Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Gross Unrealized Gains and Unrealized Losses of Investment Securities Excluding Investments in Money Market Funds

The following is a summary of the gross unrealized gains and unrealized losses on the Company’s investment securities, excluding investments in money market funds (in thousands):

	March 31, 2020
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Investment Securities
Agency bonds	$	12,972	$	95	$	—		$	13,067
Commercial paper (i)		74,354		10		(1	)		74,363
Corporate notes (i)		83,155		40		(152	)		83,043
Total securities	$	170,481	$	145	$	(153	)	$	170,473

	December 31, 2019
	Amortized Cost		Gross Unrealized Holding Gains		Gross Unrealized Holding Losses			Aggregate Fair Value
Investment Securities
Agency bonds	$	17,209	$	37	$	—		$	17,246
Commercial paper	$	12,425	$	24	$	—			12,449
Corporate notes		142,588		150		(4	)		142,734
Total securities	$	172,222	$	211	$	(4	)	$	172,429

(i) Includes $50.0 million of commercial paper and $9.3 million of corporate notes that is classified as cash and cash equivalents on the condensed consolidated balance sheets.

Summary of Contractual Maturities of Investment Securities

The contractual maturities of the Company’s investment securities as of March 31, 2020 were as follows (in thousands):

	Amortized Cost		Fair Value
Amounts maturing within one year	$	170,481	$	170,473
Amounts maturing after one year through five years		—		—
Total investment securities	$	170,481	$	170,473

Components of Inventories

Inventories (in thousands)

	March 31,		December 31,
	2020		2019
Raw materials	$	22,751	$	26,354
Finished goods		70,232		65,225
Total inventories	$	92,983	$	91,579

Schedule of Property and Equipment, Net and Depreciation and Amortization Expense

Property and Equipment, Net (in thousands)

	March 31,			December 31,
	2020			2019
Laboratory equipment	$	5,841		$	5,733
Computer equipment and software		10,281			9,909
Furniture and fixtures		3,918			3,898
Leasehold improvements		4,226			4,226
Construction in process		1,169			1,006
Total		25,435			24,772
Less: Accumulated depreciation and amortization		(14,274	)		(13,006	)
Property and equipment, net	$	11,161		$	11,766

The Company recognized depreciation and amortization expense on property and equipment as follows (in thousands):

	Three Months Ended
	March 31,
	2020		2019
Depreciation and amortization expense	$	1,296	$	1,085

Summary of Accrued Liabilities

Accrued Liabilities (in thousands)

	March 31,		December 31,
	2020		2019
Accrued payroll and related expenses	$	22,738	$	36,056
Accrued professional fees		2,041		1,633
Accrued taxes		2,117		2,353
Accrued clinical and research expenses		1,716		2,157
Accrued interest		998		243
Accrued warranty		1,192		1,178
Accrued other		6,535		7,346
Total accrued liabilities	$	37,337	$	50,966