Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (17,980)	$ (9,674)	$ (10,897)
Other comprehensive loss, net:
Change in unrealized gain (loss) on investments, net of tax	622	(252)	(122)
Comprehensive loss	$ (17,358)	$ (9,926)	$ (11,019)