Balance Sheet Components (Tables)

9 Months Ended

Sep. 27, 2020

Balance Sheet Related Disclosures [Abstract]

Schedule of Cash and Cash Equivalents

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Cash and cash equivalents	$	173,619	$	236,680
Restricted cash	4,147		4,139
Total as presented on the unaudited condensed consolidated statements of cash flows	$	177,766	$	240,819

	As of
	September 29, 2019		December 31, 2018
	(In thousands)
Cash and cash equivalents	$	113,870	$	151,290
Restricted cash	4,130		4,134
Total as presented on the unaudited condensed consolidated statements of cash flows	$	118,000	$	155,424

Schedule of Restricted Cash

The following table provides a reconciliation of cash and cash equivalents and restricted cash reported within the balance sheets that sum to the total of the same amounts shown on the statements of cash flows:

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Cash and cash equivalents	$	173,619	$	236,680
Restricted cash	4,147		4,139
Total as presented on the unaudited condensed consolidated statements of cash flows	$	177,766	$	240,819

	As of
	September 29, 2019		December 31, 2018
	(In thousands)
Cash and cash equivalents	$	113,870	$	151,290
Restricted cash	4,130		4,134
Total as presented on the unaudited condensed consolidated statements of cash flows	$	118,000	$	155,424

Schedule of Available-For-Sale Short-Term Investments

Available-for-sale short-term investments

	As of September 27, 2020								As of December 31, 2019
	Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value		Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
	(In thousands)
U.S. treasuries	$	19,992	$	—	$	—	$	19,992	$	19,967	$	23	$	—	$	19,990

Schedule of Accounts Receivable, Net

Accounts receivable, net

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Gross accounts receivable	$	56,940	$	127,926
Allowance for credit losses	(509)		(609)
Total accounts receivable, net	$	56,431	$	127,317

Summary of Allowance for Credit Losses, Accounts Receivable

The following table provides a roll-forward of the allowance for credit losses that is deducted from the amortized cost basis of accounts receivable to present the net amount expected to be collected.

	Three Months Ended		Nine Months Ended
	September 27, 2020		September 27, 2020
	(In thousands)
Balance at the beginning of the period	$	810	$	609
Provision for (recovery of) expected credit losses	(301)		(100)
Amounts written off charged against the allowance	—		—
Balance at the end of the period	$	509	$	509

Schedule of Property and Equipment, Net

Property and equipment, net

The components of property and equipment are as follows:

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Machinery and equipment	$	14,699	$	13,402
Software	12,657		11,945
Computer equipment	4,094		4,047
Furniture and fixtures	4,045		4,075
Leasehold improvements	8,023		8,087
Total property and equipment, gross	43,518		41,556
Accumulated depreciation and amortization	(26,686)		(20,204)
Total property and equipment, net	$	16,832	$	21,352

Schedule of Intangibles, Net

Intangibles, net

	As of September 27, 2020						As of December 31, 2019
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
	(In thousands)
Technology	$	9,800	$	(9,571)	$	229	$	9,800	$	(8,540)	$	1,260
Other	500		(491)		9		500		(454)		46
Total intangibles, net	$	10,300	$	(10,062)	$	238	$	10,300	$	(8,994)	$	1,306

Schedule of Other Non-Current Assets

Other non-current assets

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Non-current deferred income taxes	$	1,255	$	1,318
Deposits	122		764
Other	839		1,926
Total other non-current assets	$	2,216	$	4,008

Schedule of Accrued Liabilities

Accrued liabilities

	As of
	September 27, 2020		December 31, 2019
	(In thousands)
Sales and marketing	$	37,767	$	53,974
Sales returns	25,193		28,817
Accrued employee compensation	9,751		11,795
Current operating lease liabilities	4,376		3,912
Warranty obligation	2,568		3,169
Freight	2,675		2,690
Other	23,697		23,043
Total accrued liabilities	$	106,027	$	127,400