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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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