Supplementary Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

Property and equipment consist of the following (in thousands):

	March 31, 2021			December 31, 2020
Lab equipment	$	6,292		$	5,730
Leasehold improvements		2,012			1,845
Computer equipment		871			871
Furniture and fixtures		424			424
Software		655			651
Construction in process		115			381
		10,369			9,902
Less accumulated depreciation		(6,982	)		(6,724	)
Total property and equipment, net	$	3,387		$	3,178

Schedule of Intangible Assets, Excluding Goodwill

Intangible assets, excluding goodwill, consist of the following (in thousands):

	March 31, 2021							December 31, 2020
	Cost		Accumulated Amortization			Net Carrying Value		Cost		Accumulated Amortization			Net Carrying Value
Intangible assets subject to amortization
Patents	$	1,525	$	(515	)	$	1,010	$	1,474	$	(494	)	$	980
Purchased technology		16,900		(5,164	)		11,736		16,900		(4,694	)		12,206
Intangible assets not subject to amortization
Trademarks		75		—			75		74		—			74
Total	$	18,500	$	(5,679	)	$	12,821	$	18,448	$	(5,188	)	$	13,260

Schedule of Future Estimated Amortization Expense of Intangible Assets

	As of March 31, 2021
Remainder of 2021	$	1,462
2022		1,945
2023		1,941
2024		1,933
2025		1,929
2026		3,536
Total	$	12,746

Schedule of Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	March 31, 2021		December 31, 2020
Compensation related accruals	$	1,831	$	3,975
Accrued clinical trial expense		791		715
Other expenses		4,640		3,099
Total accrued liabilities	$	7,262	$	7,789