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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Discontinued Operations And Disposal Groups [Abstract] |  |  |
Product revenue | $ 858 | $ 901 | $ 2,249
Costs of revenue | 628 | 857 | 1,837
Gross profit | 230 | 44 | 412
Operating expenses: |  |  |
Research and development | 689 | 656 | 2,479
Sales and marketing | 337 | 411 | 1,060
General and administrative | 147 | 185 | 560
Total operating expenses | 1,173 | 1,252 | 4,099
Operating loss | (943) | (1,208) | (3,687)
Other income (expense) | 9 | 140 | 157
Loss from discontinued operations | $ (934) | $ (1,068) | $ (3,530)

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