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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Discontinued Operations And Disposal Groups [Abstract] |  |  |  |
Product revenue | $ 197 | $ 660 | $ 901 | $ 1,391
Costs of revenue | 199 | 630 | 857 | 1,209
Gross profit | (2) | 30 | 44 | 182
Operating expenses: |  |  |  |
Research and development | 237 | 684 | 656 | 1,790
Sales and marketing | 97 | 340 | 411 | 723
General and administrative | 39 | 176 | 185 | 413
Total operating expenses | 373 | 1,200 | 1,252 | 2,926
Operating loss | (375) | (1,170) | (1,208) | (2,744)
Other income (expense) | (5) | (204) | 142 | 148
Loss from discontinued operations | $ (380) | $ (1,374) | $ (1,066) | $ (2,596)

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