Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ 4,161	$ 298	$ (9,777)	$ (16,294)
Other comprehensive loss, net:
Change in unrealized gain on investments, net of tax	(188)	37	662	756
Comprehensive income (loss)	$ 3,973	$ 335	$ (9,115)	$ (15,538)