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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 6,588	$ 1,880	$ 9,308	$ (8,455)
Weighted-average shares outstanding — basic (in shares)	38,970	37,250	38,804	37,046
Effect of dilutive securities from stock award plans (in shares)	1,030	1,120	1,050	0
Weighted-average shares outstanding — diluted (in shares)	40,000	38,370	39,854	37,046
Net income (loss) per share - basic (in dollars per share)	$ 0.17	$ 0.05	$ 0.24	$ (0.23)
Net income (loss) per share - diluted (in dollars per share)	$ 0.16	$ 0.05	$ 0.23	$ (0.23)
Anti-dilutive weighted-average shares related to stock award plans (in shares)	1,264	2,121	1,249	4,039

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