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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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