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Stockholders' Equity - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Number of Options        
Options outstanding at the beginning of the period (in shares)     2,306  
Options Granted (in shares)     1,380  
Options Exercised (in shares)     (104)  
Options Cancelled (in shares)     (440)  
Options outstanding at the end of the period (in shares) 3,142   3,142  
Vested or expected to vest (in shares)   3,073   3,073
Weighted-Average Exercise Price        
Balance at the beginning of the period (in dollars per share)     $ 32.43  
Options Granted (in dollars per share)     20.61  
Options Exercised (in dollars per share)     23.68  
Options Cancelled (in dollars per share)     30.74  
Balance at the end of the period (in dollars per share) $ 27.76   27.76  
Vested or expected to vest (in dollars per share)   $ 27.66   $ 27.66
Exercisable (in dollars per share) $ 31.75   $ 31.75  
Weighted-Average Remaining Contractual Term        
Outstanding     3 years 10 months 21 days  
Vested or expected to vest       3 years 10 months 13 days
Exercisable     2 years 11 months 16 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value   $ 597   $ 597
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 1,287   1,287  
Aggregate Intrinsic Value        
Outstanding $ 597   $ 597  
Vested or expected to vest 24   24  
Additional disclosures related to stock options        
Total intrinsic value for stock options exercised $ 11 $ 1,780 $ 1,007 $ 3,639