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Discontinued Operations - Summary of Operating Results Related to Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Discontinued Operations And Disposal Groups [Abstract] |  |  |  |
Product revenue | $ 703 | $ 731 | $ 2,671 | $ 2,689
License revenue |  |  | 1,000 |
Total revenues |  |  | 3,671 | 2,689
Cost of revenues | 659 | 579 | 2,373 | 2,543
Gross profit | 44 | 152 | 1,298 | 146
Operating expenses: |  |  |  |
Research and development | 420 | 1,104 | 3,099 | 6,605
Sales and marketing | 314 | 384 | 1,375 | 2,252
General and administrative | 145 | 146 | 760 | 894
Total operating expenses | 879 | 1,634 | 5,234 | 9,751
Operating loss | (835) | (1,482) | (3,936) | (9,605)
Other income (expense) | 149 | 352 | 180 | 13
Loss from discontinued operations | $ (686) | $ (1,130) | $ (3,756) | $ (9,592)

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