Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)	$ 6,188	$ 1,644	$ 7,113	$ (1,636)
Available-for-sale investments
Net change in unrealized gains (losses) on available-for-sale investments	5	(24)	13	56
Less: Reclassification adjustment for gains on investments recognized during the period		(1)	(4)	(1)
Net change in unrealized gain and losses on available-for-sale investments	5	(25)	9	55
Tax provision (benefit)		(9)		20
Other comprehensive income (loss), net of tax	5	(16)	9	35
Comprehensive income (loss)	$ 6,193	$ 1,628	$ 7,122	$ (1,601)