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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Total revenues $ 901 $ 3,671
Cost of revenue 857 2,373
Gross profit 44 1,298
Operating expenses:    
Research and development 656 3,099
Sales and marketing 411 1,375
General and administrative 185 760
Total operating expenses 1,252 5,234
Operating loss (1,208) (3,936)
Other income (expense) 112 180
Loss from discontinued operations (1,096) (3,756)
Loss from sale of business (6,508) (36)
Net loss from discontinued operations (7,604) (3,756)
Product revenue [Member]    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Total revenues $ 901 2,671
License revenue [Member]    
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]    
Total revenues   $ 1,000