Quarterly report pursuant to Section 13 or 15(d)

Discontinued Operations - Summary of Major Classes of Items Constituting Income (Loss) from Discontinued Operations in Condensed Statements of Operations (Details)

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Discontinued Operations - Summary of Major Classes of Items Constituting Income (Loss) from Discontinued Operations in Condensed Statements of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total net revenues $ 489 $ 847 $ 2,600 $ 2,929
Total cost of revenues 396 851 2,290 2,423
Gross income (loss) 93 (4) 310 506
Total operating expenses 464 257 1,498 1,005
Operating loss (371) (261) (1,188) (499)
Interest expense, net (22) (3) (94) (24)
Loss from discontinued operations (393) (264) (1,282) (523)
Gain on disposition of business 3,473   3,473  
Income (loss) from discontinued operations 3,080 (264) 2,191 (523)
Service and Other [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total net revenues 349 729 1,748 2,259
Total cost of revenues 238 504 1,089 1,296
Selling, General And Administrative [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total operating expenses 330 236 1,110 958
Research And Development [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total operating expenses 134 21 388 47
Product Sales [Member]        
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]        
Total net revenues 140 118 852 670
Total cost of revenues $ 158 $ 347 $ 1,201 $ 1,127