Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ (8,139)	$ (2,306)	$ (20,090)	$ (4,621)
Other comprehensive loss:
Unrealized gain (loss) on available-for-sale securities	(2)	(1)	(1)	6
Total comprehensive loss	$ (8,141)	$ (2,307)	$ (20,091)	$ (4,615)