Stockholders' Equity and Stock-Based Compensation - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member]	3 Months Ended
	Mar. 31, 2018 $ / shares shares
Activity for RSUs [Roll Forward]
Number of units Beginning balance (in shares) | shares	790,299
Number of units, Granted (in shares) | shares	109,007
Number of units, Released (in shares) | shares	(84,942)
Number of units, Cancelled (in shares) | shares	(42,668)
Number of units, Ending balance (in shares) | shares	771,696
Weighted Average Fair Value for RSUs [Roll Forward]
Weighted Average Fair Value, Beginning balance (in dollars per share) | $ / shares	$ 22.46
Weighted Average Fair Value, Granted (in dollars per share) | $ / shares	26.58
Weighted Average Fair Value, Released (in dollars per share) | $ / shares	18.88
Weighted Average Fair Value, Cancelled (in dollars per share) | $ / shares	22.15
Weighted Average Fair Value, Ending balance (in dollars per share) | $ / shares	$ 23.45