Discontinued Operations - Summary of Major Classes of Items Constituting Income (Loss) from Discontinued Operations in Condensed Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total net revenues	$ 2,600	$ 4,146
Total cost of revenues	2,290	3,311
Gross income	310	835
Total operating expenses	1,498	1,494
Operating loss	(1,188)	(659)
Interest income (expense), net	(94)	(66)
Loss from discontinued operations	(1,282)	(725)
Gain on sale of business	3,473
Income (loss) from discontinued operations	2,191	(725)
Service and Other [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total net revenues	1,748	2,992
Total cost of revenues	1,089	1,789
Selling, General And Administrative [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total operating expenses	1,110	1,440
Research And Development [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total operating expenses	388	54
Product Sales [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Total net revenues	852	1,154
Total cost of revenues	$ 1,201	$ 1,522