Consolidated Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2020

Consolidated Balance Sheets And Statements Of Operations Components Disclosure [Abstract]

Schedule of Inventories/Prepaid/PP&E

	December 31,
	2020			2019
	(in thousands)
Inventories:
Work-in-process	$	414		$	746
Finished goods		185			222
	$	599		$	968
Prepaid expenses and other:
Prepaid inventory and production costs	$	422		$	174
Prepaid insurance		144			122
Prepaid software		18			24
Refundable tax		—			61
Other		84			91
	$	668		$	472
Property and equipment, net:
Equipment, furniture and fixtures and leasehold    improvements	$	4,265		$	4,239
Acquired software		129			123
		4,394			4,362
Less: Accumulated depreciation and amortization		(4,273	)		(4,165	)
	$	121		$	197

Schedule of accrued expenses and other

	December 31,
	2020		2019
	(in thousands)
Accrued wages and employee benefits	$	313	$	296
Professional fees, legal and consulting		690		229
IC development and wafer purchases		—		104
Warranty accrual		41		63
Interest payable		93		84
Corporate taxes		18		20
Other		145		359
	$	1,300	$	1,155