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Stock Plans - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of Options      
Options outstanding at the beginning of the period (in shares) 2,306    
Options Granted (in shares) 2,891    
Options Exercised (in shares) (104)    
Options Cancelled (in shares) (1,143)    
Options outstanding at the end of the period (in shares) 3,950 2,306  
Exercisable (in shares) 1,185    
Weighted-Average Exercise Price      
Balance at the beginning of the period (in dollars per share) $ 32.43    
Options Granted (in dollars per share) 15.09    
Options Exercised (in dollars per share) 11.34    
Options Cancelled (in dollars per share) 12.93    
Balance at the end of the period (in dollars per share) 21.54 $ 32.43  
Exercisable (in dollars per share) $ 32.35    
Weighted-Average Remaining Contractual Term      
Outstanding 5 years 4 months 2 days    
Exercisable 3 years 3 months 4 days    
Aggregate Intrinsic Value      
Outstanding $ 0    
Exercisable 0    
Additional disclosures related to stock options      
Total intrinsic value for stock options exercised $ 1,007 $ 8,953 $ 18,369