Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net loss	$ (12,414)	$ (8,220)
Available-for-sale investments
Net change in unrealized gain (loss) on available-for-sale investments		6
Less: Reclassification adjustment for losses on investments recognized during the period	61
Net change in unrealized gain (loss) on available-for-sale investments	61	6
Other comprehensive gain (loss), net of tax	61	6
Comprehensive loss	$ (12,353)	$ (8,214)