Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (352)	$ 710	$ (1,132)	$ 820
Other comprehensive income (loss):
Unrealized gain on investments, net of tax		(2)	2	(1)
Other comprehensive income (loss)		(2)	2	(1)
Comprehensive income (loss)	$ (352)	$ 708	$ (1,130)	$ 819