Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Property and Equipment, Net

Property and Equipment, net:

	March 31, 2020		December 31, 2019
	(in thousands)
Machinery and equipment	$	4,999	$	4,613
Construction in progress	1,994		1,854
Computer and office equipment	605		598
Leasehold improvements	502		497
Furniture and fixtures	189		187
	8,289		7,749
Less: Accumulated depreciation and amortization	(4,020)		(3,795)
	$	4,269	$	3,954

Schedule of Accrued Liabilities and Other

Accrued Liabilities and Other:

	March 31, 2020		December 31, 2019
	(in thousands)
Accrued compensation and related expenses	$	4,717	$	7,274
Accrued litigation expense	3,200		3,200
Accrued professional services	571		392
Others	796		739
	$	9,284	$	11,605