CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,041	$ (761)	$ 4,304	$ (1,542)
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(76)	215	194	(171)
Unrealized gains on available-for-sale securities:
Unrealized gains (losses)	15	(25)	68	(6)
Reclassification adjustment	0	0	0	0
Total unrealized gains (losses) on available-for-sale securities	15	(25)	68	(6)
Unrealized gains (losses) on foreign exchange forward contracts:
Unrealized gains (losses)	(7)	123	53	(105)
Reclassification adjustment for losses included in net income (loss)	5	124	36	306
Total unrealized gains (losses) on foreign exchange forward contracts	(2)	247	89	201
Other comprehensive income (loss), before tax	(63)	437	351	24
Income tax provision related to items of other comprehensive income (loss)	0	0	0	0
Other comprehensive income (loss), net of tax	(63)	437	351	24
Total comprehensive income (loss)	$ 1,978	$ (324)	$ 4,655	$ (1,518)