Stock-based Compensation Stock-based Compensation - Schedule of Stock Options Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
NUMBER OF SHARES
Options outstanding at beginning of year (in shares) | shares	4,583,586
Granted (in shares) | shares	993,836
Exercised (in shares) | shares	(166,295)
Canceled (in shares) | shares	(155,197)
Options outstanding at end of year (in shares) | shares	5,255,930
Options vested or expected to vest (in shares) | shares	5,198,266
Options exercisable at end of year (in shares) | shares	3,276,694
WEIGHTED AVERAGE EXERCISE PRICE
Options outstanding at beginning of year, weighted average exercise price (in dollars per share) | $ / shares	$ 12.86
Granted (in dollars per share) | $ / shares	20.51
Exercised (in dollars per share) | $ / shares	5.71
Canceled (in dollars per share) | $ / shares	19.33
Options outstanding at end of year, weighted average exercise price (in dollars per share) | $ / shares	14.34
Options vested and expected to vest (in dollars per share) | $ / shares	14.25
Options exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 10.77
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Options outstanding (in years)	7 years 4 months 39 days
Options vested and expected to vest (in years)	7 years 4 months 35 days
Options exercisable (in years)	6 years 10 months 5 days
AGGREGATE INTRINSIC VALUE
Options outstanding | $	$ 123,649
Options vested and expected to vest | $	122,751
Options exercisable | $	$ 88,745