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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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