10-Q/A

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q/A

(Amendment No. 1)

(Mark One)

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

For the quarterly period ended September 30, 2013

OR

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

For the transition period from              to             

Commission File Number: 001-36064

MONTAGE TECHNOLOGY GROUP LIMITED

(Exact name of Registrant as specified in its Charter)

Cayman	Not applicable
(State or other jurisdiction of incorporation)	(I.R.S. Employer Identification Number)

Room A1601, Technology Building, 900 Yi Shan Road

Xuhui District, Shanghai, 200233

People’s Republic of China

(Address of registrant’s principal executive offices, including zip code)

Tel: (86 21) 6128-5678

(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  ¨

Indicate by checkmark 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 during the preceding 12 months (or for such shorter time period that the registrant was required to submit and post such files).    Yes  x    No  ¨

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

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

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

The number of ordinary shares, $0.0125 par value, of the Registrant, outstanding as of November 8, 2013 was 26,476,143 shares.

EXPLANATORY NOTE

The sole purpose of this amendment to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013, originally filed with the Securities and Exchange Commission on November 12, 2013, is to furnish Exhibit 101 to the Form 10-Q, which contains the XBRL (eXtensible Business Reporting Language) Interactive Data File for the condensed consolidated financial statements and notes included in Part I, Item I of the Form 10-Q. As permitted by Rule 405(a)(2)(ii) of Regulation S-T, Exhibit 101 was required to be furnished by amendment within 30 days of the original filing date of the Form 10-Q.

No other changes have been made to the Form 10-Q, and the Form 10-Q has not been updated to reflect events occurring subsequent to the original filing date.

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.

Montage Technology Group Limited

/s/ Mark Voll

Mark Voll

Chief Financial Officer

Date: December 11, 2013

INDEX TO EXHIBITS

Exhibit Number		Incorporated by Reference
	Exhibit Description	Form	File No.	Exhibit	Filing Date	Filed Herewith
3.1	Amended and Restated Memorandum and Articles of Association of the Registrant	S-1	333-190761	3.2	September 11, 2013
4.1	Amended and Restated Investor Rights Agreement dated as of October 8, 2009 and amendment thereto dated as of August 13, 2013	S-1	333-190761	4.2	August 21, 2013
10.1	Montage Technology Group Limited 2006 Share Incentive Plan and related form share option agreement	S-1	333-190761	10.1	August 21, 2013
10.2	Montage Technology Group Limited 2013 Performance Incentive Plan and related form share option agreements	S-1	333-190761	10.2	August 21, 2013
31.1†	Certification of Chief Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2†	Certification of Chief Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934 as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1#†	Certificate of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)
32.2#†	Certificate of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)
101.INS*	XBRL Instance Document					X
101.SCH*	XBRL Taxonomy Extension Schema Document					X
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document					X
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document					X
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document					X
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document					X

† Previously included as an exhibit to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2013 with the Securities and Exchange Commission on November 12, 2013.

# The material contained in Exhibit 32.1 and Exhibit 32.2 is not deemed “filed” with the SEC and is not to be incorporated by reference into any filing of the Company under the Securities Act of 1933 or the Securities Exchange Act of 1934, whether made before or after the date hereof and irrespective of any general incorporation language contained in such filing, except to the extent that the registrant specifically incorporates it by reference.

* XBRL (Extensible Business Reporting Language) information is furnished and not filed or a part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

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Commitments and Contingencies - Summary of Future Minimum Lease Payment under Noncancelable Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Commitments And Contingencies Disclosure [Abstract]
Total contractual obligations	$ 4,131
Total contractual obligations, Less than 1 Year	1,985
Total contractual obligations, 1 - 3 Years	1,877
Total contractual obligations, 3 - 5 Years	269
Purchase obligations, Total	1,670
Purchase obligations, Less than 1 Year	1,670
Operating lease obligations, Total	2,461
Operating lease obligations, Less than 1 Year	315
Operating lease obligations, 1 - 3 Years	1,877
Operating lease obligations, 3 - 5 Years	$ 269

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2.5-for-1 Reverse Share Split - Additional Information (Detail) (USD $)	0 Months Ended
	Sep. 06, 2013	Sep. 30, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Reverse share split	2.5-for-1
Ordinary shares, par value	$ 0.0125	$ 0.0125	$ 0.0125
Preferred shares, par value	$ 0.0125
Before Reverse Share Split [Member]
Class of Stock [Line Items]
Ordinary shares, par value	$ 0.005
Preferred shares, par value	$ 0.005

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Share-Based Compensation

9 Months Ended

Sep. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

12. Share-Based Compensation

The Company’s 2006 Share Incentive Plan (“the 2006 Plan”) was adopted in June 2006. The 2006 Plan provides for the issuance of incentive share options (ISOs), nonstatutory share options (NSOs) and restricted share awards (RSAs). NSOs may be granted to employee, directors and consultants, while ISOs may be granted only to employees and RSAs may be granted to employees, directors or non-employees. Share options granted vest over a maximum period of four years and expire ten years from the date of the grant. Share options generally vest over four years, one-quarter on the first anniversary of the date of the grant and monthly thereafter for the remaining three years. RSAs have various vesting periods determined by the plan administrator, and generally vest over four years, with 25% on each of the anniversary of the vesting commence date. As of September 30, 2013 and December 31, 2012, the number of ordinary shares authorized for equity award issuance under the 2006 Plan was 6,566,544, and 6,566,544 shares, respectively.

The Company’s board of directors has approved and adopted a 2013 Performance Incentive Plan, or the 2013 Plan, in connection with the initial public offering. The Company’s shareholders have approved the 2013 Plan, which has become effective upon the completion of the initial public offering. A total of 1,600,000 ordinary shares will be authorized for issuance with respect to awards granted under the 2013 Plan. The share limit will automatically increase on the first trading day in January of each year (commencing with January 2014) by an amount equal to the lesser of (1) 4% of the total number of outstanding shares of our ordinary shares on the last trading day in December in the prior year, (2) 1,000,000 shares, or such lesser number as determined by our board of directors.

Awards under the 2013 Plan may be in the form of incentive or nonqualified share options, share appreciation rights, share bonuses, restricted share and other forms of awards including cash awards. Awards under the plan generally will not be transferable other than by will or the laws of descent and distribution, except that the plan administrator may authorize certain transfers.

Nonqualified and incentive share options may not be granted at prices below the fair market value of the ordinary shares on the date of grant. Incentive share options must have an exercise price that is at least equal to the fair market value of our ordinary shares, or 110% of fair market value of our ordinary shares or incentive share option grants to any 10% owner of our ordinary shares, on the date of grant. These and other awards may also be issued solely or in part for services. Awards are generally paid in cash or shares of our ordinary shares. The plan administrator may provide for the deferred payment of awards and may determine the terms applicable to deferrals.

The 2013 Plan will terminate on the tenth anniversary of the date our board adopts it. However, the plan administrator will retain its authority until all outstanding awards are exercised or terminated. The maximum term of options, share appreciation rights and other rights to acquire ordinary shares under the plan is ten years after the initial date of the award.

Employees, officers, directors and consultants that provide services to the Company or one of the Company’s subsidiaries may be selected to receive awards under the 2013 Plan and the compensation committee of the Company’s board of directors will be the administrator under the 2013 Plan. Awards under the 2013 Plan may be in the form of incentive or nonqualified share options, share appreciation rights, share bonuses, restricted share and other forms of awards including cash awards.

Share Options

The Company uses the Black-Scholes valuation model to calculate the fair value of share options. The fair value of share options granted to employees is estimated as of the grant date. The fair value of the share options granted to non-employees is re-measured at each reporting date. The assumptions used in valuation were as follows:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2013	2012	2013	2012
Risk-free interest rate	2.52%-3.53%	1.10-2.61%	1.11-3.53%	1.10-3.13%
Expected term (in years)	6 to 10	6 to 10	6 to 10	6 to 10
Dividend yield	—	—	—	—
Volatility	48.04%-49.75%	43.81%-50.40%	39.69%-49.75%	43.81%-52.66%

The risk-free interest rate assumption was based on the yield-to-maturity of the government bond with the longest maturity in the respective countries in which the Company operates.

The assumed dividend yield was based on the Company’s expectation of not paying dividends in the foreseeable future.

The expected term was estimated based on the date of the grant, expiration date and vesting period as stated in the share option grant. The expected term was 6 years for employees and, for subsequent re-measurement of options granted to non-employee consultants, the expected term is calculated based on the remaining life of options of originally 10 years.

Due to the Company’s limited historical data, the estimated volatility incorporated the historical volatility of comparable companies whose share prices are publicly available.

Early Exercise of Employee Share Options

Certain share options granted under the Company’s Plan provide option holders the right to elect to exercise unvested options in exchange for restricted ordinary shares. Restricted shares, which amounted to 7,500 shares and 0 shares as of September 30, 2013 and December 30, 2012, respectively, are subject to a repurchase right held by the Company at the lower of (a) the fair market value of the restricted ordinary shares at the time of the termination, or (b) the original purchase price of the restricted ordinary shares, upon termination of the holder’s status as an employee or consultant. For exercises of employee options, this right usually lapses 25% on the first anniversary of the vesting start date and in 36 equal monthly amounts thereafter. These repurchase terms are considered to be a forfeiture provision and do not result in variable accounting. In accordance with authoritative guidance, the cash received from option holders for the exercise of unvested options is treated as a refundable deposit shown as a liability in the Company’s unaudited condensed consolidated financial statements. As of September 30, 2013 and December 31, 2012 cash received for early exercise of options totaled $8 and $0, respectively.

Total fair value for share options vested during the nine months ended September 30, 2013 was $1,100.

The total compensation cost related to all unvested share option grants not yet recognized as of September 30, 2013 was $13,091 and the weighted-average period over which these grants are expected to vest is 3.69 years.

Share Options to Employees and Consultants

The following table summarizes the details related to stock options granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
Balance at December 31, 2012		2,734,688	$	2.40
Granted		1,330,760		17.68
Exercised		263,667		0.30
Forfeited		26,019		10.64
Canceled		4,669		0.99
Outstanding at September 30, 2013		3,771,093	$	7.89		7.00	$	28,412
Exercisable at September 30, 2013		3,146,996	$	7.21		6.61	$	25,571
Vested at September 30, 2013		1,883,245	$	1.34		4.74	$	24,225
Vested and expected to vest at September 30, 2013		3,611,003	$	7.54		6.89	$	28,202

The Company recognized share-based compensation expense for options as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Operating Expenses
Cost of net revenue	$	15	$	5	$	30	$	15
Research and development		316		137		715		347
Sales, general and administrative		552		151		1,213		320

The following table summarizes information about share options outstanding as of September 30, 2013:

							Share Options
	Share Options Outstanding						Exercisable
Range of Exercise Prices	Shares Outstanding		Weighted Average Remaining Contractual Term (in years)		Weighted Average Exercise Price		Shares Exercisable		Weighted Average Exercise Price
$0.13 - $0.25		789,600		2.75	$	0.13		789,600	$	0.13
$0.40 - $1.03		758,480		5.24		0.96		735,166		0.96
$2.20 - $9.43		897,253		8.44		6.11		581,830		6.08
$16.03 - $17.85		1,325,760		9.56		17.68		1,040,400		17.64
		3,771,093		7.00	$	7.89		3,146,996	$	7.21

Restricted Share Awards

On April 23, 2013, the Company granted 317,120 restricted shares with non-forfeitable dividend right under the Company’s 2006 Share Incentive Plan and these restricted shares are entitled to cash dividends with respect to the Restricted Shares subject to the award even though such shares are not vested. Therefore, pursuant to ASC 260-10-45-61A, these restricted shares are participating securities and related unvested restricted shares are included in the computation of basic net income per share under the two-class method.

The following table summarizes the details related to RSAs, granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:

				Weighted-Average
	Number			Grant Date Fair
	of Shares			Value Per Share
Balance at December 31, 2012		—		$	—
Granted		330,620			17.98
Vested		—			—
Forfeited		8,200			17.98
Outstanding at September 30, 2013		322,420	(*)	$	17.98

(*) The restricted shares are not included in the outstanding ordinary shares due to their restrictions.

The estimated fair value on the grant date of RSAs was $17.98 per share and the share-based compensation expense related to these awards is calculated based on the estimated fair value of the Company’s ordinary shares on the date of grant, multiplied by the number of RSAs granted. The share-based compensation expense, less the forfeitures, is recorded on a straight-line basis over the requisite service period of the RSAs. As of September 30, 2013, there was $4,698 of unrecognized compensation costs, net of forfeitures related to RSAs granted under the Company’s 2006 Share Incentive Plan. The unrecognized compensation cost is expected to be recognized over a weighted average period of 3.97 years.

In connection with the grant of the RSAs to all participants, the Company recorded share-based compensation of $504 for the nine months ended September 30, 2013.

The Company recognized share-based compensation expense for RSAs as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Operating Expenses
Cost of net revenue	$	19	$	—	$	32	$	—
Research and development		230		—		409		—
Sales, general and administrative		36		—		63		—

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Property and Equipment, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Property Plant And Equipment [Abstract]
Depreciation expense	$ 310	$ 207	$ 929	$ 482

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Condensed Consolidated Statement of Operations and Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Revenue	$ 30,056	$ 20,601	$ 75,448	$ 54,538
Cost of revenues:	(10,907)	(7,683)	(27,496)	(21,374)
Gross profit	19,149	12,918	47,952	33,164
Operating expenses:
Research and development	(6,623)	(3,835)	(19,096)	(12,304)
Sales, general and administrative	(3,880)	(2,382)	(10,681)	(5,614)
Total operating expenses	(10,503)	(6,217)	(29,777)	(17,918)
Income from operations	8,646	6,701	18,175	15,246
Interest income, net	202	71	504	75
Other income (expense), net	(70)	20	(157)	253
Income before income tax expenses	8,778	6,792	18,522	15,574
Provision for income tax	(737)	(427)	(1,709)	(980)
Net income	8,041	6,365	16,813	14,594
Other comprehensive income
Cumulative translation adjustments	130	(36)	337	(93)
Comprehensive income	8,171	6,329	17,150	14,501
Accretion for Series B-2 convertible preferred shares		(14)	(23)	(42)
Allocation to participating preferred shares and restricted shares	(6,460)	(5,194)	(13,651)	(12,038)
Net income attributable to ordinary shareholders-Basic	1,581	1,157	3,139	2,514
Undistributed earnings re-allocated to ordinary shareholders	455	397	926	847
Net income attributable to ordinary shareholders-Diluted	$ 2,036	$ 1,554	$ 4,065	$ 3,361
Net income per share:
Basic	$ 0.34	$ 0.27	$ 0.68	$ 0.58
Diluted	$ 0.31	$ 0.24	$ 0.62	$ 0.53
Weighted-average shares used in computing net income per share:
Basic	4,658,034	4,321,144	4,618,302	4,303,135
Diluted	6,527,371	6,391,252	6,557,368	6,295,066

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Prepaid Expenses and Other Current Assets

9 Months Ended

Sep. 30, 2013

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Prepaid Expenses and Other Current Assets

5. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	As of September 30, 2013		As of December 31, 2012
Value-added tax recoverable	$	603	$	486
Prepaid license fees		141		294
Prepayment for material purchase		173		170
Rental deposits		400		321
Value-added tax refundable on export sales		489		306
Other prepaid expenses and other current assets		785		423
	$	2,591	$	2,000

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Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares

19. Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares

The Series A, B, B-1 and B-2 convertible preferred shares automatically converted into ordinary shares based on the then effective conversion ratio immediately upon the closing of Qualified IPO on October 1, 2013. As the IPO was consummated after the September 30, 2013 date of these financial statements, the pro forma balance sheet as of September 30, 2013 assumes the Qualified IPO had occurred and presents an as adjusted financial position as if the conversion of the Series A, B, B-1 and B-2 convertible preferred shares into ordinary shares occurred on September 30, 2013 at the then conversion ratio of 1 for 1 (Series A, Series B issue on December 20, 2007 and Series B-2), 1 for 1.0173 (Series B issued on June 19, 2006) and 1 for 1.040 (Series B-1). Accordingly, the carrying value of the convertible preferred shares, in the amount of $54,400 was reclassified from Convertible Preferred Shares to ordinary shares and additional paid in capital for such pro forma presentation.

The unaudited pro-forma income per share for the three months and the nine months ended September 30, 2013 after giving effect to the conversion of the Series A, B, B-1 and B-2 Preferred Shares into ordinary shares as if the closing occurred at the beginning of fiscal 2013 was as follows:

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2013		September 30, 2013
Numerator:
Actual net income attributable to ordinary shareholders	$	1,581	$	3,139
Pro-forma effect of preferred shares		6,460		13,674
Pro-form net income attributable to ordinary shareholders – Basic and diluted		8,041		16,813
Denominator:
Actual weighted average number of ordinary shares outstanding
Basic		4,658,034		4,618,302
Diluted		6,527,371		6,557,368
Pro-forma effect of preferred shares		16,163,598		16,163,598
Denominator for pro-forma basic and diluted calculation
Basic		20,821,632		20,781,900
Diluted		22,690,969		22,720,966
Pro-forma basic and diluted net income per share attributable to ordinary shareholders
Basic	$	0.39	$	0.81
Diluted	$	0.35	$	0.74

Certain equity awards are not included in the calculation of pro-forma diluted net income per share because of their anti-dilutive effect.

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Share-Based Compensation - Assumptions Used in Valuation of Fair Value of Share Options Granted (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	2.52%	1.10%	1.11%	1.10%
Risk-free interest rate, maximum	3.53%	2.61%	3.53%	3.13%
Dividend yield
Volatility, minimum	48.04%	43.81%	39.69%	43.81%
Volatility, maximum	49.75%	50.40%	49.75%	52.66%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 years	6 years	6 years	6 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	10 years	10 years	10 years	10 years

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Acquired Intangible Assets, Net - Summary of Acquired Intangible Assets, Net (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended			0 Months Ended		1 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Aug. 23, 2012	Aug. 23, 2012 Assembled Workforce [Member]	Aug. 23, 2012 Intellectual Property [Member]	May 31, 2013 Montage Macao License [Member]
Acquired Intangible Assets [Line Items]
Consideration for assets acquired			$ 2,016
Cash consideration for intangible assets				1,900	0
Cash consideration for computers and office equipment			116
Research and development workforce, amortization period				18 months
Cash consideration for intangible assets	$ 484	$ 950				$ 129

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Income Taxes

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

13. Income Taxes

The Company adopted ASC 740-270 approach for interim period tax computation and reporting. The Company recorded an income tax provision of $737, $427, $1,709 and $980 for the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, respectively.

The effective tax rate for the three and nine months ended September 30, 2013 was 8.4% and 9.2%, respectively, and 6.3% and 6.3% in the comparable periods of 2012, respectively. The difference between the effective tax rates and the statutory rate resulted primarily due to the foreign rate differential. The tax rate increase was mainly due to the increase in the total income before tax and the increase in income before tax in the jurisdictions with higher tax rates compared to the prior year as a result of the implementation of the new international structure.

During the three and nine months ended September 30, 2013, the gross amount of the Company’s unrecognized tax benefits did not have a significant increase or decrease because there has been no change in tax positions taken during the current year. Substantially all of the unrecognized tax benefits as of September 30, 2013, $6.9 million, if recognized, would affect the Company’s effective tax rate. As of September 30, 2013, the Company does not expect any significant increases or decreases to its unrecognized tax benefits within the next 12 months.

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Fair Market Value of Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value Disclosures [Abstract]
Change in fair value of short-term investments	$ 182	$ 43	$ 344	$ 63

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Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Earnings Per Share Pro Forma [Line Items]
Conversion of preferred shares	Conversion ratio of 1 for 1 (Series A, Series B issue on December 20, 2007 and Series B-2), 1 for 1.0173 (Series B issued on June 19, 2006) and 1 for 1.040 (Series B-1).
Convertible Preferred Shares [Member]
Earnings Per Share Pro Forma [Line Items]
Carrying value of the convertible preferred shares	$ 54,400

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Short-Term Loans - Additional Information (Detail)	Dec. 31, 2012
Debt Disclosure [Abstract]
Short-term bank loans outstanding, weighted average interest rate per annum	5.88%

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Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Summary of Company's Revenue by Geographic Region

The following table sets forth the Company’s revenue by geographic region:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Hong Kong	$	27,618	$	18,421	$	68,404	$	50,002
Asia Pacific		960		912		2,782		1,236
United States		785		1,008		2,655		2,644
Europe		693		260		1,607		656
	$	30,056	$	20,601	$	75,448	$	54,538

Summary of Company's Revenue Generated from Sales of Semiconductors Solutions

The following table sets forth the Company’s revenue generated from sales of semiconductors solutions for the home entertainment and cloud computing markets:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Home entertainment	$	27,255	$	18,649	$	68,371	$	50,614
Cloud Computing market		2,801		1,952		7,077		3,924
	$	30,056	$	20,601	$	75,448	$	54,538

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Organization and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Summary of Percentage of Revenue and Accounts Receivable Represented by Distributors and Customers

The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
Revenue	2012			2013			2012			2013
Company A		58	%		73	%		43	%		71	%
Company B		13	%		9	%		21	%		8	%

Accounts receivable	December 31, 2012			September 30, 2013
Company A		89	%		79	%

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Organization and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Organization

a. Organization

Montage Technology Group Limited (the “Company”) was incorporated as an international business company with limited liability under International Business Companies Act, 1984 of the British Virgin Islands on March 29, 2004 and continued to, and registered in the Cayman Islands as an exempted company on April 24, 2006. The Company conducts business in several territories including China, Hong Kong, Taiwan and the United States through its wholly owned subsidiaries.

The Company is a global fabless provider of analog and mixed signal semiconductor solutions currently addressing the home entertainment and cloud computing markets. The foundation of its technology platform is the Company’s ability to design high performance, low power semiconductors by using its proprietary building blocks which include radio frequency and analog front end solutions, digital signal processors and high speed interfaces. In the home entertainment market, the Company’s technology platform enables it to design highly integrated solutions with customized software for set-top boxes. The Company’s solutions optimize signal processing performance under demanding operating conditions typically found in emerging market environments. In the cloud computing market, the Company offers high performance, low power memory interface solutions that enable memory intensive server applications.

Initial Public Offering

b. Initial Public Offering

On October 1, 2013, the Company completed an initial public offering (the “Offering”) of 8,165,000 shares of ordinary shares at a price of $10.00 per share, including 5,325,000 additional ordinary shares issued by the Company and 2,840,000 shares sold by existing shareholders. Accordingly, the Company received net proceeds of $49.5 million from the issuance of the ordinary shares in the offering after deducting underwriting discounts and commissions of $3.7 million and excluding other offering expenses of approximately $3.2 million.

Upon completion of the initial public offering on October 1, 2013, the Series A, B, B1 and B2 Convertible Preferred Shares automatically converted into 16,163,598 ordinary shares and the related carrying amount were reclassified as additional paid-in capital. As these transactions occurred after September 30, 2013, they are not reflected in the unaudited condensed consolidated financial statements as of and for the three month period ended September 30, 2013. See Note 19 for discussion of the unaudited pro forma information.

Basis of Presentation

c. Basis of Presentation

The unaudited condensed consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany transactions have been eliminated upon consolidation. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Securities and Exchange Commission (“SEC”), Form 10-Q and Article 10 of SEC Regulation S-X.

The unaudited condensed consolidated financial statements contain all normal recurring accruals and adjustments that, in the opinion of management, are necessary to state fairly the Company’s unaudited consolidated financial position at September 30, 2013 and 2012. The results of operations for the nine months ended September 30, 2013 are not necessarily indicative of the results to be expected for future quarters or the full year.

These unaudited interim condensed financial statements do not include all of the information and footnotes required by US GAAP for complete financial statements. Therefore, these unaudited interim condensed financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related footnotes for the year ended December 31, 2012, included in the Company’s prospectus filed with the SEC in September 2013 (“Company Prospectus”).

All share-related disclosures, including par value, share price, number of ordinary shares, preferred shares, share options, restricted shares, warrants, exercise prices of share options, restricted shares, related fair value per share, and net income per share calculations, have been recast to reflect the 2.5-for-1 reverse share split (See Note 17) for all periods presented.

Use of Estimates

d. Use of Estimates

The preparation of the interim condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of net revenue and expenses during the reporting period. Actual results could differ from those estimates. Significant accounting estimates reflected in the Company’s consolidated financial statements mainly include share-based compensation, allowance for doubtful accounts, inventory write-down, allowance for deferred tax assets, provision for uncertain tax positions, and estimated useful lives of equipment and intangible assets.

Significant Accounting Policies

e. Significant Accounting Policies

There has been no material change to the Company’s significant accounting policies disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Company Prospectus filed with the SEC in September 2013.

Recent Accounting Pronouncements

f. Recent Accounting Pronouncements

There has been no material change to Recent Accounting Pronouncements from those disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Prospectus filed with the SEC in September 2013.

Concentration of Credit Risks

g. Concentration of Credit Risks

Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable.

As of September 30, 2013, substantially all of the Company’s cash and cash equivalents and short-term investments were held by reputable financial institutions in the jurisdictions where the Company and its subsidiaries are located. The Company believes that it is not exposed to unusual risks as these financial institutions have high credit quality. The Company has not experienced any losses on its deposits of cash and cash equivalents, and short-term investments.

The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
Revenue	2012			2013			2012			2013
Company A		58	%		73	%		43	%		71	%
Company B		13	%		9	%		21	%		8	%

Accounts receivable	December 31, 2012			September 30, 2013
Company A		89	%		79	%

The Company establishes credit limits for each distributor and customer and reviews such limits prior to product shipment. The Company did not experience significant credit loss from its distributors and customers during the periods presented.

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Net Income Per Share - Schedule of Equity Awards not Included In Calculation of Diluted Net Income Per Share (Detail) (Equity awards outstanding [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Equity awards outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation of diluted net income per share	1,768,960	403,520	1,726,480	417,120

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Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2013

Payables And Accruals [Abstract]

Schedule of Accrued Liabilities

Accrued liabilities consist of the following:

	As of September 30, 2013		As of December 31, 2012
Government funding for research and development projects (1)	$	3,893	$	3,055
Accrued employee compensation and other employee expenses		3,504		4,505
Accrued research and development expenses		—		28
Advances from customers		267		230
Accrued warranty		187		149
Accrued professional service fee		3,484		497
Proceeds received for early exercised options		8		—
Other accrued liabilities		598		644
	$	11,941	$	9,108

(1) For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded nil, $1,025, $396, and $1,025 government funding as a deduction to expense, respectively. The Company has not recorded any reduction to the carrying value of depreciable assets. As of December 31, 2012 and September 30, 2013, the Company has recorded an accrued liability for cash funding received from the PRC government of $3,055, and $3,893, respectively, because the government had not commenced its review of the research and development projects qualified for funding at the end of the respective periods.

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Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Schedule of Unaudited Pro-Forma Income per Share

The unaudited pro-forma income per share for the three months and the nine months ended September 30, 2013 after giving effect to the conversion of the Series A, B, B-1 and B-2 Preferred Shares into ordinary shares as if the closing occurred at the beginning of fiscal 2013 was as follows:

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2013		September 30, 2013
Numerator:
Actual net income attributable to ordinary shareholders	$	1,581	$	3,139
Pro-forma effect of preferred shares		6,460		13,674
Pro-form net income attributable to ordinary shareholders – Basic and diluted		8,041		16,813
Denominator:
Actual weighted average number of ordinary shares outstanding
Basic		4,658,034		4,618,302
Diluted		6,527,371		6,557,368
Pro-forma effect of preferred shares		16,163,598		16,163,598
Denominator for pro-forma basic and diluted calculation
Basic		20,821,632		20,781,900
Diluted		22,690,969		22,720,966
Pro-forma basic and diluted net income per share attributable to ordinary shareholders
Basic	$	0.39	$	0.81
Diluted	$	0.35	$	0.74

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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Work in progress	$ 5,491	$ 3,665
Finished goods	4,339	7,451
Inventories	$ 9,830	$ 11,116

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Prepaid Expenses and Other Current Assets (Tables)

9 Months Ended

Sep. 30, 2013

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

	As of September 30, 2013		As of December 31, 2012
Value-added tax recoverable	$	603	$	486
Prepaid license fees		141		294
Prepayment for material purchase		173		170
Rental deposits		400		321
Value-added tax refundable on export sales		489		306
Other prepaid expenses and other current assets		785		423
	$	2,591	$	2,000

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Convertible Preferred Shares - Additional Information (Detail) (USD $)	9 Months Ended		0 Months Ended	9 Months Ended		1 Months Ended	9 Months Ended				9 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Oct. 02, 2013 Subsequent Events [Member]	Sep. 30, 2013 Qualified IPO [Member]	Sep. 30, 2013 Qualified IPO [Member] Minimum [Member]	Jun. 30, 2010 Series B-2 Convertible Preferred Share [Member]	Sep. 30, 2013 Series B-2 Convertible Preferred Share [Member]		Sep. 30, 2013 Series B Convertible Preferred Shares [Member]	Aug. 18, 2010 Series B Convertible Preferred Shares [Member]	Sep. 30, 2013 Series B-1 Convertible Preferred Shares [Member]	Aug. 18, 2010 Series B-1 Convertible Preferred Shares [Member]	Sep. 30, 2013 Series A Convertible Preferred Shares [Member]
Temporary Equity [Line Items]
Gross proceeds from sale of ordinary shares				$ 50,000,000
Sale price per share			$ 10.00		$ 5.00
Share reserved as available for conversion of preferred share	16,163,598
Weighted Average Subscription price per share						$ 2.7990	$ 2.7990	[1]
Conversion price of preferred shares										$ 3.1715		$ 3.8450
Number of common shares issued for conversion of convertible preferred shares										1.0173		1.040
Convertible preferred shares dividend percentage on issuance price	8.00%						8.00%		8.00%		8.00%		8.00%
Convertible preferred shares, liquidation preference percentage of subscription price							100.00%		100.00%		100.00%		100.00%
Terms of redemption rights	The holders of the Company’s Series B and B-1 preferred shares hold redemption rights such that at any time after June 19, 2011, if at least two-thirds of the holders of Series B and B-1 convertible preferred shares, voting together, elect to redeem their shares, the Company shall redeem all Series B and B-1 convertible preferred shares. The holders of the Company’s Series B-2 convertible preferred shares hold redemption rights such that at any time after June 1, 2013, if at least two-thirds of the holders of Series B-2 elect to redeem their shares, the Company shall redeem all Series B-2 convertible preferred shares. The redemption price available to Series B, B-1 and B-2 shall be 130% of subscription price per share, plus all declared and unpaid dividends.According to the shareholders' resolution dated August 13, 2013, the first possible redemption dates of the Company's Series B, B-1 and B-2 preferred shares were amended to January 1, 2014, respectively.
Convertible preferred shares redemption percentage of subscription price							130.00%		130.00%		130.00%
The aggregate amount of redemption for all issued redeemable preferred shares each year for five years		$ 48,400,000
Ordinary shares issued upon conversion of Convertible Preferred Shares			16,163,598

[1] Pursuant to the Company's Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.

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Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Provision for income tax	$ 737,000	$ 427,000	$ 1,709,000	$ 980,000
Effective tax rate	8.40%	6.30%	9.20%	6.30%
Unrecognized tax benefits that would affect the effective tax rate	$ 6,900,000		$ 6,900,000

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Convertible Preferred Shares - Summary of Convertible Preferred Shares (Detail) (USD $) In Thousands, except Share data, unless otherwise specified				9 Months Ended				9 Months Ended					1 Months Ended	9 Months Ended
	Sep. 06, 2013	Sep. 30, 2013 Series A Convertible Preferred Shares [Member]	Dec. 31, 2012 Series A Convertible Preferred Shares [Member]	Sep. 30, 2013 Series A Convertible Preferred Shares [Member] Date 1 [Member]	Sep. 30, 2013 Series A Convertible Preferred Shares [Member] Date 2 [Member]	Sep. 30, 2013 Series B Convertible Preferred Shares [Member]	Dec. 31, 2012 Series B Convertible Preferred Shares [Member]	Sep. 30, 2013 Series B Convertible Preferred Shares [Member] Date 1 [Member]		Sep. 30, 2013 Series B Issued Upon Exercise of Warrant [Member]	Sep. 30, 2013 Series B-1 Convertible Preferred Shares [Member]	Dec. 31, 2012 Series B-1 Convertible Preferred Shares [Member]	Jun. 30, 2010 Series B-2 Convertible Preferred Share [Member]	Sep. 30, 2013 Series B-2 Convertible Preferred Share [Member]		Sep. 30, 2013 Series B-2 Convertible Preferred Share [Member] Date 1 [Member]	Sep. 30, 2013 Series B-2 Convertible Preferred Share [Member] Date 2 [Member]	Sep. 30, 2013 Series B-2 Convertible Preferred Share [Member] Date 3 [Member]	Sep. 30, 2013 Convertible Preferred Shares [Member]
Temporary Equity [Line Items]
Convertible Preferred Shares, Weighted Average Subscription Price Per Share													$ 2.7990	$ 2.7990	[1]
Convertible Preferred Shares, Issuance date				Apr. 23, 2004	Aug. 31, 2004			Jun. 19, 2006		Dec. 20, 2007	May 18, 2007					Oct. 08, 2009	Oct. 22, 2009	Jun. 30, 2010
Convertible Preferred Shares, Par Value Per Share	$ 0.0125	$ 0.0125	$ 0.0125			$ 0.0125	$ 0.0125	$ 0.0125		$ 0.0125	$ 0.0125	$ 0.0125		$ 0.0125
Convertible Preferred Shares, Subscription Price Per Share		$ 1.2500						$ 3.2263		$ 2.5400	$ 3.9985
Convertible Preferred Shares, Shares Authorized		4,800,000	4,800,000			4,681,416	4,681,416	4,681,416	[2]		4,551,709	4,551,709		3,571,514		3,571,514			17,604,639
Convertible preferred shares, shares outstanding		4,800,000	4,800,000			4,255,843	4,255,843	3,325,843		930,000	4,049,276	4,049,276		2,839,409		2,839,409			15,944,528
Convertible Preferred Shares, Carrying Amount		$ 6,000	$ 6,000			$ 17,020	$ 17,020	$ 13,949		$ 3,071	$ 21,048	$ 21,048		$ 10,332		$ 10,332			$ 54,400
Convertible preferred shares, liquidation value		$ 6,000	$ 6,000			$ 13,092	$ 13,092	$ 10,730		$ 2,362	$ 16,191	$ 16,191		$ 7,947		$ 7,947			$ 43,230

[1] Pursuant to the Company's Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.

[2] Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.

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Net Income Per Share - Computation of Basic and Diluted Net Income Per Ordinary Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator
Net income	$ 8,041	$ 6,365	$ 16,813	$ 14,594
Less: Accretion for preferred shares		(14)	(23)	(42)
Less: Allocation of net income to participating preferred shares and restricted shares	(6,460)	(5,194)	(13,651)	(12,038)
Numerator for basic calculation	1,581	1,157	3,139	2,514
Undistributed earnings re-allocated to ordinary share holders	455	397	926	847
Numerator for diluted calculation	$ 2,036	$ 1,554	$ 4,065	$ 3,361
Denominator
Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding	4,658,034	4,321,144	4,618,302	4,303,135
Dilutive effect of share option	1,860,216	2,070,108	1,926,644	1,991,931
Dilutive effect of restricted shares and awards	9,121		12,422
Denominator for diluted calculation	6,527,371	6,391,252	6,557,368	6,295,066
Net income per share
Basic	$ 0.34	$ 0.27	$ 0.68	$ 0.58
Diluted	$ 0.31	$ 0.24	$ 0.62	$ 0.53

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Share-Based Compensation - Schedule of Recognized Share-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Operating Expenses
Share-based compensation expense			$ 2,462	$ 682
Share Options [Member] | Cost of Net Revenue [Member]
Operating Expenses
Share-based compensation expense	15	5	30	15
Share Options [Member] | Research and Development [Member]
Operating Expenses
Share-based compensation expense	316	137	715	347
Share Options [Member] | Sales, General and Administrative [Member]
Operating Expenses
Share-based compensation expense	552	151	1,213	320
Restricted Share Awards [Member]
Operating Expenses
Share-based compensation expense			504
Restricted Share Awards [Member] | Cost of Net Revenue [Member]
Operating Expenses
Share-based compensation expense	19		32
Restricted Share Awards [Member] | Research and Development [Member]
Operating Expenses
Share-based compensation expense	230		409
Restricted Share Awards [Member] | Sales, General and Administrative [Member]
Operating Expenses
Share-based compensation expense	$ 36		$ 63

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Restricted Net Assets

9 Months Ended

Sep. 30, 2013

Receivables [Abstract]

Restricted Net Assets

20. Restricted Net Assets

Regulations in the PRC currently permit payment of dividends of a PRC company only out of accumulated profits as determined in accordance with accounting standards and regulations in China. Under PRC law, the Company’s subsidiaries incorporated in China are required to set aside at least 10% of their after-tax profit based on PRC accounting standards each year to their general reserves until the cumulative amount reaches 50% of their paid-in capital. These reserves are not distributable as cash dividends, or as loans or advances.

As a result of these and other restrictions under PRC laws and regulations, the PRC subsidiaries are restricted in their ability to transfer a portion of their net assets to the Company either in the form of dividends, loans or advances, which restricted portion amounted to approximately $10,749 and $10,749 of the Company’s total unaudited condensed consolidated net assets as of September 30, 2013 and December 31, 2012. Even though the Company currently does not require any such dividends, loans or advances from the PRC subsidiaries for working capital and other funding purposes, the Company may in the future require additional cash resources from our PRC subsidiaries due to changes in business conditions, to fund future acquisitions and developments, or merely declare and pay dividends to or distributions to the Company’s shareholders.

For the nine months ended September 30, 2013, no dividends were declared by any of the Company’s subsidiaries.

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Organization and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Organization and Summary of Significant Accounting Policies

1. Organization and Summary of Significant Accounting Policies

a. Organization

Montage Technology Group Limited (the “Company”) was incorporated as an international business company with limited liability under International Business Companies Act, 1984 of the British Virgin Islands on March 29, 2004 and continued to, and registered in the Cayman Islands as an exempted company on April 24, 2006. The Company conducts business in several territories including China, Hong Kong, Taiwan and the United States through its wholly owned subsidiaries.

The Company is a global fabless provider of analog and mixed signal semiconductor solutions currently addressing the home entertainment and cloud computing markets. The foundation of its technology platform is the Company’s ability to design high performance, low power semiconductors by using its proprietary building blocks which include radio frequency and analog front end solutions, digital signal processors and high speed interfaces. In the home entertainment market, the Company’s technology platform enables it to design highly integrated solutions with customized software for set-top boxes. The Company’s solutions optimize signal processing performance under demanding operating conditions typically found in emerging market environments. In the cloud computing market, the Company offers high performance, low power memory interface solutions that enable memory intensive server applications.

b. Initial Public Offering

On October 1, 2013, the Company completed an initial public offering (the “Offering”) of 8,165,000 shares of ordinary shares at a price of $10.00 per share, including 5,325,000 additional ordinary shares issued by the Company and 2,840,000 shares sold by existing shareholders. Accordingly, the Company received net proceeds of $49.5 million from the issuance of the ordinary shares in the offering after deducting underwriting discounts and commissions of $3.7 million and excluding other offering expenses of approximately $3.2 million.

Upon completion of the initial public offering on October 1, 2013, the Series A, B, B1 and B2 Convertible Preferred Shares automatically converted into 16,163,598 ordinary shares and the related carrying amount were reclassified as additional paid-in capital. As these transactions occurred after September 30, 2013, they are not reflected in the unaudited condensed consolidated financial statements as of and for the three month period ended September 30, 2013. See Note 19 for discussion of the unaudited pro forma information.

c. Basis of Presentation

The unaudited condensed consolidated financial statements include the accounts of the Company and all of its subsidiaries. All intercompany transactions have been eliminated upon consolidation. The interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Securities and Exchange Commission (“SEC”), Form 10-Q and Article 10 of SEC Regulation S-X.

The unaudited condensed consolidated financial statements contain all normal recurring accruals and adjustments that, in the opinion of management, are necessary to state fairly the Company’s unaudited consolidated financial position at September 30, 2013 and 2012. The results of operations for the nine months ended September 30, 2013 are not necessarily indicative of the results to be expected for future quarters or the full year.

These unaudited interim condensed financial statements do not include all of the information and footnotes required by US GAAP for complete financial statements. Therefore, these unaudited interim condensed financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related footnotes for the year ended December 31, 2012, included in the Company’s prospectus filed with the SEC in September 2013 (“Company Prospectus”).

All share-related disclosures, including par value, share price, number of ordinary shares, preferred shares, share options, restricted shares, warrants, exercise prices of share options, restricted shares, related fair value per share, and net income per share calculations, have been recast to reflect the 2.5-for-1 reverse share split (See Note 17) for all periods presented.

d. Use of Estimates

The preparation of the interim condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of net revenue and expenses during the reporting period. Actual results could differ from those estimates. Significant accounting estimates reflected in the Company’s consolidated financial statements mainly include share-based compensation, allowance for doubtful accounts, inventory write-down, allowance for deferred tax assets, provision for uncertain tax positions, and estimated useful lives of equipment and intangible assets.

e. Significant Accounting Policies

There has been no material change to the Company’s significant accounting policies disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Company Prospectus filed with the SEC in September 2013.

f. Recent Accounting Pronouncements

There has been no material change to Recent Accounting Pronouncements from those disclosed in the Company’s consolidated financial statements for the year ended December 31, 2012 included in the Prospectus filed with the SEC in September 2013.

g. Concentration of Credit Risks

Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable.

As of September 30, 2013, substantially all of the Company’s cash and cash equivalents and short-term investments were held by reputable financial institutions in the jurisdictions where the Company and its subsidiaries are located. The Company believes that it is not exposed to unusual risks as these financial institutions have high credit quality. The Company has not experienced any losses on its deposits of cash and cash equivalents, and short-term investments.

The following table summarizes the percentage of the Company’s revenue and accounts receivable represented by distributors and customers with balances over 10% of total revenue:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
Revenue	2012			2013			2012			2013
Company A		58	%		73	%		43	%		71	%
Company B		13	%		9	%		21	%		8	%

Accounts receivable	December 31, 2012			September 30, 2013
Company A		89	%		79	%

The Company establishes credit limits for each distributor and customer and reviews such limits prior to product shipment. The Company did not experience significant credit loss from its distributors and customers during the periods presented.

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Fair Market Value of Financial Instruments

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Market Value of Financial Instruments

3. Fair Market Value of Financial Instruments

The carrying amounts reflected in the balance sheet for cash and cash equivalents, accounts receivable, prepaid and other current assets, accounts payable, accrued expenses and other current liabilities, approximate their fair value due to the short-term nature of these financial instruments.

The following table sets forth the financial instruments, measured at fair value by level within the fair value hierarchy as of December 31, 2012 and September 30, 2013:

			Fair value measure at reporting date using
As of December 31, 2012	As of December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash	$	12,175	$	12,175	$	—	$	—
Time deposit within the maturity term below 3 months		9,405		9,405		—		—
Short-term investments		6,472		—		6,472		—
Total	$	28,052	$	21,580	$	6,472	$	—

			Fair value measure at reporting date using
As of September 30, 2013	As of September 30, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash	$	27,414	$	27,414	$	—	$	—
Bank investment product readily convertible within the maturity term below 3 months		9,759		—		9,759		—
Time deposit with the maturity term below 3 months		4,008		4,008		—		—
Time deposit with the maturity term greater than 3 months but less than 1 year		50		50		—		—
Short-term investments		6,393		—		6,393		—
Total	$	47,624	$	31,472	$	16,152	$	—

As of September 30, 2013 and December 31, 2012, the investments measured at fair value by level 2 are issued by banks with variable interest rates indexed to performance of underlying assets. Since these investments’ maturity dates are within one year, they are classified as short-term investments. To estimate the fair value of the short-term investments, the Company refers to the quoted rate of return provided by the bank at the end of each period using the discounted cash flow method. The Company classifies the valuation techniques that use these inputs as Level 2 of fair value measurements. The Company recorded in the unaudited condensed consolidated statements of operations and comprehensive income a change in the fair value of short-term investments in the amount of $182, $43, $344, and $63 for the three months and nine months ended September 30, 2013, and 2012, respectively.

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Property and Equipment, Net

9 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Property and Equipment, Net

6. Property and Equipment, Net

Property and equipment, net consist of the following:

	As of September 30, 2013			As of December 31, 2012
Office and other equipment	$	3,862		$	3,193
Furniture and fixtures		663			475
Leasehold improvements		1,665			1,354
		6,190			5,022
Less: accumulated depreciation and amortization		(3,731	)		(2,738	)
	$	2,459		$	2,284

The depreciation expense of property and equipment for the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012 was $ 310, $207, $929 and $ 482, respectively.

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Segment and Geographic Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013 Segment
Segment Reporting [Abstract]
Number of operating segment	1

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Inventories

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Inventories

4. Inventories

Inventories consist of the following:

	As of September 30, 2013		As of December 31, 2012
Work in progress	$	5,491	$	3,665
Finished goods		4,339		7,451
	$	9,830	$	11,116

During the second quarter of 2013, in order to prepare for the implementation of a new ERP system, management performed a detailed review of the production processes of the Company’s products and concluded that, upon completion of the final quality testing and prior to packing for shipping, those products should be included in finished goods as they are ready for sale. Previously, products were not classified as finished goods until they were fully packed for shipment. Accordingly, the Company has revised the classification of work in progress and finished goods by stage of production to include completed but not packaged products as finished goods. Management considers that both approaches of segregating work in progress and finished goods have their basis. To ensure the disclosure of inventory is consistent for each of the periods presented, the Company has revised the classification of inventory by stage of completion by now including $5,464 and $7,373 in finished goods as of December 31, 2012, respectively that was previously included in work in progress. This revision had no impact on total inventory balances.

For the three months and nine months ended September 30, 2013, and 2012, the Company recorded inventory write-downs of $109, $414, $23, and $204, respectively, due to excess and obsolete inventory and lower of cost or market markdown. As of September 30, 2013 and December 31, 2012, the Company has a total inventory reserve balance of $ 1,321, and $2,406, respectively. Once the write-down is recorded, it establishes a new cost basis and is not subsequently reversed.

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Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Sep. 06, 2013	Oct. 02, 2013 Subsequent Events [Member]
Organization And Significant Accounting Policies [Line Items]
Initial public offering, ordinary shares issued		8,165,000
Initial public offering, price per share		$ 10.00
Initial public offering, additional shares issued		5,325,000
Initial public offering, shares sold by shareholders		2,840,000
Proceeds from issuance of ordinary shares		$ 49.5
Underwriting discounts and commissions		3.7
Other offering expenses		$ 3.2
Ordinary shares issued upon conversion of Convertible Preferred Shares		16,163,598
Reverse share split	2.5-for-1

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Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income Per Ordinary Share

The following shows the computation of basic and diluted net income per ordinary share:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Numerator
Net income	$	8,041		$	6,365		$	16,813		$	14,594
Less: Accretion for preferred shares		—			(14	)		(23	)		(42	)
Less: Allocation of net income to participating preferred shares and restricted shares		(6,460	)		(5,194	)		(13,651	)		(12,038	)
Numerator for basic calculation		1,581			1,157			3,139			2,514
Undistributed earnings re-allocated to ordinary share holders		455			397			926			847
Numerator for diluted calculation	$	2,036		$	1,554		$	4,065		$	3,361
Denominator
Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding		4,658,034			4,321,144			4,618,302			4,303,135
Dilutive effect of share option		1,860,216			2,070,108			1,926,644			1,991,931
Dilutive effect of restricted shares and awards		9,121			—			12,422			—
Denominator for diluted calculation		6,527,371			6,391,252			6,557,368			6,295,066
Net income per share
Basic	$	0.34		$	0.27		$	0.68		$	0.58
Diluted	$	0.31		$	0.24		$	0.62		$	0.53

Schedule of Anti-dilutive Shares not Included in Calculation of Diluted Net Income Per Share

The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share because including them would be anti-dilutive as of the end of each period presented:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Convertible preferred shares		16,163,598		16,163,598		16,163,598		16,163,598

Schedule of Equity Awards not Included In Calculation of Diluted Net Income Per Share

The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share for the corresponding periods because the number of shares calculated based on the assumed proceeds from exercise of the equity awards and the weighted average fair value of the Company’s ordinary shares is higher than the number of shares assumed to be issued under the awards:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Equity awards outstanding		1,768,960		403,520		1,726,480		417,120

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Property and Equipment, Net (Tables)

9 Months Ended

Sep. 30, 2013

Property Plant And Equipment [Abstract]

Summary of Property and Equipment, Net

Property and equipment, net consist of the following:

	As of September 30, 2013			As of December 31, 2012
Office and other equipment	$	3,862		$	3,193
Furniture and fixtures		663			475
Leasehold improvements		1,665			1,354
		6,190			5,022
Less: accumulated depreciation and amortization		(3,731	)		(2,738	)
	$	2,459		$	2,284

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Share-Based Compensation - Summary of Details Related to RSAs, Granted and Outstanding (Detail) (Restricted Share Awards [Member], USD $)	0 Months Ended	9 Months Ended
	Apr. 23, 2013	Sep. 30, 2013
Restricted Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Beginning balance
Weighted-Average Grant Date Fair Value Per Share, Granted		$ 17.98
Weighted-Average Grant Date Fair Value Per Share, Vested
Weighted-Average Grant Date Fair Value Per Share, Forfeited		$ 17.98
Weighted-Average Grant Date Fair Value Per Share, Outstanding, Ending balance		$ 17.98
Number of Shares, Outstanding, Beginning balance
Number of Shares, Granted	317,120	330,620
Number of Shares, Vested
Number of Shares, Forfeited		8,200
Number of Shares, Outstanding, Ending balance		322,420

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Share-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

Assumptions Used in Valuation of Fair Value of Share Options Granted

The Company uses the Black-Scholes valuation model to calculate the fair value of share options. The fair value of share options granted to employees is estimated as of the grant date. The fair value of the share options granted to non-employees is re-measured at each reporting date. The assumptions used in valuation were as follows:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2013	2012	2013	2012
Risk-free interest rate	2.52%-3.53%	1.10-2.61%	1.11-3.53%	1.10-3.13%
Expected term (in years)	6 to 10	6 to 10	6 to 10	6 to 10
Dividend yield	—	—	—	—
Volatility	48.04%-49.75%	43.81%-50.40%	39.69%-49.75%	43.81%-52.66%

Summary of Stock Options Granted and Outstanding Under 2006 Share Incentive Plan

The following table summarizes the details related to stock options granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:

	Number of Shares		Weighted Average Exercise Price		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
Balance at December 31, 2012		2,734,688	$	2.40
Granted		1,330,760		17.68
Exercised		263,667		0.30
Forfeited		26,019		10.64
Canceled		4,669		0.99
Outstanding at September 30, 2013		3,771,093	$	7.89		7.00	$	28,412
Exercisable at September 30, 2013		3,146,996	$	7.21		6.61	$	25,571
Vested at September 30, 2013		1,883,245	$	1.34		4.74	$	24,225
Vested and expected to vest at September 30, 2013		3,611,003	$	7.54		6.89	$	28,202

Summary of Information about Share Options Outstanding

The following table summarizes information about share options outstanding as of September 30, 2013:

							Share Options
	Share Options Outstanding						Exercisable
Range of Exercise Prices	Shares Outstanding		Weighted Average Remaining Contractual Term (in years)		Weighted Average Exercise Price		Shares Exercisable		Weighted Average Exercise Price
$0.13 - $0.25		789,600		2.75	$	0.13		789,600	$	0.13
$0.40 - $1.03		758,480		5.24		0.96		735,166		0.96
$2.20 - $9.43		897,253		8.44		6.11		581,830		6.08
$16.03 - $17.85		1,325,760		9.56		17.68		1,040,400		17.64
		3,771,093		7.00	$	7.89		3,146,996	$	7.21

Summary of Details Related to RSAs, Granted and Outstanding

The following table summarizes the details related to RSAs, granted and outstanding under the 2006 Share Incentive Plan for the nine months ended September 30, 2013:

				Weighted-Average
	Number			Grant Date Fair
	of Shares			Value Per Share
Balance at December 31, 2012		—		$	—
Granted		330,620			17.98
Vested		—			—
Forfeited		8,200			17.98
Outstanding at September 30, 2013		322,420	(*)	$	17.98

(*) The restricted shares are not included in the outstanding ordinary shares due to their restrictions.

Share Options [Member]

Schedule of Recognized Share-Based Compensation Expense

The Company recognized share-based compensation expense for options as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Operating Expenses
Cost of net revenue	$	15	$	5	$	30	$	15
Research and development		316		137		715		347
Sales, general and administrative		552		151		1,213		320

Restricted Share Awards [Member]

Schedule of Recognized Share-Based Compensation Expense

The Company recognized share-based compensation expense for RSAs as follows (in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Operating Expenses
Cost of net revenue	$	19	$	—	$	32	$	—
Research and development		230		—		409		—
Sales, general and administrative		36		—		63		—

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Share-Based Compensation - Summary of Information about Share Options Outstanding (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share Options Outstanding, Share Outstanding	3,771,093	2,734,688
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	7 years
Share Options Outstanding, Weighted Average Exercise Price	$ 7.89	$ 2.40
Share Options Exercisable, Shares Exercisable	3,146,996
Share Options Exercisable, Weighted Average Exercise Price	$ 7.21
$0.13 - $0.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share Options Outstanding, Share Outstanding	789,600
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	2 years 9 months
Share Options Outstanding, Weighted Average Exercise Price	$ 0.13
Share Options Exercisable, Shares Exercisable	789,600
Share Options Exercisable, Weighted Average Exercise Price	$ 0.13
Range of Exercise Prices	$ 0.13
Range of Exercise Prices	$ 0.25
$0.40 - $1.03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share Options Outstanding, Share Outstanding	758,480
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	5 years 2 months 27 days
Share Options Outstanding, Weighted Average Exercise Price	$ 0.96
Share Options Exercisable, Shares Exercisable	735,166
Share Options Exercisable, Weighted Average Exercise Price	$ 0.96
Range of Exercise Prices	$ 0.40
Range of Exercise Prices	$ 1.03
$2.20 - $9.43 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share Options Outstanding, Share Outstanding	897,253
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	8 years 5 months 9 days
Share Options Outstanding, Weighted Average Exercise Price	$ 6.11
Share Options Exercisable, Shares Exercisable	581,830
Share Options Exercisable, Weighted Average Exercise Price	$ 6.08
Range of Exercise Prices	$ 2.20
Range of Exercise Prices	$ 9.43
$16.03 - $17.85 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share Options Outstanding, Share Outstanding	1,325,760
Share Options Outstanding, Weighted Average Remaining Contractual Term (in years)	9 years 6 months 22 days
Share Options Outstanding, Weighted Average Exercise Price	$ 17.68
Share Options Exercisable, Shares Exercisable	1,040,400
Share Options Exercisable, Weighted Average Exercise Price	$ 17.64
Range of Exercise Prices	$ 16.03
Range of Exercise Prices	$ 17.85

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Acquired Intangible Assets, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization expense	$ 324	$ 124	$ 986	$ 162

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Inventories - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2012 Restatement Adjustment [Member]	Dec. 31, 2011 Restatement Adjustment [Member]
Inventory [Line Items]
Finished goods	$ 4,339		$ 4,339		$ 7,451	$ 7,373	$ 5,464
Inventory write-downs	109	23	414	204
Inventory reserve balance	$ 1,321		$ 1,321		$ 2,406

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Net Income Per Share - Schedule of Anti-dilutive Shares not Included in Calculation of Diluted Net Income Per Share (Detail) (Convertible Preferred Shares [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Convertible Preferred Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from calculation of diluted net income per share	16,163,598	16,163,598	16,163,598	16,163,598

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Ordinary shares, par value	$ 0.0125	$ 0.0125
Ordinary shares, shares authorized	26,804,639	26,804,639
Ordinary shares, shares issued	4,660,025	4,403,859
Ordinary shares, shares outstanding	4,660,025	4,403,859
Series A Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,800,000	4,800,000
Convertible preferred shares, shares issued	4,800,000	4,800,000
Convertible preferred shares, shares outstanding	4,800,000	4,800,000
Convertible preferred shares, liquidation value	$ 6,000	$ 6,000
Series B Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,681,416	4,681,416
Convertible preferred shares, shares issued	4,255,843	4,255,843
Convertible preferred shares, shares outstanding	4,255,843	4,255,843
Convertible preferred shares, liquidation value	13,092	13,092
Series B-1 Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,551,709	4,551,709
Convertible preferred shares, shares issued	4,049,276	4,049,276
Convertible preferred shares, shares outstanding	4,049,276	4,049,276
Convertible preferred shares, liquidation value	16,191	16,191
Series B-2 Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125	$ 0.0125
Convertible Preferred Shares, Shares Authorized	3,571,514	3,571,514
Convertible preferred shares, shares issued	2,839,409	2,839,409
Convertible preferred shares, shares outstanding	2,839,409	2,839,409
Convertible preferred shares, liquidation value	$ 7,947	$ 7,947
Pro Forma [Member]
Ordinary shares, par value	$ 0.0125
Ordinary shares, shares authorized	26,804,639
Pro Forma [Member] | Series A Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,800,000
Convertible preferred shares, shares outstanding
Pro Forma [Member] | Series B Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,681,416
Convertible preferred shares, shares outstanding
Pro Forma [Member] | Series B-1 Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125
Convertible Preferred Shares, Shares Authorized	4,551,709
Convertible preferred shares, shares outstanding
Pro Forma [Member] | Series B-2 Convertible Preferred Shares [Member]
Convertible preferred shares, par value	$ 0.0125
Convertible Preferred Shares, Shares Authorized	3,571,514
Convertible preferred shares, shares outstanding

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Accrued Liabilities

9 Months Ended

Sep. 30, 2013

Payables And Accruals [Abstract]

Accrued Liabilities

9. Accrued Liabilities

Accrued liabilities consist of the following:

	As of September 30, 2013		As of December 31, 2012
Government funding for research and development projects (1)	$	3,893	$	3,055
Accrued employee compensation and other employee expenses		3,504		4,505
Accrued research and development expenses		—		28
Advances from customers		267		230
Accrued warranty		187		149
Accrued professional service fee		3,484		497
Proceeds received for early exercised options		8		—
Other accrued liabilities		598		644
	$	11,941	$	9,108

(1) For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded nil, $1,025, $396, and $1,025 government funding as a deduction to expense, respectively. The Company has not recorded any reduction to the carrying value of depreciable assets. As of December 31, 2012 and September 30, 2013, the Company has recorded an accrued liability for cash funding received from the PRC government of $3,055, and $3,893, respectively, because the government had not commenced its review of the research and development projects qualified for funding at the end of the respective periods.

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Condensed Consolidated Statement of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 16,813	$ 14,594
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,915	644
Share-based compensation	2,462	682
Deferred income taxes	2	61
Inventory write-downs	414	204
Exchange loss (gain)	320	(61)
Changes in assets and liabilities:
Accounts receivable	(2,510)	(1,492)
Inventories	957	(381)
Prepaid expenses and other current assets	(488)	7
Accounts payable	1,615	(2,717)
Income tax payable	1,154	922
Deferred margin, net	345	(4,139)
Other payables and accruals	103	(2,255)
Net cash provided by operating activities	23,102	6,069
Cash flows from investing activities:
Purchases of property and equipment	(1,160)	(1,509)
Purchase of intangible assets	(484)	(950)
Purchase of short-term investments	(33,190)	(6,398)
Proceeds from maturities of short-term investments	33,453	3,154
Net cash used in investing activities	(1,381)	(5,703)
Cash flows from financing activities:
Proceeds from exercise of options	64	12
Proceeds from early exercise of options	11
Proceeds from short-term loans		1,578
Repayment for short-term loans	(1,591)	(2,056)
Cash paid for initial public offering cost	(421)
Net cash used in financing activities	(1,937)	(466)
Effect of exchange rate changes on cash	(183)	(44)
Net increase (decrease) in cash and cash equivalents	19,601	(144)
Cash and cash equivalents at beginning of period	21,580	23,343
Cash and cash equivalents at end of period	41,181	23,199
Supplemental Cash Flow Information
Income taxes paid	554
Interest paid	10	79
Non-cash investing and financing activities
Accounts payable for acquisition of property and equipment	59	70
Vesting of ordinary shares issued for early exercised options	5	9
Accrued initial public offering cost	$ 2,676

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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables And Accruals [Abstract]
Government funding for research and development projects	$ 3,893	$ 3,055
Accrued employee compensation and other employee expenses	3,504	4,505
Accrued research and development expenses		28
Advances from customers	267	230
Accrued warranty	187	149
Accrued professional service fee	3,484	497
Proceeds received for early exercised options	8
Other accrued liabilities	598	644
Accrued liabilities	$ 11,941	$ 9,108

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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 41,181	$ 21,580
Short-term investments	6,443	6,472
Accounts receivable, net	10,413	7,903
Inventories	9,830	11,116
Prepaid expenses and other current assets	2,591	2,000
Current deferred tax assets	343	338
Total current assets	70,801	49,409
Property and equipment, net	2,459	2,284
Acquired intangible assets, net	1,020	1,496
Deferred tax assets	330	330
Deferred offering costs	3,240	283
Total assets	77,850	53,802
Current liabilities:
Accounts payable	5,345	3,719
Short-term loans		1,591
Accrued liabilities	11,941	9,108
Deferred margin, net	1,545	1,200
Income tax payable	1,422	261
Current deferred tax liabilities	34	34
Total current liabilities	20,287	15,913
Long-term liabilities	4,288	4,295
Total liabilities	24,575	20,208
Commitments and contingencies
Shareholders' equity (deficit):
Ordinary shares, $0.0125 par value; 26,804,639 shares authorized; 4,403,859 and 4,660,025 issued and outstanding as of December 31, 2012 and September 30, 2013, respectively	58	55
Additional paid-in capital	3,515	1,010
Accumulated comprehensive income	2,148	1,811
Statutory reserves	740	740
Accumulated deficit	(7,586)	(24,399)
Total shareholders' equity (deficit)	(1,125)	(20,783)
Total liabilities, convertible preferred shares and shareholders' equity (deficit)	77,850	53,802
Series A Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value	6,000	6,000
Series B Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value	17,020	17,020
Series B-1 Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value	21,048	21,048
Series B-2 Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value	10,332	10,309
Pro Forma [Member]
Current assets:
Cash and cash equivalents	41,181
Short-term investments	6,443
Accounts receivable, net	10,413
Inventories	9,830
Prepaid expenses and other current assets	2,591
Current deferred tax assets	343
Total current assets	70,801
Property and equipment, net	2,459
Acquired intangible assets, net	1,020
Deferred tax assets	330
Deferred offering costs	3,240
Total assets	77,850
Current liabilities:
Accounts payable	5,345
Short-term loans
Accrued liabilities	11,941
Deferred margin, net	1,545
Income tax payable	1,422
Current deferred tax liabilities	34
Total current liabilities	20,287
Long-term liabilities	4,288
Total liabilities	24,575
Commitments and contingencies
Shareholders' equity (deficit):
Ordinary shares, $0.0125 par value; 26,804,639 shares authorized; 4,403,859 and 4,660,025 issued and outstanding as of December 31, 2012 and September 30, 2013, respectively	260
Additional paid-in capital	57,713
Accumulated comprehensive income	2,148
Statutory reserves	740
Accumulated deficit	(7,586)
Total shareholders' equity (deficit)	53,275
Total liabilities, convertible preferred shares and shareholders' equity (deficit)	77,850
Pro Forma [Member] | Series A Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value
Pro Forma [Member] | Series B Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value
Pro Forma [Member] | Series B-1 Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value
Pro Forma [Member] | Series B-2 Convertible Preferred Shares [Member]
Convertible preferred shares:
Convertible preferred shares, value

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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Value-added tax recoverable	$ 603	$ 486
Prepaid license fees	141	294
Prepayment for material purchase	173	170
Rental deposits	400	321
Value-added tax refundable on export sales	489	306
Other prepaid expenses and other current assets	785	423
Prepaid expenses and other current assets, total	$ 2,591	$ 2,000

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Subsequent Events - Additional Information (Detail) (Subsequent Events [Member])	0 Months Ended
	Oct. 02, 2013
Subsequent Events [Member]
Subsequent Event [Line Items]
Public offering shares	8,165,000
Ordinary shares issued upon conversion of Convertible Preferred Shares	16,163,598

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Segment and Geographic Information - Summary of Company's Revenue Generated from Sales of Semiconductors Solutions (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 30,056	$ 20,601	$ 75,448	$ 54,538
Home Entertainment [Member]
Segment Reporting Information [Line Items]
Revenue	27,255	18,649	68,371	50,614
Cloud Computing Market [Member]
Segment Reporting Information [Line Items]
Revenue	$ 2,801	$ 1,952	$ 7,077	$ 3,924

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Fair Market Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Summary of Financial Instruments, Measured at Fair Value by Level within Fair Value Hierarchy

The following table sets forth the financial instruments, measured at fair value by level within the fair value hierarchy as of December 31, 2012 and September 30, 2013:

			Fair value measure at reporting date using
As of December 31, 2012	As of December 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash	$	12,175	$	12,175	$	—	$	—
Time deposit within the maturity term below 3 months		9,405		9,405		—		—
Short-term investments		6,472		—		6,472		—
Total	$	28,052	$	21,580	$	6,472	$	—

			Fair value measure at reporting date using
As of September 30, 2013	As of September 30, 2013		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash	$	27,414	$	27,414	$	—	$	—
Bank investment product readily convertible within the maturity term below 3 months		9,759		—		9,759		—
Time deposit with the maturity term below 3 months		4,008		4,008		—		—
Time deposit with the maturity term greater than 3 months but less than 1 year		50		50		—		—
Short-term investments		6,393		—		6,393		—
Total	$	47,624	$	31,472	$	16,152	$	—

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Subsequent Events

9 Months Ended

Sep. 30, 2013

Subsequent Events [Abstract]

Subsequent Events

18. Subsequent Events

On September 24, 2013, the Company registration statement on Form S-1 (File No. 333-190761) was declared effective by the SEC for the initial public offering of 8,165,000 shares of ordinary shares. The offering was completed on October 1, 2013 (note 1b).

Upon completion of the initial public offering of the Company on October 1, 2013, the Series A, B, B1 and B2 Convertible Preferred Shares automatically converted into 16,163,598 ordinary shares.

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Net Income Per Share - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Apr. 23, 2013 Restricted Share Awards [Member]	Sep. 30, 2013 Restricted Share Awards [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of restricted shares, granted					317,120	330,620
Noncumulative dividends percentage			8.00%
Noncumulative dividend of preferred shares	$ 865	$ 865	$ 2,594	$ 2,594
Undistributed earnings attributable to preferred shares	5,595	4,329	11,057	9,444
Undistributed earnings re-allocated to ordinary share holders	$ 455	$ 397	$ 926	$ 847

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Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commitments And Contingencies Disclosure [Abstract]
Rent expense under operating leases	$ 352	$ 234	$ 917	$ 517

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Acquired Intangible Assets, Net - Summary of Acquired Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Acquired Intangible Assets [Line Items]
Less: accumulated amortization	$ (1,390)	$ (554)
Acquired intangible assets, net	1,020	1,496
Montage Macao License [Member]
Acquired Intangible Assets [Line Items]
Acquired intangible assets	129
Assembled Workforce [Member]
Acquired Intangible Assets [Line Items]
Acquired intangible assets, gross	1,900	1,900
Technology Licenses [Member]
Acquired Intangible Assets [Line Items]
Acquired intangible assets, gross	116	150
Software [Member]
Acquired Intangible Assets [Line Items]
Acquired intangible assets, gross	$ 265

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Convertible Preferred Shares - Summary of Accretion to Carrying Value of Convertible Preferred Shares (Detail) (Series B-2 Convertible Preferred Share [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Series B-2 Convertible Preferred Share [Member]
Temporary Equity [Line Items]
Convertible Preferred Shares, Accretion to the Carrying Value		$ 14	$ 23	$ 42

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Summary of Future Minimum Lease Payment under Noncancelable Operating Leases

Future minimum lease payment under noncancelable operating leases having initial terms in excess of one year as of September 30, 2013 are as follows:

	Payment Due by Period
	Total		Less than 1 Year		1 - 3 Years		3 - 5 Years
	(in thousands)
Operating lease obligations	$	2,461	$	315	$	1,877	$	269
Purchase obligations		1,670		1,670		—		—
Total contractual obligations	$	4,131	$	1,985	$	1,877	$	269

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Deferred Margin, Net (Tables)

9 Months Ended

Sep. 30, 2013

Revenue Recognition [Abstract]

Components of Deferred Margin, Net

Deferred margin, net consists of the following:

	As of September 30, 2013			As of December 31, 2012
Deferred revenue	$	20,146		$	15,878
Deferred cost of revenue		(18,601	)		(14,678	)
	$	1,545		$	1,200

Deferred Revenue and Deferred Cost of Revenue on Sales to Distributor

The deferred revenue and deferred cost of revenue on sales to distributor activities for the nine months ended September 30, 2013 and 2012 were as follows:

	Nine Months Ended September 30,
	2013			2012
Balance at the beginning of the period	$	1,200		$	5,147
Revenue deferred upon shipment to distributors		33,847			27,734
Cost of sales deferred upon shipments to distributors		(26,952	)		(18,509	)
Revenue recognized upon resale from distributors to end customers		(29,126	)		(26,295	)
Cost of sales recognized upon resale from distributors to end customers		23,029			13,126
Price adjustments to distributors		(453	)		(195	)
Balance at the end of the period	$	1,545			1,008

Revenue Recognized Upon Resale from Distributors to End Customers

The following table shows reconciliation from revenue recognized upon resale from distributors to end customers as included in the above table to revenue recorded in the consolidated statements of operations and comprehensive income for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Revenue recognized upon resale from distributors to end customers (through deferred revenue)	$	12,063	$	7,842	$	29,126	$	26,295
Revenue recognized upon resale from LQW to end customers (recorded directly in revenue)*		15,136		9,171		38,115		17,998
Revenue recognized for the Company’s sales directly to end customer		2,857		3,588		8,207		10,245
Total	$	30,056	$	20,601	$	75,448	$	54,538

* LQW has been a distributor for the Company’s products since October 2011. The Company is entitled to bill only a portion of the total sale price at the time of shipment (deferred revenue), with the remainder billed upon sale by LQW to the end customer. The portion of the total sale price that the Company is not entitled to bill at the time of shipment to LQW is recorded directly in revenue upon sale by LQW to the end customers.

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Convertible Preferred Shares (Tables)

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Summary of Convertible Preferred Shares

Convertible preferred shares consisted of the following as of September 30, 2013:

Convertible		Par Value Per		Subscription Price			Shares					Carrying Amount		Liquidation Value
Preferred Shares	Issuance date	Share		Per Share			Authorized			Outstanding
Series A	April 23, 2004 and
	August 31, 2004	$	0.0125	$	1.2500			4,800,000			4,800,000	$	6,000	$	6,000
Series B	June 19, 2006		0.0125		3.2263			4,681,416	(1)		3,325,843		13,949		10,730
Series B issued upon exercise of warrant	December 20, 2007		0.0125		2.5400						930,000		3,071		2,362
Series B-1	May 18, 2007		0.0125		3.9985			4,551,709			4,049,276		21,048		16,191
Series B-2	October 8, 2009
	October 22, 2009
	June 30, 2010		0.0125		2.7990	(2)		3,571,514			2,839,409		10,332		7,947
								17,604,639			15,944,528	$	54,400	$	43,230

(1) Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.

(2) Pursuant to the Company’s Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.

Summary of Accretion to Carrying Value of Convertible Preferred Shares

For the three months and nine months ended September 30, 2012 and 2013, the accretion to the carrying value of convertible preferred shares was summarized as follows:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2013		2012		2013		2012
	(unaudited)		(unaudited)		(unaudited)		(unaudited)
Series B-2		—	$	14	$	23	$	42

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Short-Term Loans

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Short-Term Loans

8. Short-Term Loans

There were no short-term bank loans outstanding September 30, 2013. The short-term bank loans outstanding as of December 31, 2012 carried a weighted average interest rate of 5.88%, per annum. The borrowings were repayable in one year of their respective draw-down date. Proceeds from short-term bank borrowings were for working capital purposes. None of the short-term bank loans bear financial covenants or restrictions.

Short-term bank loans as of December 31, 2012 were all denominated in RMB.

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Deferred Margin, Net - Revenue Recognized Upon Resale from Distributors to End Customers (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Deferred Margin, Net [Line Items]
Revenue	$ 30,056	$ 20,601	$ 75,448	$ 54,538
Resale from Distributors to End Customers [Member]
Deferred Margin, Net [Line Items]
Revenue	12,063	7,842	29,126	26,295
Resale from LQW to End Customers [Member]
Deferred Margin, Net [Line Items]
Revenue	15,136	9,171	38,115	17,998
Sales Directly to End Customers [Member]
Deferred Margin, Net [Line Items]
Revenue	$ 2,857	$ 3,588	$ 8,207	$ 10,245

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Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Components of Inventories

Inventories consist of the following:

	As of September 30, 2013		As of December 31, 2012
Work in progress	$	5,491	$	3,665
Finished goods		4,339		7,451
	$	9,830	$	11,116

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Organization and Summary of Significant Accounting Policies - Summary of Percentage of Revenue and Accounts Receivable Represented by Distributors and Customers (Detail)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2013 Revenue [Member] Company A [Member]	Sep. 30, 2012 Revenue [Member] Company A [Member]	Sep. 30, 2013 Revenue [Member] Company A [Member]	Sep. 30, 2012 Revenue [Member] Company A [Member]	Sep. 30, 2013 Revenue [Member] Company B [Member]	Sep. 30, 2012 Revenue [Member] Company B [Member]	Sep. 30, 2013 Revenue [Member] Company B [Member]	Sep. 30, 2012 Revenue [Member] Company B [Member]	Sep. 30, 2013 Accounts Receivable [Member] Company A [Member]	Dec. 31, 2012 Accounts Receivable [Member] Company A [Member]
Concentration Risk [Line Items]
Percentage of revenue and accounts receivable	73.00%	58.00%	71.00%	43.00%	9.00%	13.00%	8.00%	21.00%	79.00%	89.00%

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Convertible Preferred Shares

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

Convertible Preferred Shares

11. Convertible Preferred Shares

Convertible preferred shares consisted of the following as of September 30, 2013:

Convertible		Par Value Per		Subscription Price			Shares					Carrying Amount		Liquidation Value
Preferred Shares	Issuance date	Share		Per Share			Authorized			Outstanding
Series A	April 23, 2004 and
	August 31, 2004	$	0.0125	$	1.2500			4,800,000			4,800,000	$	6,000	$	6,000
Series B	June 19, 2006		0.0125		3.2263			4,681,416	(1)		3,325,843		13,949		10,730
Series B issued upon exercise of warrant	December 20, 2007		0.0125		2.5400						930,000		3,071		2,362
Series B-1	May 18, 2007		0.0125		3.9985			4,551,709			4,049,276		21,048		16,191
Series B-2	October 8, 2009
	October 22, 2009
	June 30, 2010		0.0125		2.7990	(2)		3,571,514			2,839,409		10,332		7,947
								17,604,639			15,944,528	$	54,400	$	43,230

(1) Authorized shares for Series B convertible preferred shares issued on June 19, 2006 also included shares authorized for Series B convertible preferred shares issued upon exercise of warrant on December 20, 2007.

(2) Pursuant to the Company’s Amended and Restated Memorandum and Articles dated September 2009, the subscription price for Series B-2 convertible preferred shares represents the weighted average price of the shares issued in October 2009 and June 2010, respectively.

The Company’s Board of Directors is authorized to determine the rights of each offering of convertible preferred shares including, among other terms, dividend rights, voting rights, conversion rights, redemption prices and liquidation preferences, if any, subject to the limitations of applicable laws, regulations and its charter. The following summarizes the terms of each series of convertible preferred shares:

Conversion Rights

Each share of Series A, Series B, Series B-1 and Series B-2 is convertible, at the holder’s option, into such number of fully paid and nonassessable ordinary shares as is determined by dividing the applicable original issuance price by the conversion price which is the same as the original issue price.

In the event of the issuance of additional ordinary shares, subject to certain exclusions, at a price per share less than the conversion price for any series of convertible preferred shares in effect on the date of such issuance, the conversion price for that series will be adjusted based on a weighted average anti-dilution formula. The conversion price is also subject to adjustment based on certain other anti-dilution provisions. Each convertible preferred share will automatically convert into ordinary shares at its then effective conversion rate immediately upon the closing of an initial public offering pursuant to an effective registration statement under the Securities Act of 1933, as amended, covering the offer and sale of ordinary shares with gross proceeds to the Company of not less than $50 million at a price per share of at least $5.00 (“Qualified IPO”). The Company is required to reserve and keep available, out of its authorized but unissued ordinary shares, 16,163,598 shares for the conversion of convertible preferred shares.

In connection with the issuance of Series B-2 upon the exercise in full of all the Series B-2 warrants, the weighted average price for Series B-2 originally issued in October 2009 and Series B-2 issued upon exercise of warrant in June 2010 was $2.7990 per share, which was less than the original conversion price of Series B issued on June 19, 2006 and Series B-1, the conversion price for Series B issued on June 19, 2006 and Series B-1 was adjusted to $3.1715 and $3.8450 per share, respectively, on August 18, 2010. After such adjustment, each Series B issued on June 19, 2006 and Series B-1 share is convertible into approximately 1.0173 and 1.040 ordinary shares, respectively.

Dividends

The holders of each series of convertible preferred shares are entitled to receive noncumulative dividends per annum when and if declared by the Board of Directors. The Series A, Series B, Series B-1 and Series B-2 convertible preferred shares are entitled to dividends at 8% of the original issuance price per share. After the foregoing dividend payments, if any, have been made in full in a given calendar year, any dividends declared by the Board out of funds legally available shall be shared ratably among the holders of ordinary shares; provided, however, that any non-cash dividends shall be shared ratably among the holders of ordinary and preferred shares on an as-if-converted basis. No dividends have been declared or paid to date.

Liquidation

In the event of any liquidation, dissolution or winding up of the Company, whether voluntarily or involuntary, including a consolidation, merger or acquisition or sale of assets where the beneficial owners of the Company’s ordinary shares and convertible preferred shares own less than a majority of the resulting voting power of the surviving entity, the holders of Series A, Series B, Series B-1 and Series B-2 convertible preferred shares are entitled to receive an amount equal to 100% of the subscription price per share, based on the number of preferred shares plus any declared but unpaid dividends prior to the distribution to the ordinary shares. The remaining assets, if any, shall be distributed among the holders of ordinary shares on a pro rata basis based on the number of shares they hold.

Voting Rights

The holders of each preferred share are entitled to the number of votes equal to the number of ordinary shares into which such preferred shares are converted.

Redemption Rights

The holders of the Company’s Series B and B-1 preferred shares hold redemption rights such that at any time after June 19, 2011, if at least two-thirds of the holders of Series B and B-1 convertible preferred shares, voting together, elect to redeem their shares, the Company shall redeem all Series B and B-1 convertible preferred shares. The holders of the Company’s Series B-2 convertible preferred shares hold redemption rights such that at any time after June 1, 2013, if at least two-thirds of the holders of Series B-2 elect to redeem their shares, the Company shall redeem all Series B-2 convertible preferred shares. The redemption price available to Series B, B-1 and B-2 shall be 130% of subscription price per share, plus all declared and unpaid dividends.

According to the shareholders’ resolution dated August 13, 2013, the first possible redemption dates of the Company’s Series B, B-1 and B-2 preferred shares were amended to January 1, 2014, respectively.

There was no consideration given to the holders of the Series B, B-1 and B2 preferred shares for the modification of the first possible redemption dates. Based on the assessment the Company performed, the modification for the first possible redemption dates was not involved the transfer of wealth between ordinary shares, Series A and Series B, B-1 and B-2 preferred shares as the modification was viewed as a pre-condition agreed by the holders of ordinary and preferred shares for the Company’s initial public offering.

The aggregate amount of redemption for all issued redeemable preferred shares each year for the five years following December 31, 2012 is $48,400, respectively.

Accretion

In accordance with authoritative guidance and consistent with the accounting for Series B, B-1 and B-2 convertible preferred shares, the carrying value of the Series B, B-1 and B-2 convertible preferred shares is adjusted for accretion to the redemption price over the period from the date of issuance to the first possible redemption date using the effective interest rate method. Before August 13, 2013, when the shareholders approved the modification of the first possible redemption dates of the Company’s Series B, B-1 and B-2 to January 1, 2014, the carrying value of the Series B, B-1 and B-2 convertible preferred shares had already been accreted to the redemption price over the period from the date of issuance to the original fist possible redemption date (June 19, 2011 for Series B and B-1 and June 1, 2013 for Series B-2), respectively. The modification of the first possible redemption date has no impact on the accretion to Series B, B1 and B2’s redemption value.

For the three months and nine months ended September 30, 2012 and 2013, the accretion to the carrying value of convertible preferred shares was summarized as follows:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2013		2012		2013		2012
	(unaudited)		(unaudited)		(unaudited)		(unaudited)
Series B-2		—	$	14	$	23	$	42

Upon completion of the initial public offering of the Company on October 1, 2013, Series A, B, B1and B2 Preferred Shares automatically converted into 16,163,598 ordinary shares.

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Segment and Geographic Information - Summary of Company's Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue, Major Customer [Line Items]
Revenue	$ 30,056	$ 20,601	$ 75,448	$ 54,538
Hong Kong [Member]
Revenue, Major Customer [Line Items]
Revenue	27,618	18,421	68,404	50,002
Asia Pacific [Member]
Revenue, Major Customer [Line Items]
Revenue	960	912	2,782	1,236
United States [Member]
Revenue, Major Customer [Line Items]
Revenue	785	1,008	2,655	2,644
Europe [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 693	$ 260	$ 1,607	$ 656

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Acquired Intangible Assets, Net

9 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Acquired Intangible Assets, Net

7. Acquired Intangible Assets, Net

Acquired intangible assets, net consist of the following:

	As of September 30, 2013			As of December 31, 2012
Assembled workforce (1)	$	1,900		$	1,900
Technology Licenses		116			150
Software		265			—
Montage Macao License (2)		129			—
Less: accumulated amortization		(1,390	)		(554	)
	$	1,020		$	1,496

For the three months ended September 30, 2013 and 2012 and nine months ended September 30, 2013 and 2012, the Company recorded amortization expense of $324, $124, $986 and $162, respectively.

(1) Assembled workforce

On August 23, 2012, Montage Technology Hong Kong Limited, a wholly owned subsidiary of the Company, entered into agreements with a third party to acquire a research and development workforce, intellectual property (“IP”) and computers and office equipment for total cash consideration of $2,016. The acquisition has been completed in September 2012. The Company determined that the acquisition of research and development workforce, IP and computers and office equipment should be accounted for an asset acquisition as the group of assets acquired by the Company did not meet the definition of a business as pursuant to ASC 805. The Company allocated the total consideration to the acquired research and development workforce, IP (which was obsolete) and computers and office equipment with the amount of $1,900, $0 and $116, respectively, on the acquisition date. The research and development workforce is recorded as assembled workforce and amortized on a straight line basis over 18 months as the Company expected the acquired workforce to provide economic benefit to the Company during this period based on the Company’s prior experience in developing research and development workforce and conducting research and development activities.

(2) Montage Macao license

The Company entered into a memorandum of understanding to acquire Sonoma Commercial Offshore, Ltd, a Macao Offshore Company, which was subsequently renamed Montage Technology Commercial Offshore Limited (“Montage Macao”), to be the principal entity in the Company’s international corporate structure. The acquisition of Montage Macao was completed in May 2013 when Montage Macao completed its registration with the Macao government and the Company took control over Montage Macao. Montage Macao did not have any assets or liabilities other than a qualification license as a commercial offshore entity in Macao. The Company determined that the acquisition of Montage Macao shall be accounted for as an asset acquisition of its commercial offshore license qualification in Macao as it did not meet the definition of a business as pursuant to ASC 805-20-20 and ASC 805-10-55-4 through 805-10-55-9. The useful life of the commercial offshore license qualification in Macao is indefinite as long as the Company maintains its offshore business in Macao. Therefore, the acquisition cost of $129 for the commercial offshore license is not amortized and shall be tested for impairment annually or more frequently if events or changes in circumstances indicate that the commercial offshore license might be impaired pursuant to ASC 350-30-35-18 through 35-20.

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Net Income Per Share

9 Months Ended

Sep. 30, 2013

Earnings Per Share [Abstract]

Net Income Per Share

2. Net Income Per Share

The following shows the computation of basic and diluted net income per ordinary share:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Numerator
Net income	$	8,041		$	6,365		$	16,813		$	14,594
Less: Accretion for preferred shares		—			(14	)		(23	)		(42	)
Less: Allocation of net income to participating preferred shares and restricted shares		(6,460	)		(5,194	)		(13,651	)		(12,038	)
Numerator for basic calculation		1,581			1,157			3,139			2,514
Undistributed earnings re-allocated to ordinary share holders		455			397			926			847
Numerator for diluted calculation	$	2,036		$	1,554		$	4,065		$	3,361
Denominator
Denominator for basic calculation, weighted-average number of shares of ordinary share outstanding		4,658,034			4,321,144			4,618,302			4,303,135
Dilutive effect of share option		1,860,216			2,070,108			1,926,644			1,991,931
Dilutive effect of restricted shares and awards		9,121			—			12,422			—
Denominator for diluted calculation		6,527,371			6,391,252			6,557,368			6,295,066
Net income per share
Basic	$	0.34		$	0.27		$	0.68		$	0.58
Diluted	$	0.31		$	0.24		$	0.62		$	0.53

The Company’s preferred shares were participating securities and as such were included in the calculation of basic net income per share under the two-class method pursuant to ASC 260-10-45-60A and 60-B for all periods presented. In addition, the Company granted 317,120 restricted shares in April 2013 with non-forfeitable dividend rights and the holders of these restricted shares are entitled to cash dividends with respect to the restricted shares subject to the award even though such shares are not vested (Note 12). Therefore, pursuant to ASC 260-10-45-61A, these restricted shares are participating securities and related unvested restricted shares are included in the computation of basic net income per share under the two-class method.

For the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012, under the two-class method for the calculation of net income per share, the noncumulative dividends of 8% of the original issuance price for each series of preferred share were $865, $865, $2,594 and $2,594, respectively, whereas the remaining undistributed earnings attributable to preferred shares on as-if converted basis and restricted shares were $5,595, $4,329, $11,057 and $9,444, respectively.

For the diluted net income per share calculation, the net income allocated to participating preferred shares and unrestricted shares decreased by $455, $397, $926 and $847, respectively for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012, due to the inclusion of incremental shares for share options and restricted shares which have a dilutive impact on the basic net income per share.

The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share because including them would be anti-dilutive as of the end of each period presented:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Convertible preferred shares		16,163,598		16,163,598		16,163,598		16,163,598

The following table sets forth potential shares of ordinary shares that are not included in the calculation of diluted net income per share for the corresponding periods because the number of shares calculated based on the assumed proceeds from exercise of the equity awards and the weighted average fair value of the Company’s ordinary shares is higher than the number of shares assumed to be issued under the awards:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Equity awards outstanding		1,768,960		403,520		1,726,480		417,120

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Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Property Plant And Equipment [Abstract]
Office and other equipment	$ 3,862	$ 3,193
Furniture and fixtures	663	475
Leasehold improvements	1,665	1,354
Property and equipment, gross	6,190	5,022
Less: accumulated depreciation and amortization	(3,731)	(2,738)
Property and equipment, net	$ 2,459	$ 2,284

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Fair Market Value of Financial Instruments - Summary of Financial Instruments, Measured at Fair Value by Level within Fair Value Hierarchy (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	$ 47,624	$ 28,052
Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	27,414	12,175
Bank Investment Product Readily Convertible Within the Maturity Term Below 3 Months [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	9,759
Time Deposit Within the Maturity Term Below 3 Months [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	4,008	9,405
Time Deposit With the Maturity Term Greater Than 3 Months but Less Than 1 Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	50
Short-Term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	6,393	6,472
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	31,472	21,580
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	27,414	12,175
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Time Deposit Within the Maturity Term Below 3 Months [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	4,008	9,405
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Time Deposit With the Maturity Term Greater Than 3 Months but Less Than 1 Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	50
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	16,152	6,472
Significant Other Observable Inputs (Level 2) [Member] | Bank Investment Product Readily Convertible Within the Maturity Term Below 3 Months [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	9,759
Significant Other Observable Inputs (Level 2) [Member] | Short-Term Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments, measured at fair value	$ 6,393	$ 6,472

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Restricted Net Assets - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 PRC [Member]	Dec. 31, 2012 PRC [Member]
Restricted Net Assets [Line Items]
Percentage of profit after-tax kept into general reserves, Minimum	10.00%
Percentage of profit after-tax kept into general reserves to reach cumulative amount of paid-in capital	50.00%
Approximate amount of restricted portion of net assets		$ 10,749	$ 10,749

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Acquired Intangible Assets, Net (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Acquired Intangible Assets, Net

Acquired intangible assets, net consist of the following:

	As of September 30, 2013			As of December 31, 2012
Assembled workforce (1)	$	1,900		$	1,900
Technology Licenses		116			150
Software		265			—
Montage Macao License (2)		129			—
Less: accumulated amortization		(1,390	)		(554	)
	$	1,020		$	1,496

(1) Assembled workforce

On August 23, 2012, Montage Technology Hong Kong Limited, a wholly owned subsidiary of the Company, entered into agreements with a third party to acquire a research and development workforce, intellectual property (“IP”) and computers and office equipment for total cash consideration of $2,016. The acquisition has been completed in September 2012. The Company determined that the acquisition of research and development workforce, IP and computers and office equipment should be accounted for an asset acquisition as the group of assets acquired by the Company did not meet the definition of a business as pursuant to ASC 805. The Company allocated the total consideration to the acquired research and development workforce, IP (which was obsolete) and computers and office equipment with the amount of $1,900, $0 and $116, respectively, on the acquisition date. The research and development workforce is recorded as assembled workforce and amortized on a straight line basis over 18 months as the Company expected the acquired workforce to provide economic benefit to the Company during this period based on the Company’s prior experience in developing research and development workforce and conducting research and development activities.

(2) Montage Macao license

The Company entered into a memorandum of understanding to acquire Sonoma Commercial Offshore, Ltd, a Macao Offshore Company, which was subsequently renamed Montage Technology Commercial Offshore Limited (“Montage Macao”), to be the principal entity in the Company’s international corporate structure. The acquisition of Montage Macao was completed in May 2013 when Montage Macao completed its registration with the Macao government and the Company took control over Montage Macao. Montage Macao did not have any assets or liabilities other than a qualification license as a commercial offshore entity in Macao. The Company determined that the acquisition of Montage Macao shall be accounted for as an asset acquisition of its commercial offshore license qualification in Macao as it did not meet the definition of a business as pursuant to ASC 805-20-20 and ASC 805-10-55-4 through 805-10-55-9. The useful life of the commercial offshore license qualification in Macao is indefinite as long as the Company maintains its offshore business in Macao. Therefore, the acquisition cost of $129 for the commercial offshore license is not amortized and shall be tested for impairment annually or more frequently if events or changes in circumstances indicate that the commercial offshore license might be impaired pursuant to ASC 350-30-35-18 through 35-20.

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Pro Forma Balance Sheet and Net Income per Share for Conversion of Preferred Shares (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Actual net income attributable to ordinary shareholders	$ 1,581	$ 1,157	$ 3,139	$ 2,514
Pro-forma effect of preferred shares	6,460		13,674
Net income	$ 8,041	$ 6,365	$ 16,813	$ 14,594
Actual weighted average number of ordinary shares outstanding
Basic	4,658,034	4,321,144	4,618,302	4,303,135
Diluted	6,527,371	6,391,252	6,557,368	6,295,066
Pro-forma effect of preferred shares	16,163,598		16,163,598
Denominator for pro-forma basic and diluted calculation
Basic	20,821,632		20,781,900
Diluted	22,690,969		22,720,966
Pro-forma basic and diluted net income per share attributable to ordinary shareholders
Basic	$ 0.39		$ 0.81
Diluted	$ 0.35		$ 0.74

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Share-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended				9 Months Ended	12 Months Ended	9 Months Ended				0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 2006 Share Incentive Plan [Member]	Dec. 31, 2012 2006 Share Incentive Plan [Member]	Sep. 30, 2013 Early Exercise of Employee Share Options [Member] Installment	Dec. 31, 2012 Early Exercise of Employee Share Options [Member]	Sep. 30, 2013 Share Options [Member]	Sep. 30, 2013 2013 Performance Incentive Plan [Member]	Sep. 30, 2013 Share Options [Member]	Sep. 30, 2013 Non-Employee Stock Option [Member]	Apr. 23, 2013 Restricted Share Awards [Member]	Sep. 30, 2013 Restricted Share Awards [Member]	Sep. 30, 2013 Restricted Share Awards [Member] 2006 Share Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period									4 years			4 years
Expiry period from date of grant									10 years
Vesting percentage					25.00%							25.00%
Number of ordinary shares authorized under equity award issuance plan			6,566,544	6,566,544				1,600,000
Incentive plan description	Share options granted vest over a maximum period of four years and expire ten years from the date of the grant. Share options generally vest over four years, one-quarter on the first anniversary of the date of the grant and monthly thereafter for the remaining three years. RSAs have various vesting periods determined by the plan administrator, and generally vest over four years, with 25% on each of the anniversary of the vesting commence date.							The share limit will automatically increase on the first trading day in January of each year (commencing with January 2014) by an amount equal to the lesser of (1) 4% of the total number of outstanding shares of our ordinary shares on the last trading day in December in the prior year, (2) 1,000,000 shares, or such lesser number as determined by our board of directors.
Percentage of fair market value of ordinary shares on date of grant	110.00%
Percentage of incentive grant options grant to ownership of ordinary shares	10.00%
Expected term									6 years	10 years
Unvested shares					7,500	0
Options vested, exercisable					36
Cash received from early exercise of options					$ 8	$ 0
Total fair value for stock options vested							1,100
Unrecognized compensation cost							13,091						4,698
Expected weighted-average period of compensation cost to be recognized							3 years 8 months 9 days					3 years 11 months 19 days
Number of restricted shares, granted											317,120	330,620
Estimated fair value of RSA												$ 17.98
Share-based compensation expense	$ 2,462	$ 682										$ 504

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Accrued Liabilities - Schedule of Accrued Liabilities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Payables And Accruals [Abstract]
Government funding deduction to expense		$ 1,025	$ 396	$ 1,025
Government funding for research and development projects	$ 3,893		$ 3,893		$ 3,055

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Segment and Geographic Information

9 Months Ended

Sep. 30, 2013

Segment Reporting [Abstract]

Segment and Geographic Information

14. Segment and Geographic Information

The Company operates in one segment related to the design, development and sale of high performance, low power semiconductors for the home entertainment and cloud computing markets. The Company’s chief operating decision maker is its chief executive officer, who reviews the Company’s operating results on an aggregate basis for the purpose of evaluating financial performance and allocating resources.

The following table sets forth the Company’s revenue by geographic region:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Hong Kong	$	27,618	$	18,421	$	68,404	$	50,002
Asia Pacific		960		912		2,782		1,236
United States		785		1,008		2,655		2,644
Europe		693		260		1,607		656
	$	30,056	$	20,601	$	75,448	$	54,538

As of September 30, 2013, substantially all of the Company’s long-lived tangible assets were located in the Asia Pacific region.

The following table sets forth the Company’s revenue generated from sales of semiconductors solutions for the home entertainment and cloud computing markets:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Home entertainment	$	27,255	$	18,649	$	68,371	$	50,614
Cloud Computing market		2,801		1,952		7,077		3,924
	$	30,056	$	20,601	$	75,448	$	54,538

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Deferred Margin, Net

9 Months Ended

Sep. 30, 2013

Revenue Recognition [Abstract]

Deferred Margin, Net

10. Deferred Margin, Net

Deferred margin, net consists of the following:

	As of September 30, 2013			As of December 31, 2012
Deferred revenue	$	20,146		$	15,878
Deferred cost of revenue		(18,601	)		(14,678	)
	$	1,545		$	1,200

The deferred revenue and deferred cost of revenue on sales to distributor activities for the nine months ended September 30, 2013 and 2012 were as follows:

	Nine Months Ended September 30,
	2013			2012
Balance at the beginning of the period	$	1,200		$	5,147
Revenue deferred upon shipment to distributors		33,847			27,734
Cost of sales deferred upon shipments to distributors		(26,952	)		(18,509	)
Revenue recognized upon resale from distributors to end customers		(29,126	)		(26,295	)
Cost of sales recognized upon resale from distributors to end customers		23,029			13,126
Price adjustments to distributors		(453	)		(195	)
Balance at the end of the period	$	1,545			1,008

The following table shows reconciliation from revenue recognized upon resale from distributors to end customers as included in the above table to revenue recorded in the consolidated statements of operations and comprehensive income for the three months ended September 30, 2013 and 2012 and the nine months ended September 30, 2013 and 2012:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Revenue recognized upon resale from distributors to end customers (through deferred revenue)	$	12,063	$	7,842	$	29,126	$	26,295
Revenue recognized upon resale from LQW to end customers (recorded directly in revenue)*		15,136		9,171		38,115		17,998
Revenue recognized for the Company’s sales directly to end customer		2,857		3,588		8,207		10,245
Total	$	30,056	$	20,601	$	75,448	$	54,538

* LQW has been a distributor for the Company’s products since October 2011. The Company is entitled to bill only a portion of the total sale price at the time of shipment (deferred revenue), with the remainder billed upon sale by LQW to the end customer. The portion of the total sale price that the Company is not entitled to bill at the time of shipment to LQW is recorded directly in revenue upon sale by LQW to the end customers.

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Share-Based Compensation - Summary of Stock Options Granted and Outstanding Under 2006 Share Incentive Plan (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning Balance	2,734,688
Number of Shares, Granted	1,330,760
Number of Shares, Exercised	263,667
Number of Shares, Forfeited	26,019
Number of Shares, Canceled	4,669
Number of Shares, Outstanding, Ending Balance	3,771,093
Number of Shares, Exercisable at September 30, 2013	3,146,996
Number of Shares, Vested at September 30, 2013	1,883,245
Number of Shares, Vested and expected to vest at September 30, 2013	3,611,003
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 2.40
Weighted Average Exercise Price, Granted	$ 17.68
Weighted Average Exercise Price, Exercised	$ 0.30
Weighted Average Exercise Price, Forfeited	$ 10.64
Weighted Average Exercise Price, Canceled	$ 0.99
Weighted Average Exercise Price, Outstanding, Ending balance	$ 7.89
Weighted Average Exercise Price, Exercisable at September 30, 2013	$ 7.21
Weighted Average Exercise Price, Vested at September 30, 2013	$ 1.34
Weighted Average Exercise Price, Vested and expected to vest at September 30, 2013	$ 7.54
Weighted Average Remaining Contractual Life, Outstanding at September 30, 2013	7 years
Weighted Average Remaining Contractual Life, Exercisable at September 30, 2013	6 years 7 months 10 days
Weighted Average Remaining Contractual Life, Vested at September 30, 2013	4 years 8 months 27 days
Weighted Average Remaining Contractual Life, Vested and expected to vest at September 30, 2013	6 years 10 months 21 days
Aggregate Intrinsic Value, Outstanding at September 30, 2013	$ 28,412
Aggregate Intrinsic Value, Exercisable at September 30, 2013	25,571
Aggregate Intrinsic Value, Vested at September 30, 2013	24,225
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2013	$ 28,202

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2.5-for-1 Reverse Share Split

9 Months Ended

Sep. 30, 2013

Equity [Abstract]

2.5-for-1 Reverse Share Split

17. 2.5-for-1 Reverse Share Split

On September 6, 2013, the Company’s shareholders approved and effected a reverse share split such that every 2.5 issued and unissued ordinary and preferred shares of par value US$0.005 were consolidated into one share with a par value of US$0.0125 each. All share-related disclosures, including par value, share price, number of ordinary shares, preferred shares, share options, restricted shares, and warrants, exercise price of share options, restricted shares, and warrants and related fair value per share, and net income per share calculations, have been recast to reflect the 2.5-for-1 reverse share split for all periods presented.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

15. Commitments and Contingencies

Future minimum lease payment under noncancelable operating leases having initial terms in excess of one year as of September 30, 2013 are as follows:

	Payment Due by Period
	Total		Less than 1 Year		1 - 3 Years		3 - 5 Years
	(in thousands)
Operating lease obligations	$	2,461	$	315	$	1,877	$	269
Purchase obligations		1,670		1,670		—		—
Total contractual obligations	$	4,131	$	1,985	$	1,877	$	269

As of September 30, 2013 and December 31, 2012, there was no unsettled or unasserted claim or litigation against the Company. Rent expense incurred under operating leases was $352 and $234 for the three months ended September 30, 2013 and 2012 and $917 and $517 for the nine months ended September 30, 2013 and 2012, respectively.

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Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 08, 2013
Document And Entity Information [Abstract]
Document Type	10-Q/A
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Entity Registrant Name	MONTAGE TECHNOLOGY GROUP LTD
Entity Central Index Key	0001375514
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		26,476,143

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Off-Balance Sheet Arrangements

9 Months Ended

Sep. 30, 2013

Text Block [Abstract]

Off-Balance Sheet Arrangements

16. Off-Balance Sheet Arrangements

As of September 30, 2013 and December 31, 2012, the Company did not have any transactions, obligations or relationships that could be considered off-balance sheet arrangements.

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Deferred Margin, Net - Deferred Revenue and Deferred Cost of Revenue on Sales to Distributor (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Deferred Revenue Disclosure [Abstract]
Balance at the beginning of the period	$ 1,200	$ 5,147
Revenue deferred upon shipment to distributors	33,847	27,734
Cost of sales deferred upon shipments to distributors	(26,952)	(18,509)
Revenue recognized upon resale from distributors to end customers	(29,126)	(26,295)
Cost of sales recognized upon resale from distributors to end customers	23,029	13,126
Price adjustments to distributors	(453)	(195)
Balance at the end of the period	$ 1,545	$ 1,008

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Deferred Margin, Net - Components of Deferred Margin, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Deferred Revenue Disclosure [Abstract]
Deferred revenue	$ 20,146	$ 15,878
Deferred cost of revenue	(18,601)	(14,678)
Deferred margin, net	$ 1,545	$ 1,200	$ 1,008	$ 5,147