Consolidated Statements of Comprehensive Income (loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 963	$ (17,851)
Other comprehensive income:
Unrealized gain on investments, net of taxes	1	10
Unrealized gain on currency translation		17
Other comprehensive income	1	27
Comprehensive income (loss)	$ 964	$ (17,824)