adoption of this guidance to have a significant impact on its financial statements.

In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows: Restricted Cash ("ASU 2016-18"). ASU 2016-18 requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. This ASU will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted and requires retrospective adoption.  The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). ASU 2016-15 identifies how certain cash receipts and cash payments are presented and classified in the Statement of Cash Flows under Topic 230. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted.  Upon adoption, entities must apply the guidance retrospectively to all periods presented. The Company is currently evaluating the impact the adoption of ASU 2016-15 will have on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. Subsequently, the FASB has issued the following standards related to ASU 2014-09: ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (“ASU 2016-08”); ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”); ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”); and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers (“ASU 2016-20”).  The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standards”). The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). The Company will adopt the new revenue standards in its first quarter of fiscal year 2019 utilizing the modified retrospective method. While the Company is still in the process of completing its analysis on the impact this guidance will have on the Company's consolidated financial statements, related disclosures, and its internal controls over financial reporting, the Company cannot reasonably estimate quantitative information at this time.

XML

Net Income (Loss) Per Share

3 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income Per Common Share Attributable to Alpha and Omega Semiconductor Limited

The following table presents the calculation of basic and diluted net income per share attributable to common shareholders:

	Three Months Ended September 30,
	2017		2016
	(in thousands, except per share data)
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$	4,800	$	3,307
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Diluted:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	939		1,382
Weighted average number of common shares used to compute diluted net income per share	24,960		24,413
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	0.20	$	0.14
Diluted	$	0.19	$	0.14

The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive:

	Three Months Ended September 30,
	2017	2016
	(in thousands)
Employee stock options and RSUs	172	247
ESPP	90	—
Total potential dilutive securities	262	247

XML

Concentration of Credit Risk and Significant Customers

3 Months Ended

Sep. 30, 2017

Risks and Uncertainties [Abstract]

Concentration of Credit Risk and Significant Customers

Concentration of Credit Risk and Significant Customers

The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application and review of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers.

Credit sales, which are mainly on credit terms of 30 to 60 days, are only made to customers who meet the Company's credit requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, when available.

Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts:

	Three Months Ended September 30,
Percentage of revenue	2017		2016
Customer A	27.5	%	24.2	%
Customer B	33.9	%	36.5	%
Customer C	*		13.9	%

* Less than 10%

	September 30, 2017		June 30, 2017
Percentage of accounts receivable
Customer A	31.3	%	33.2	%
Customer B	12.6	%	13.2	%
Customer C	21.0	%	16.4	%

XML

Balance Sheet Components

3 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Balance Sheet Components

Accounts receivable, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Accounts receivable	$	45,742		$	48,039
Less: Allowance for price adjustments	(20,306		)	(19,599		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	25,406		$	28,410

Inventories:

	September 30, 2017		June 30, 2017
	(in thousands)
Raw materials	$	33,717	$	32,118
Work in-process	37,076		36,081
Finished goods	8,394		8,055
	$	79,187	$	76,254

Property, plant and equipment, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land	$	4,877		$	4,877
Building	4,325			4,325
Manufacturing machinery and equipment	230,559			215,275
Equipment and tooling	14,310			13,549
Computer equipment and software	24,804			24,346
Office furniture and equipment	1,856			1,935
Leasehold improvements	29,278			29,136
	310,009			293,443
Less accumulated depreciation	(202,984		)	(194,837		)
	107,025			98,606
Equipment and construction in progress	51,948			40,781
Property, plant and equipment, net	$	158,973		$	139,387

Intangible assets, net:

	September 30, 2017			June 30, 2017
	(in thousands)
License fees	$	13,969		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	15,387			2,666
Less accumulated amortization	(2,653		)	(2,653		)
	12,734			13
Goodwill	269			269
Intangible assets, net	$	13,003		$	282

Land use rights, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land use rights	$	9,032		$	8,849
Less accumulated amortization	(91		)	(45		)
Land use rights, net	$	8,941		$	8,804

Other long-term assets:

	September 30, 2017		June 30, 2017
	(in thousands)
Prepayments for property and equipment	$	11,800	$	12,964
Investment in a privately held company	700		700
Prepaid income tax	—		4,377
Office leases deposits	2,000		1,608
Other	391		216
	$	14,891	$	19,865

Accrued liabilities:

	September 30, 2017		June 30, 2017
	(in thousands)
Accrued compensation and benefits	$	15,090	$	13,727
Warranty accrual	1,622		1,866
Stock rotation accrual	1,994		1,871
Accrued professional fees	1,795		2,500
Accrued inventory	608		410
Accrued facilities related expenses	1,719		1,501
Accrued license fees	7,000		—
Other accrued expenses	7,493		6,511
	$	37,321	$	28,386

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,866		$	1,495
Additions (Reductions)	(237		)	1,491
Utilization	(7		)	(48		)
Ending balance	$	1,622		$	2,938

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,871		$	1,988
Additions	791			1,626
Utilization	(668		)	(1,599		)
Ending balance	$	1,994		$	2,015

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Debt Debt

3 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt

Debt

On August 15, 2017, the Company's Oregon subsidiary, Jireh Semiconductor Incorporated (“Jireh”), entered into a credit agreement with a financial institution (the “Bank”) that provides a term loan in an amount up to $30.0 million for the purpose of purchasing certain equipment for our fabrication facility located in Oregon.  The obligation under the credit agreement is secured by substantially all assets of Jireh and guaranteed by the Company.  The credit agreement has a five-year term and matures on August 15, 2022, and Jireh may draw down the loan at any time during the first year.  After the first year, Jireh is required to pay to the Bank on each payment date, the outstanding principal amount of the loan in monthly installments.  The loan accrues interest based on an adjusted London Interbank Offered Rate ("LIBOR") as defined in the credit agreement, plus specified applicable margin based on the outstanding balance of the loan.  The credit agreement contains customary restrictive covenants and includes certain financial covenants that require the Company to maintain, on a consolidated basis, specified financial ratios and fixed charge coverage ratio. As of September 30, 2017, the Company recorded approximately $0.1 million of transaction costs and had no outstanding balance of the loan.

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Joint Venture

3 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Joint Venture

Joint Venture

On March 29, 2016, the Company entered into a joint venture contract (the “JV Agreement”) with two investment funds owned by the Municipality of Chongqing (the “Chongqing Funds”), pursuant to which the Company and the Chongqing Funds formed a joint venture, (the “JV Company”), for the purpose of constructing and operating a power semiconductor packaging, testing and 12-inch wafer fabrication facility in the Liangjiang New Area of Chongqing, China (the “JV Transaction”). The total initial capitalization of the JV Company is $330.0 million (the “Initial Capitalization”), which includes cash contribution from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company.  The Initial Capitalization is expected to be completed in stages.  The Company owns 51%, and the Chongqing Funds own 49%, of the equity interest in the JV Company. If both parties agree that the termination of the JV Company is the best interest of each party or the JV Company is bankrupt or insolvent where either party may terminate early, after paying the debts of the JV Company, the remaining assets of the JV Company shall be paid to the Chongqing Funds to cover the principal of its total paid-in contributions plus interest at 10% simple annual rate prior to distributing the balance of the JV Company's assets to the Company. The Company expects the JV Company to commence initial production in mid-calendar year 2018.

There is no private land ownership in China. Individuals and companies are permitted to acquire land use rights for specific purpose. In September 2016, the JV Company paid approximately $8.7 million for land use rights to build the manufacturing facility. In March 2017, the JV Company received the necessary land use right certificate from the PRC government. The land use rights will expire on November 30, 2066.

As part of the JV Transaction, the JV Company entered into an Engineering, Procurement and Construction Contract (the “EPC Contract”) with The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited (the “Contractor”), effective as of January 10, 2017 (the "Effective Date"), pursuant which the Contractor was engaged to construct the manufacturing facility contemplated under the JV Agreement. Under the EPC Contract, the Contractor’s obligations include, but are not limited to: (i) the development of conceptual design, initial design, construction drawing design and optimization, and submission of such designs to the JV Company for examination and confirmation; and (ii) the construction of the assembly and wafer fabrication facilities and related procurement services, including the selection and engagement of subcontractors, in accordance with a construction schedule agreed upon by the parties. The total price payable under the EPC Contract is Chinese Renminbi (RMB) 540.0 million, or approximately $78.0 million based on the currency exchange rate between RMB and U.S. Dollars on the Effective Date, which consists of $2.8 million (RMB 19.5 million) of design fees (“Design Fees”) and $75.2 million (RMB 520.5 million) of construction and procurement fees (including compliance with safety and aesthetic requirements) (“Construction Fees”). The Design Fees and Construction Fees will be paid by the JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones, approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively. The payment may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately$30.1 million under the EPC Contract.

The Company began consolidating the financial statements of the JV Company in the quarter ended June 30, 2016. The Chongqing Funds contributed $87.0 million initial capital in cash during the three months ended September 30, 2017. As of September 30, 2017, the Chongqing Funds contributed an aggregate of $120.0 million of initial capital in cash and the Company contributed cash of $10.0 million and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company.

The changes in total stockholders' equity and noncontrolling interest were as follows (in thousands):

	Total AOS Stockholders' Equity			Noncontrolling Interest			Total Equity
Balance, June 30, 2017	$	270,770		$	27,779		$	298,549
Exercise of common stock options and release of RSUs	234			—			234
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	(55		)	—			(55		)
Withholding tax on restricted stock units	(129		)	—			(129		)
Stock-based compensation expense	2,008			—			2,008
Net income (loss)	4,800			(1,461		)	3,339
Deferred tax asset related to ASU 2016-16 adoption	(5,480		)	—			(5,480		)
Cumulative translation adjustment	367			334			701
Contributions from noncontrolling interest	—			86,994			86,994
Balance, September 30, 2017	$	272,515		$	113,646		$	386,161

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Shareholders' Equity and Share-based Compensation

3 Months Ended

Sep. 30, 2017

Share-based Compensation [Abstract]

Shareholders' Equity and Share-based Compensation

Shareholders' Equity and Share-based Compensation

Share Repurchase

In September 2017, the Board of Directors terminated the repurchase program that was previously approved in 2015 and approved a new repurchase program (the “Repurchase Program”), which allows the Company to repurchase its common shares from the open market pursuant to a pre-established Rule 10b5-1 trading plan or through privately negotiated transactions up to an aggregate of $30.0 million. The amount and timing of any repurchases under the Repurchase Program depend on a number of factors, including but not limited to, the trading price, volume and availability of the Company's common shares. Shares repurchased under this program are accounted for as treasury shares and the total cost of shares repurchased is recorded as a reduction of shareholders' equity.

During the three months ended September 30, 2017, the Company did not repurchase any shares pursuant to the Repurchase Program or the prior repurchase program.  Since the inception of the prior repurchase program in 2010, the Company repurchased an aggregate of 5,723,093 shares from the open market including shares purchased in the Tender Offer for a total cost of $50.8 million, at an average price of $8.87 per share, excluding fees and related expenses.  No repurchased shares have been retired. Of the 5,723,093 repurchased shares, 120,504 shares with a weighted average repurchase price of $10.73 per share, were reissued at an average price of $6.09 per share pursuant to option exercises and vested restricted share units. As of September 30, 2017, $30.0 million remained available under the Repurchase Program.

Stock Options

The Company did not grant any stock options during the three months ended September 30, 2017. Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

The following table summarizes the Company's stock option activities for the three months ended September 30, 2017:

					Weighted
			Weighted		Average
			Average		Remaining
	Number of		Exercise Price		Contractual	Aggregate
	Shares		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2017	1,053,367		$	10.98	4.43	$	6,212,660
Granted	—		$	—
Exercised	(18,265	)	$	9.79		$	112,089
Canceled or forfeited	—		$	—
Outstanding at September 30, 2017	1,035,102		$	11.00	4.24	$	5,930,320
Options vested and expected to vest	1,033,779		$	11.00	4.24	$	5,918,653
Exercisable at September 30, 2017	964,685		$	11.25	4.09	$	5,303,664

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2017:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2017	1,144,865		$	14.11	1.76	$	19,084,900
Granted	20,176		$	16.48
Vested	(36,366	)	$	13.98
Forfeited	(9,875	)	$	14.09
Nonvested at September 30, 2017	1,118,800		$	14.16	1.56	$	18,449,012
RSUs vested and expected to vest	1,001,288				1.49	$	16,511,235

The fair value of RSU is based on the market price of the Company's share on the date of grant.

In March 2017, the Company granted 170,000 performance-based RSUs (“PRSUs”) to its key personnel. The number shares to be issued under the PRSU will be determined based on the level of attainment of predetermined financial goals. The PRSU will vest in four equal annual installments from March 15, 2018 if certain predetermined financial goals were met. The Company recorded approximately $0.2 million of expenses for these PRSUs in the three months ended September 30, 2017.

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2017
Volatility rate	44.7%
Risk-free interest rate	1.0% - 1.3%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation Expense

The total share-based compensation expense related to stock options, RSUs and ESPP described above, recognized in the condensed consolidated statements of operations for the periods presented was as follows:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Cost of goods sold	$	316	$	195
Research and development	362		360
Selling, general and administrative	1,330		761
	$	2,008	$	1,316

As of September 30, 2017, total unrecognized compensation cost under the Company's equity plans was $8.2 million, which is expected to be recognized over a weighted-average period of 1.5 years.

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STM License STM License

3 Months Ended

Sep. 30, 2017

STM License [Abstract]

STM License

STMicro License

On September 5, 2017, the Company entered into a license agreement with STMicroelectronics International N.V. (“STMicro”), pursuant to which STMicro granted the Company a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products, which have been offered by STMicro.  This agreement allows the Company to develop and market products in a new market, primarily in the computer server segment. Under the license agreement, the Company agreed to pay a total price in cash of $17.0 million based on the payment schedule of, approximately $10.1 million, $6.7 million and $0.2 million in calendar year 2017, 2018 and 2019, respectively. As of September 30, 2017, the Company recorded $12.7 million in intangible assets, of which $5.6 million was paid to STMicro.

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Income Taxes

3 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

For the three months ended September 30, 2017, the Company recognized income tax expense of approximately $1.3 million, of which $0.4 million was related to a discrete tax expense for an intercompany asset transfer. For the three months ended September 30, 2016, the Company recognized income tax expense of approximately $1.2 million. Excluding the discrete income tax expense, the estimated effective tax rate for the three months ended September 30, 2017 was 19.1% compared to 32.9% for the three months ended September 30, 2016. The changes in the effective tax rate and tax expense between the periods resulted primarily from changes in the mix of earnings in various geographic jurisdictions between the current quarter and the same period of last year.

During the quarter ended September 30, 2016, the Company contributed certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. As a result of the transfer, the Company reduced its deferred tax assets by $6.6 million and recorded a $6.6 million in prepaid tax asset, which was amortized to tax expense over the useful life of the assets. As of June 30, 2017, the prepaid tax asset was amortized down to $5.5 million, of which $1.1 million and $4.4 million were included in prepaid and other current assets and other long-term assets on the Company's balance sheet, respectively. On July 1, 2017, the Company adopted ASU 2016-16, Intra-Entity Transfers of Assets other than Inventory, which resulted in a de-recognition of a prepaid tax asset of $5.5 million related to the prior period intra-entity asset transfer with the JV Company, with an offsetting reduction to retained earnings.  Because the JV Company has a full valuation allowance, there was no change to the Company’s net deferred tax assets.

The Company files its income tax returns in the United States and in various foreign jurisdictions. The tax years 2001 to 2017 remain open to examination by U.S. federal and state tax authorities. The tax years 2010 to 2017 remain open to examination by foreign tax authorities.

The Company's income tax returns are subject to examinations by the Internal Revenue Service and other tax authorities in various jurisdictions. In accordance with the guidance on the accounting for uncertainty in income taxes, the Company regularly assesses the likelihood of adverse outcomes resulting from these examinations to determine the adequacy of its provision for income taxes. These assessments can require considerable estimates and judgments. As of September 30, 2017, the gross amount of unrecognized tax benefits was approximately $6.7 million, of which $4.1 million, if recognized, would reduce the effective income tax rate in future periods. If the Company's estimate of income tax liabilities proves to be less than the ultimate assessment, then a further charge to expense would be required. If events occur and the payment of these amounts ultimately proves to be unnecessary, the reversal of the liabilities would result in tax benefits being recognized in the period when the Company determines the liabilities are no longer necessary. The Company does not anticipate any material changes to its uncertain tax positions during the next twelve months.

On July 27, 2015, in Altera Corp. v. Commissioner, the U.S. Tax Court issued an opinion related to the treatment of share-based compensation expense in an intercompany cost-sharing arrangement. A final decision has yet to be issued by the Tax Court due to other outstanding issues related to the case. At this time, the U.S. Department of the Treasury has not withdrawn the requirement to include share-based compensation from its regulations. Due to the uncertainty surrounding the status of the current regulations, questions related to the scope of potential benefits, and the risk of the Tax Court’s decision being overturned upon appeal, the Company has not recorded any benefit as of September 30, 2017. The Company will continue to monitor ongoing developments and potential impacts to its financial statements.

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Segment and Geographic Information

3 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Segment and Geographic Information

Segment and Geographic Information

The Company is organized as, and operates in, one operating segment: the design, development and supply of power semiconductor products for computing, consumer electronics, communication and industrial applications. The chief operating decision-maker is the Chief Executive Officer. The financial information presented to the Company's Chief Executive Officer is on a consolidated basis, accompanied by information about revenue by customer and geographic region, for purposes of evaluating financial performance and allocating resources. The Company has one business segment, and there are no segment managers who are held accountable for operations, operating results and plans for products or components below the consolidated unit level. Accordingly, the Company reports as a single operating segment.

The Company sells its products primarily to distributors in the Asia Pacific region, who in turn sell these products to end customers. Because the Company's distributors sell their products to end customers which may have a global presence, revenue by geographical location is not necessarily representative of the geographical distribution of sales to end user markets.

The revenue by geographical location in the following tables is based on the country or region to which the products were shipped to:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Hong Kong	$	85,230	$	82,835
China	17,120		12,442
South Korea	287		366
United States	1,378		894
Other Countries	843		825
	$	104,858	$	97,362

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Power discrete	$	83,678	$	71,428
Power IC	18,097		22,998
Packaging and testing services	3,083		2,936
	$	104,858	$	97,362

Long-lived assets, net consisting of property, plant and equipment and land use rights, by geographical area are as follows:

	September 30, 2017		June 30, 2017
	(in thousands)
China	$	103,187	$	85,691
United States	64,014		61,787
Other Countries	713		713
	$	167,914	$	148,191

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Commitments and Contingencies

3 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Purchase Commitments

As of September 30, 2017 and June 30, 2017, the Company had approximately $38.7 million and $25.7 million, respectively, of outstanding purchase commitments primarily for purchases of semiconductor raw materials, wafers, spare parts and packaging and testing services, and approximately $65.5 million and $69.2 million, respectively, of capital commitments for the purchase of property and equipment.

Joint Venture

In March 2016, the Company executed an agreement with two strategic investment funds owned by the Municipality of Chongqing, China to form a joint venture for a new state-of-the-art power semiconductor packaging, testing and wafer fabrication facility in Liangjiang New Area of Chongqing (the "Joint Venture"). The initial capitalization of the Joint Venture under the agreement is $330.0 million, which includes cash contribution from the Chongqing Funds and contributions of cash, equipment and intangible assets from the Company. The Company owns 51% and the Chongqing Funds own 49% of the equity interest of the Joint Venture. The Joint Venture is accounted under the provisions of the consolidation guidance since the Company has controlling financial interest.

As of September 30, 2017, the Chongqing Funds contributed an aggregate of $120.0 million of initial capital in cash and the Company contributed $10.0 million in cash and certain intangible assets, as well as certain packaging equipment as required by the JV Agreement by transferring the legal titles of such equipment to the JV Company. The Company expects the JV Company to commence initial production in mid-calendar year 2018.

In January 2017, the JV Company entered into an Engineering, Procurement and Construction Contract (the "EPC Contract") with The IT Electronics Eleventh Design & Research Institute Scientific and Technological Engineering Corporation Limited. The total price payable by the JV Company under the EPC Contract is approximately $78.0 million, which consists of $2.8 million of design fees and $75.2 million of construction and procurement fees. These fees will be paid by the JV Company pursuant to a payment schedule based on the progress of the construction and the achievements of specified milestones, approximately $58.3 million and $19.7 million in calendar year 2017 and 2018, respectively. The payment may be subject to volatility as a result of exposure to fluctuations in RMB foreign exchange rates. As of September 30, 2017, the JV Company paid approximately $30.1 million under the EPC Contract.

STMicro License

On September 5, 2017, the Company entered into a license agreement with STMicroelectronics International N.V. (“STMicro”), pursuant to which STMicro granted the Company a world-wide, royalty-free and fully-paid license to use its technologies to develop, market and distribute certain digital multi-phase controller products, which have been offered by STMicro.  Under the license agreement, the Company agreed to pay a total price in cash of $17.0 million based on the payment schedule of, approximately $10.1 million, $6.7 million and $0.2 million in calendar year 2017, 2018 and 2019, respectively. As of September 30, 2017, the Company recorded $12.7 million in intangible assets, of which $5.6 million was paid to STMicro.

Contingencies and Indemnities

The Company is currently not a party to any pending material legal proceedings. The Company has in the past, and may from time to time in the future, become involved in legal proceedings arising from the normal course of business activities.  The semiconductor industry is characterized by frequent claims and litigation, including claims regarding patent and other intellectual property rights as well as improper hiring practices. Irrespective of the validity of such claims, the Company could incur significant costs in the defense of such claims and suffer adverse effects on its operations.

The Company is a party to a variety of agreements that it has contracted with various third parties. Pursuant to these agreements, the Company may be obligated to indemnify another party to such an agreement with respect to certain matters. Typically, these obligations arise in the context of contracts entered into by the Company, under which the Company customarily agrees to hold the other party harmless against losses arising from a breach of representations and covenants related to such matters as title to assets sold, certain intellectual property rights, specified environmental matters and certain income taxes. In these circumstances, payment by the Company is customarily conditioned on the other party making a claim pursuant to the procedures specified in the particular contract, which procedures typically allow the Company to challenge the other party's claim. Further, the Company's obligations under these agreements may be limited in time and/or amount, and in some instances, the Company may have recourse against third parties for certain payments made by it under these agreements. The Company has not historically paid or recorded any material indemnifications and no accrual has been made at September 30, 2017 and June 30, 2017.

The Company has agreed to indemnify its directors and certain employees as permitted by law and pursuant to its bye-laws, and has entered into indemnification agreements with its directors and executive officers. The Company has not recorded a liability associated with these indemnification arrangements, as it historically has not incurred any material costs associated with such indemnification obligations. Costs associated with such indemnification obligations may be mitigated by insurance coverage that the Company maintains. However, such insurance may not cover any, or may cover only a portion of, the amounts the Company may be required to pay. In addition, the Company may not be able to maintain such insurance coverage in the future.

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The Company and Significant Accounting Policies (Policies)

3 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Preparation

Basis of Preparation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to Article 10 of Securities and Exchange Commission Regulation S-X, as amended. They do not include all information and footnotes necessary for a fair presentation of financial position, results of operations and cash flows in conformity with U.S. GAAP for complete financial statements. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017. All significant intercompany balances and transactions have been eliminated in consolidation. In the opinion of management, all adjustments (consisting of normal recurring adjustments and accruals) considered necessary for a fair presentation of the results of operations for the periods presented have been included in the interim periods. Operating results for the three months ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending June 30, 2018. The condensed consolidated balance sheet at June 30, 2017 is derived from the audited financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended June 30, 2017.

Use of Estimates

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with U.S. GAAP requires the Company to make estimates, judgments and assumptions that affect the reported amounts of assets, liabilities, revenue and expenses. To the extent there are material differences between these estimates and actual results, the Company's condensed consolidated financial statements will be affected. On an ongoing basis, the Company evaluates the estimates, judgments and assumptions including those related to stock rotation returns, price adjustments, allowance for doubtful accounts, inventory reserves, warranty accrual, income taxes, share-based compensation, and useful lives for property, plant and equipment and intangible assets.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The fair values of cash equivalents are based on observable market prices and have been categorized in Level 1 in the fair value hierarchy. Cash equivalents consist primarily of short term bank deposits. The carrying values of financial instruments such as cash and cash equivalents, accounts receivable and accounts payable approximate their carrying values due to their short-term maturities.

Comprehensive Income (Loss)

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions and other events and circumstances from non-owner sources. The Company's accumulated other comprehensive income (loss) consists of cumulative foreign currency translation adjustments. Total comprehensive income (loss) is presented in the condensed consolidated statements of comprehensive income (loss).

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2017, the FASB issued Accounting Standard Updates ("ASU") ASU 2017-09, "Compensation -Stock Compensation: Scope of Modification Accounting ("ASU 2017-09"). ASU 2017-09 is an update to the existing guidance to clarify when modification accounting would be applied for a change to the terms or conditions of a share-based award. Under this new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award changes as a result of the change in terms or conditions. This ASU will be effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2017 with early adoption permitted. The Company does not regularly modify the terms and conditions of its share-based awards and does not expect the adoption of this guidance to have a significant impact on its financial statements.

In November 2016, the FASB issued ASU 2016-18, "Statement of Cash Flows: Restricted Cash ("ASU 2016-18"). ASU 2016-18 requires amounts generally described as restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the total beginning and ending amounts for the periods shown on the statement of cash flows. This ASU will be effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted and requires retrospective adoption.  The Company does not expect the adoption of this guidance will have a material impact on its consolidated financial position, results of operations or cash flows.

In August 2016, the FASB issued ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15"). ASU 2016-15 identifies how certain cash receipts and cash payments are presented and classified in the Statement of Cash Flows under Topic 230. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years, with early adoption permitted.  Upon adoption, entities must apply the guidance retrospectively to all periods presented. The Company is currently evaluating the impact the adoption of ASU 2016-15 will have on its consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases. This guidance requires a dual approach for lessee accounting under which a lessee will account for leases as finance leases or operating leases. Both finance and operating leases will result in the lessee recognizing a right-of-use asset and a corresponding liability on its balance sheet, with differing methodology for income statement recognition. This guidance is effective for public business entities for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. A modified retrospective approach is required for all leases existing or entered into after the beginning of the earliest comparative period in the consolidated financial statements. The Company is currently assessing the impact that adoption of this guidance will have on its consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers. The standard provides companies with a single model for use in accounting for revenue arising from contracts with customers and supersedes current revenue recognition guidance, including industry-specific revenue guidance. The core principle of the model is to recognize revenue when control of the goods or services transfers to the customer, as opposed to recognizing revenue when the risks and rewards transfer to the customer under the existing revenue guidance. Subsequently, the FASB has issued the following standards related to ASU 2014-09: ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (“ASU 2016-08”); ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing (“ASU 2016-10”); ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients (“ASU 2016-12”); and ASU No. 2016-20, Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers (“ASU 2016-20”).  The Company must adopt ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20 with ASU 2014-09 (collectively, the “new revenue standards”). The new standard permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). The Company will adopt the new revenue standards in its first quarter of fiscal year 2019 utilizing the modified retrospective method. While the Company is still in the process of completing its analysis on the impact this guidance will have on the Company's consolidated financial statements, related disclosures, and its internal controls over financial reporting, the Company cannot reasonably estimate quantitative information at this time.

Concentration of Credit Risk

The Company manages its credit risk associated with exposure to distributors and direct customers on outstanding accounts receivable through the application and review of credit approvals, credit ratings and other monitoring procedures. In some instances, the Company also obtains letters of credit from certain customers.

Credit sales, which are mainly on credit terms of 30 to 60 days, are only made to customers who meet the Company's credit requirements, while sales to new customers or customers with low credit ratings are usually made on an advance payment basis. The Company considers its trade accounts receivable to be of good credit quality because its key distributors and direct customers have long-standing business relationships with the Company and the Company has not experienced any significant write-offs of accounts receivable in the past. The Company closely monitors the aging of accounts receivable from its distributors and direct customers, and regularly reviews their financial positions, when available.

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Net Income (Loss) Per Share (Tables)

3 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted net income per share attributable to common shareholders:

	Three Months Ended September 30,
	2017		2016
	(in thousands, except per share data)
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$	4,800	$	3,307
Denominator:
Basic:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Diluted:
Weighted average number of common shares used to compute basic net income per share	24,021		23,031
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	939		1,382
Weighted average number of common shares used to compute diluted net income per share	24,960		24,413
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic	$	0.20	$	0.14
Diluted	$	0.19	$	0.14

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potential dilutive securities were excluded from the computation of diluted net income per share as their effect would have been anti-dilutive:

	Three Months Ended September 30,
	2017	2016
	(in thousands)
Employee stock options and RSUs	172	247
ESPP	90	—
Total potential dilutive securities	262	247

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Concentration of Credit Risk and Significant Customers (Tables)

3 Months Ended

Sep. 30, 2017

Risks and Uncertainties [Abstract]

Schedules of Concentration of Risk, by Risk Factor

Summarized below are individual customers whose revenue or accounts receivable balances were more than 10% of the respective total consolidated amounts:

	Three Months Ended September 30,
Percentage of revenue	2017		2016
Customer A	27.5	%	24.2	%
Customer B	33.9	%	36.5	%
Customer C	*		13.9	%

* Less than 10%

	September 30, 2017		June 30, 2017
Percentage of accounts receivable
Customer A	31.3	%	33.2	%
Customer B	12.6	%	13.2	%
Customer C	21.0	%	16.4	%

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Balance Sheet Components (Tables)

3 Months Ended

Sep. 30, 2017

Balance Sheet Related Disclosures [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Accounts receivable	$	45,742		$	48,039
Less: Allowance for price adjustments	(20,306		)	(19,599		)
Less: Allowance for doubtful accounts	(30		)	(30		)
Accounts receivable, net	$	25,406		$	28,410

Schedule of Inventory, Current

Inventories:

	September 30, 2017		June 30, 2017
	(in thousands)
Raw materials	$	33,717	$	32,118
Work in-process	37,076		36,081
Finished goods	8,394		8,055
	$	79,187	$	76,254

Property, Plant and Equipment

Property, plant and equipment, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land	$	4,877		$	4,877
Building	4,325			4,325
Manufacturing machinery and equipment	230,559			215,275
Equipment and tooling	14,310			13,549
Computer equipment and software	24,804			24,346
Office furniture and equipment	1,856			1,935
Leasehold improvements	29,278			29,136
	310,009			293,443
Less accumulated depreciation	(202,984		)	(194,837		)
	107,025			98,606
Equipment and construction in progress	51,948			40,781
Property, plant and equipment, net	$	158,973		$	139,387

Intangible Assets Disclosure

Intangible assets, net:

	September 30, 2017			June 30, 2017
	(in thousands)
License fees	$	13,969		$	1,248
Trade name	268			268
Customer relationships	1,150			1,150
	15,387			2,666
Less accumulated amortization	(2,653		)	(2,653		)
	12,734			13
Goodwill	269			269
Intangible assets, net	$	13,003		$	282

Summary of Land Use Rights, Net

Land use rights, net:

	September 30, 2017			June 30, 2017
	(in thousands)
Land use rights	$	9,032		$	8,849
Less accumulated amortization	(91		)	(45		)
Land use rights, net	$	8,941		$	8,804

Schedule of Other Assets, Noncurrent

Other long-term assets:

	September 30, 2017		June 30, 2017
	(in thousands)
Prepayments for property and equipment	$	11,800	$	12,964
Investment in a privately held company	700		700
Prepaid income tax	—		4,377
Office leases deposits	2,000		1,608
Other	391		216
	$	14,891	$	19,865

Schedule of Accrued Liabilities

Accrued liabilities:

	September 30, 2017		June 30, 2017
	(in thousands)
Accrued compensation and benefits	$	15,090	$	13,727
Warranty accrual	1,622		1,866
Stock rotation accrual	1,994		1,871
Accrued professional fees	1,795		2,500
Accrued inventory	608		410
Accrued facilities related expenses	1,719		1,501
Accrued license fees	7,000		—
Other accrued expenses	7,493		6,511
	$	37,321	$	28,386

Schedule of Product Warranty Liability

The activities in the warranty accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,866		$	1,495
Additions (Reductions)	(237		)	1,491
Utilization	(7		)	(48		)
Ending balance	$	1,622		$	2,938

Stock Rotation Accrual

The activities in the stock rotation accrual, included in accrued liabilities, are as follows:

	Three Months Ended September 30,
	2017			2016
	(in thousands)
Beginning balance	$	1,871		$	1,988
Additions	791			1,626
Utilization	(668		)	(1,599		)
Ending balance	$	1,994		$	2,015

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Joint Venture (Tables)

3 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Schedule of Stockholders Equity

The changes in total stockholders' equity and noncontrolling interest were as follows (in thousands):

	Total AOS Stockholders' Equity			Noncontrolling Interest			Total Equity
Balance, June 30, 2017	$	270,770		$	27,779		$	298,549
Exercise of common stock options and release of RSUs	234			—			234
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	(55		)	—			(55		)
Withholding tax on restricted stock units	(129		)	—			(129		)
Stock-based compensation expense	2,008			—			2,008
Net income (loss)	4,800			(1,461		)	3,339
Deferred tax asset related to ASU 2016-16 adoption	(5,480		)	—			(5,480		)
Cumulative translation adjustment	367			334			701
Contributions from noncontrolling interest	—			86,994			86,994
Balance, September 30, 2017	$	272,515		$	113,646		$	386,161

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Shareholders' Equity and Share-based Compensation (Tables)

3 Months Ended

Sep. 30, 2017

Share-based Compensation [Abstract]

Summary of Stock Option Activities

Stock Options

The Company did not grant any stock options during the three months ended September 30, 2017. Options expected to vest are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

The following table summarizes the Company's stock option activities for the three months ended September 30, 2017:

					Weighted
			Weighted		Average
			Average		Remaining
	Number of		Exercise Price		Contractual	Aggregate
	Shares		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2017	1,053,367		$	10.98	4.43	$	6,212,660
Granted	—		$	—
Exercised	(18,265	)	$	9.79		$	112,089
Canceled or forfeited	—		$	—
Outstanding at September 30, 2017	1,035,102		$	11.00	4.24	$	5,930,320
Options vested and expected to vest	1,033,779		$	11.00	4.24	$	5,918,653
Exercisable at September 30, 2017	964,685		$	11.25	4.09	$	5,303,664

Restricted Stock Units Activity

Restricted Stock Units ("RSU")

The following table summarizes the Company's RSU activities for the three months ended September 30, 2017:

	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2017	1,144,865		$	14.11	1.76	$	19,084,900
Granted	20,176		$	16.48
Vested	(36,366	)	$	13.98
Forfeited	(9,875	)	$	14.09
Nonvested at September 30, 2017	1,118,800		$	14.16	1.56	$	18,449,012
RSUs vested and expected to vest	1,001,288				1.49	$	16,511,235

The fair value of RSU is based on the market price of the Company's share on the date of grant.

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:

	Three Months Ended September 30,
	2017
Volatility rate	44.7%
Risk-free interest rate	1.0% - 1.3%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation, Allocation of Recognized Period Costs

Share-based Compensation Expense

The total share-based compensation expense related to stock options, RSUs and ESPP described above, recognized in the condensed consolidated statements of operations for the periods presented was as follows:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Cost of goods sold	$	316	$	195
Research and development	362		360
Selling, general and administrative	1,330		761
	$	2,008	$	1,316

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Segment and Geographic Information (Tables)

3 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Long-lived assets, net consisting of property, plant and equipment and land use rights, by geographical area are as follows:

	September 30, 2017		June 30, 2017
	(in thousands)
China	$	103,187	$	85,691
United States	64,014		61,787
Other Countries	713		713
	$	167,914	$	148,191

The revenue by geographical location in the following tables is based on the country or region to which the products were shipped to:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Hong Kong	$	85,230	$	82,835
China	17,120		12,442
South Korea	287		366
United States	1,378		894
Other Countries	843		825
	$	104,858	$	97,362

Revenue from External Customers by Products and Services

The following is a summary of revenue by product type:

	Three Months Ended September 30,
	2017		2016
	(in thousands)
Power discrete	$	83,678	$	71,428
Power IC	18,097		22,998
Packaging and testing services	3,083		2,936
	$	104,858	$	97,362

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The Company and Significant Accounting Policies Joint Venture (Details) - Facility in Liangjiang New Area of Chongqing (the 'Joint Venture') - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2016	Mar. 29, 2016
Parent Company
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	51.00%
Chongqing Funds
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	49.00%
Corporate Joint Venture
Initial capitalization of joint venture		$ 330.0

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Net Income (Loss) Per Share - Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$ 4,800	$ 3,307
Basic:
Weighted average number of common shares used to compute basic net income per share	24,021	23,031
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	939	1,382
Weighted average number of common shares used to compute diluted net income per share	24,960	24,413
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic (in dollars per share)	$ 0.20	$ 0.14
Diluted (in dollars per share)	$ 0.19	$ 0.14

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Net Income (Loss) Per Share - Potential Dilutive Shares (Details) - shares shares in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	262	247
Employee stock options and RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	172	247
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potential dilutive securities (in shares)	90	0

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Concentration of Credit Risk and Significant Customers - (Details)		3 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016
Minimum
Concentration Risk
Terms of credit sales, (in days)		30 days
Maximum
Concentration Risk
Terms of credit sales, (in days)		60 days
Customer A | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		27.50%		24.20%
Customer A | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		31.30%	33.20%
Customer B | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		33.90%		36.50%
Customer B | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		12.60%	13.20%
Customer C | Sales Revenue, Goods, Net | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total	[1]			13.90%
Customer C | Accounts Receivable | Customer Concentration Risk
Concentration Risk
Customers greater than 10% of total		21.00%	16.40%

[1] * Less than 10%

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Balance Sheet Components - Accounts receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Accounts receivable	$ 45,742	$ 48,039
Less: Allowance for price adjustments	(20,306)	(19,599)
Less: Allowance for doubtful accounts	(30)	(30)
Accounts receivable, net	$ 25,406	$ 28,410

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Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Raw materials	$ 33,717	$ 32,118
Work in-process	37,076	36,081
Finished goods	8,394	8,055
Inventory, net	$ 79,187	$ 76,254

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Balance Sheet Components - Property, plant, and equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 310,009	$ 293,443
Less accumulated depreciation	(202,984)	(194,837)
Property, plant and equipment excluding equipment and construction in progress, net	107,025	98,606
Equipment and construction in progress	51,948	40,781
Property, plant and equipment, net	158,973	139,387
Land
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,877	4,877
Building
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	4,325	4,325
Manufacturing machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	230,559	215,275
Equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	14,310	13,549
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	24,804	24,346
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	1,856	1,935
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment excluding equipment and construction In progress, gross	$ 29,278	$ 29,136

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Balance Sheet Components - Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 15,387	$ 2,666
Less accumulated amortization	(2,653)	(2,653)
Intangible Assets, Net (Excluding Goodwill)	12,734	13
Goodwill	269	269
Intangible assets, net	13,003	282
License fees
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	13,969	1,248
Trade name
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	268	268
Customer relationships
Schedule of Finite-lived Intangible Assets and Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 1,150	$ 1,150

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Balance Sheet Components - Land Use Rights, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Land use rights	$ 9,032	$ 8,849
Less: Accumulated depreciation	(91)	(45)
Land use rights, net	$ 8,941	$ 8,804

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Balance Sheet Components - Other long term assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Balance Sheet Related Disclosures [Abstract]
Prepayments for property and equipment	$ 11,800	$ 12,964
Investment in a privately held company	700	700
Prepaid income tax	0	4,377
Office leases deposits	2,000	1,608
Other	391	216
Other long-term assets	$ 14,891	$ 19,865

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Balance Sheet Components - Accrued liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Accrued compensation and benefit	$ 15,090	$ 13,727
Warranty accrual	1,622	1,866	$ 2,938	$ 1,495
Stock rotation accrual	1,994	1,871	$ 2,015	$ 1,988
Accrued professional fees	1,795	2,500
Accrued inventory	608	410
Accrued facilities related expenses	1,719	1,501
Accrued STMicro license fees	7,000	0
Other accrued expenses	7,493	6,511
Accrued liabilities	$ 37,321	$ 28,386

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Balance Sheet Components - Product Warranty Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Beginning balance	$ 1,866	$ 1,495
Additions (Reductions)	(237)	(1,491)
Utilization	(7)	(48)
Ending balance	$ 1,622	$ 2,938

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Balance Sheet Components - Stock Rotation Accrual (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Stock Rotation Accrual Increae (Decrease) [Roll Forward]
Beginning balance	$ 1,871	$ 1,988
Additions	791	1,626
Utilization	(668)	(1,599)
Ending balance	$ 1,994	$ 2,015

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Debt (Details) - Term Loan - Secured Debt - Variable Interest Rate Term Loan Maturing August 2022 - USD ($)	Sep. 30, 2017	Aug. 15, 2017
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 30,000,000
Transaction costs	$ 100,000
Outstanding loan balance	$ 0

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Joint Venture - Narrative (Details)	1 Months Ended		3 Months Ended		9 Months Ended	15 Months Ended
	Sep. 30, 2016 USD ($)	Mar. 31, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jan. 10, 2017 CNY (¥)	Jan. 10, 2017 USD ($)	Mar. 29, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Purchases of land use rights in JV Company			$ 0	$ (8,737,000)
Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Schedule of Equity Method Investments [Line Items]
Interest rate to concontrolling interest if joint venture is early terminated and liquidated		10.00%
Consideration transferred to acquire interest in joint venture			10,000,000
Parent Company | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Schedule of Equity Method Investments [Line Items]
Percent ownership in joint venture		51.00%
Chongqing Funds | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Schedule of Equity Method Investments [Line Items]
Percent ownership in joint venture		49.00%
Payments to acquire interest in joint venture			$ 87,000,000			$ 120,000,000
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Total price payable under EPC Contract							¥ 540,000,000	$ 78,000,000
Contract amount payable in calendar year 2017								58,300,000
Contract amount payable in calendar year 2018								19,700,000
Contractual Obligation, Payment					$ 30,100,000
Corporate Joint Venture | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Schedule of Equity Method Investments [Line Items]
Initial capitalization of joint venture									$ 330,000,000
Purchases of land use rights in JV Company	$ 8,700,000
Corporate Joint Venture | Design Fees
Schedule of Equity Method Investments [Line Items]
Total price payable under EPC Contract							19,525,052	2,800,000
Corporate Joint Venture | Construction and Procurement Fees
Schedule of Equity Method Investments [Line Items]
Total price payable under EPC Contract							¥ 520,474,948	$ 75,200,000

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Joint Venture - Changes in Total Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Balance, June 30, 2017	$ 298,549
Exercise of common stock options and release of RSUs	234
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	(55)
Withholding tax on restricted stock units	(129)
Stock-based compensation expense	2,008
Net income (loss)	3,339	$ 2,430
Net loss attributable to noncontrolling interest	(1,461)	(877)
Cumulative translation adjustment	701
Proceeds from investment by noncontrolling interest	86,994	$ 33,000
Balance, September 30, 2017	386,161
Accounting Standards Update 2016-16
Schedule of Equity Method Investments [Line Items]
Deferred tax asset related to ASU 2016-16 adoption	(5,480)
Parent
Schedule of Equity Method Investments [Line Items]
Balance, June 30, 2017	270,770
Exercise of common stock options and release of RSUs	234
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	(55)
Withholding tax on restricted stock units	(129)
Stock-based compensation expense	2,008
Net income (loss)	4,800
Cumulative translation adjustment	367
Proceeds from investment by noncontrolling interest	0
Balance, September 30, 2017	272,515
Parent | Accounting Standards Update 2016-16
Schedule of Equity Method Investments [Line Items]
Deferred tax asset related to ASU 2016-16 adoption	(5,480)
Noncontrolling Interest
Schedule of Equity Method Investments [Line Items]
Balance, June 30, 2017	27,779
Exercise of common stock options and release of RSUs	0
Reissuance of treasury stock upon exercise of common stock options and release of RSUs	0
Withholding tax on restricted stock units	0
Stock-based compensation expense	0
Net loss attributable to noncontrolling interest	(1,461)
Cumulative translation adjustment	334
Proceeds from investment by noncontrolling interest	86,994
Balance, September 30, 2017	113,646
Noncontrolling Interest | Accounting Standards Update 2016-16
Schedule of Equity Method Investments [Line Items]
Deferred tax asset related to ASU 2016-16 adoption	$ 0

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Shareholders' Equity and Share-based Compensation - Shares Repurchase (Details) $ / shares in Units, $ in Millions	3 Months Ended	83 Months Ended
	Sep. 30, 2017 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares
Class of Stock [Line Items]
Share repurchase program, authorized amount (USD in Millions) | $	$ 30.0	$ 30.0
Shares Repurchase Program Remaining Balance | $	$ 30.0	$ 30.0
Treasury Stock, Shares, Acquired | shares	0	5,723,093
Treasury Stock, Value, Acquired, Cost Method | $		$ 50.8
Treasury stock acquired, average price per share (in dollars per share) | $ / shares		$ 8.87
Treasury Stock, Shares, Retired | shares		0
Treasury Stock Reissued, Average Price Per Share | $ / shares		$ 6.09
Treasury Stock Reissued
Class of Stock [Line Items]
Treasury stock acquired, average price per share (in dollars per share) | $ / shares		$ 10.73
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures (in shares) | shares		120,504

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Shareholders' Equity and Share-based Compensation - Share-based Compensation (Details) - USD ($)	3 Months Ended		83 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	0		5,723,093
Options, Weighted-Average Remaining Contractual Life (in years)	4 years 2 months 27 days	4 years 5 months 5 days
Options vested and expected to vest, Number Outstanding (in shares)	1,033,779		1,033,779
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 11.00		$ 11.00
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	4 years 2 months 27 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 5,918,653		$ 5,918,653
Options, Number Exercisable (in shares)	964,685		964,685
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 11.25		$ 11.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 2 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 5,303,664		$ 5,303,664
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at June 30, 2017	1,053,367
Granted (in shares)	0
Exercised (in shares)	(18,265)
Canceled or forfeited (in shares)	0
Outstanding at September 30, 2017	1,035,102	1,053,367	1,035,102
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at June 30, 2016 (in dollars per share)	$ 10.98
Granted (in dollars per share)	0
Exercised (in dollars per share)	9.79
Canceled or forfeited (in dollars per share)	0.00
Outstanding at March 31, 2017 (in dollars per share)	$ 11.00	$ 10.98	$ 11.00
Options Outstanding Aggregate Intrinsic Value	$ 5,930,320	$ 6,212,660	$ 5,930,320
Options Exercised Aggregate Intrinsic Value	$ 112,089
Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility Rate	44.70%
Expected Term	1 year 3 months 18 days
Expected Dividend Rate	0.00%
Employee Share Purchase Plan [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	1.00%
Employee Share Purchase Plan [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate	1.30%

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Shareholders' Equity and Share-based Compensation - Stock Options Outstanding and Exercisable (Details) - $ / shares	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017
Share-based Compensation [Abstract]
Options, Number Outstanding (in shares)	1,035,102	1,053,367
Options, Weighted-Average Remaining Contractual Life (in years)	4 years 2 months 27 days	4 years 5 months 5 days
Options, Weighted-Average Exercise Price (in dollars per share)	$ 11.00	$ 10.98
Options, Number Exercisable (in shares)	964,685
Options, Weighted-Average Exercise Price (in dollars per share)	$ 11.25
Options vested and expected to vest, Number Outstanding (in shares)	1,033,779
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)	4 years 2 months 27 days
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 11.00

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Shareholders' Equity and Share-based Compensation - Restricted Stock Activity (Details) - USD ($)	3 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted Average Remaining Recognition Period (Years)	1 year 6 months
Allocated share-based compensation expense	$ 2,008,000			$ 1,316,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at June 30, 2017	1,144,865
Granted	20,176
Vested	(36,366)
Forfeited	(9,875)
Nonvested at September 30, 2017	1,118,800	1,144,865
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at June 30, 2017	$ 14.11
Granted	16.48
Vested	13.98
Forfeited	14.09
Nonvested at September 30, 2017	$ 14.16	$ 14.11
Weighted Average Remaining Recognition Period (Years)	1 year 6 months 22 days	1 year 9 months 4 days
RSUs Nonvested Aggregate Intrinsic Value	$ 18,449,012	$ 19,084,900
RSUs vested and expected to vest, Outstanding (in shares)	1,001,288
RSUs vested and expected to vest, Weighted Average Remaining Recognition Period (in years)	1 year 5 months 27 days
RSUs vested and expected to vest, Aggregate Intrinsic Value	$ 16,511,235
Performance Based Restricted Stock Units (PRSUs) Member [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Granted			170,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Allocated share-based compensation expense	$ 200,000

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Shareholders' Equity and Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 2,008	$ 1,316
Unrecognized compensation expense	$ 8,200
Recognition period of share-based compensation expense (in years)	1 year 6 months
Cost of goods sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 316	195
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	362	360
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated share-based compensation expense	$ 1,330	$ 761

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STM License (Details) - USD ($) $ in Thousands		3 Months Ended
	Sep. 05, 2017	Sep. 30, 2017	Sep. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets		$ 5,720	$ 0
Finite-lived intangible assets, net		12,700
STMicro | License fees
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to acquire intangible assets	$ 17,000
Payments to acquire intangible assets, remainder of calendar year	10,100
Payments to acquire intangible assets, calendar year two	6,700
Payments to acquire intangible assets, calendar year three	$ 200
Finite-lived intangible assets, net		$ 5,600

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Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Jul. 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Operating Loss Carryforwards [Line Items]
Income tax expense		$ 1,274	$ 1,237
Discrete income tax expense (benefit)		$ 400
Estimated effective income tax rate excluding discrete income tax expense		19.10%	32.90%
Decrease in deferred tax assets			$ 6,600
Prepaid taxes				$ 5,500
Increase (decrease) in prepaid taxes			$ (6,600)
Unrecognized tax benefits		$ 6,700
Unrecognized tax benefit that would impact effective tax rate		$ 4,100
Prepaid Expenses and Other Current Assets
Operating Loss Carryforwards [Line Items]
Prepaid taxes				1,100
Other Long-term Assets
Operating Loss Carryforwards [Line Items]
Prepaid taxes				$ 4,400
Accounting Standards Update 2016-16
Operating Loss Carryforwards [Line Items]
Increase (decrease) in prepaid taxes	$ 5,500

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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 104,858	$ 97,362
Power discrete
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	83,678	71,428
Power IC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	18,097	22,998
Packaging and testing services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,083	2,936
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	85,230	82,835
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	17,120	12,442
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	287	366
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	1,378	894
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 843	$ 825

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Segment and Geographic Information - Long-lived Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	$ 167,914	$ 148,191
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	103,187	85,691
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	64,014	61,787
Other Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net and land use rights, net	$ 713	$ 713

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Segment and Geographic Information - Narratives (Details)	3 Months Ended
	Sep. 30, 2017 Segment
Segment Reporting [Abstract]
Number of operating segments	1
Number of reportable segments	1

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Commitments and Contingencies - Purchase Commitments (Details) - USD ($)		3 Months Ended
	Sep. 05, 2017	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017
Purchase Commitment, Excluding Long-term Committment [Line Items]
Payments to acquire intangible assets		$ 5,720,000	$ 0
Intangible assets		12,700,000
Raw materials, wafers, and packaging and testing services puchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount		38,700,000		$ 25,700,000
Property and equipment purchase commitments
Purchase Commitment, Excluding Long-term Committment [Line Items]
Purchase commitment, amount		65,500,000		69,200,000
License fees | STMicro
Purchase Commitment, Excluding Long-term Committment [Line Items]
Payments to acquire intangible assets	$ 17,000,000
Payments to acquire intangible assets, remainder of calendar year	10,100,000
Payments to acquire intangible assets, calendar year two	6,700,000
Payments to acquire intangible assets, calendar year three	$ 200,000
Intangible assets		5,600,000
Indemnification Agreement
Purchase Commitment, Excluding Long-term Committment [Line Items]
Indemnifications accrual		$ 0		$ 0

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Commitments and Contingencies - Guarantees (Details) - USD ($)	Sep. 30, 2017	Jun. 30, 2017
Indemnification Agreement
Loss Contingencies [Line Items]
Indemnifications accrual	$ 0	$ 0

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Commitments and Contingencies - Other Investments (Details)	1 Months Ended	3 Months Ended	9 Months Ended	15 Months Ended
	Mar. 31, 2016	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jan. 10, 2017 CNY (¥)	Jan. 10, 2017 USD ($)	Mar. 29, 2016 USD ($)
Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Consideration transferred to acquire interest in joint venture		$ 10,000,000
Parent Company | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	51.00%
Chongqing Funds | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	49.00%
Payments to acquire interest in joint venture		87,000,000		$ 120,000,000
Corporate Joint Venture
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contractual Obligation, Payment			$ 30,100,000
Total price payable under EPC Contract						¥ 540,000,000	$ 78,000,000
Contractual Obligation, Future Minimum Payments Due, Remainder of Calendar Year							58,300,000
Contractual Obligation, Due in Second Calendar Year							19,700,000
Corporate Joint Venture | Facility in Liangjiang New Area of Chongqing (the 'Joint Venture')
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Initial capitalization of joint venture								$ 330,000,000
Corporate Joint Venture | Design Fees
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total price payable under EPC Contract						19,525,052	2,800,000
Corporate Joint Venture | Construction and Procurement Fees
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Total price payable under EPC Contract						¥ 520,474,948	$ 75,200,000
Indemnification Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Indemnifications accrual		$ 0	$ 0	$ 0	$ 0