Supplementary Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2021

Balance Sheet Related Disclosures [Abstract]

Schedule of Property and Equipment

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

	September 30, 2021			December 31, 2020
Lab equipment	$	7,475		$	5,730
Leasehold improvements		2,037			1,845
Computer equipment		871			871
Furniture and fixtures		424			424
Software		655			651
Vehicles		97			—
Construction in process		268			381
		11,827			9,902
Less: accumulated depreciation		(7,395	)		(6,724	)
Total property and equipment, net	$	4,432		$	3,178

Schedule of Intangible Assets, Excluding Goodwill

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

	September 30, 2021							December 31, 2020
	Cost		Accumulated Amortization			Net Carrying Value		Cost		Accumulated Amortization			Net Carrying Value
Intangible assets subject to amortization
Patents	$	1,667	$	(550	)	$	1,117	$	1,474	$	(494	)	$	980
Purchased technology		16,900		(6,102	)		10,798		16,900		(4,694	)		12,206
Intangible assets not subject to    amortization
Trademarks		77		—			77		74		—			74
Total	$	18,644	$	(6,652	)	$	11,992	$	18,448	$	(5,188	)	$	13,260

Schedule of Future Estimated Amortization Expense of Intangible Assets

	As of
	September 30, 2021
Remainder of 2021	$	490
2022		1,959
2023		1,955
2024		1,948
2025		1,944
2026 and thereafter		3,619
Total	$	11,915

Schedule of Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

	September 30, 2021		December 31, 2020
Compensation related accruals	$	2,624	$	3,975
Accrued clinical trial expense		909		715
Other expenses		2,746		3,099
Total accrued liabilities	$	6,279	$	7,789