Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (836)	$ 150	$ (780)	$ 110
Other comprehensive income (loss):
Unrealized gain on investments, net of tax	21	1	3	1
Other comprehensive income	21	1	3	1
Comprehensive income (loss)	$ (815)	$ 151	$ (777)	$ 111