Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net loss	$ (2,257)	$ (2,628)	$ (26,065)	$ (10,260)
Available-for-sale investments
Net change in unrealized gain (loss) on available-for-sale investments	(2)	1	(2)	10
Less: Reclassification adjustment for (gains) losses on investments recognized during the period	0	0	63	0
Net change in unrealized gain on available-for-sale investments	(2)	1	61	10
Other comprehensive gain (loss), net of tax	(2)	1	61	10
Comprehensive loss	$ (2,259)	$ (2,627)	$ (26,004)	$ (10,250)