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Stock-based Awards - Narrative (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 01, 2017
shares
Nov. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
May 31, 2014
shares
Dec. 31, 2015
former_executive
$ / shares
shares
Mar. 31, 2015
shares
Dec. 31, 2016
USD ($)
equity_incentive_plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Stock-based Awards                  
Number of equity incentive plans | equity_incentive_plan             4    
Shares canceled and available for future issuance             3,254,115    
Total stock-based compensation expense | $             $ 24,739 $ 42,563 $ 29,333
Outstanding stock options (in shares)             24,541,512    
Number of non-vested RSUs (in shares)             4,339,320    
Former CEO                  
Stock-based Awards                  
Shares canceled and available for future issuance   1,333,332              
Total stock-based compensation expense | $               7,700  
Weighted average exercise price (in dollars per share) | $ / shares   $ 45.00              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares   1,401,553              
Payments for surrender and cancellation of options | $   $ 100              
Former Executive                  
Stock-based Awards                  
Total stock-based compensation expense | $               $ 3,000  
Number of former executives | former_executive         4        
Former President                  
Stock-based Awards                  
Shares canceled and available for future issuance     309,722   309,722     309,722  
Total stock-based compensation expense | $               $ 2,100  
Weighted average exercise price (in dollars per share) | $ / shares     $ 13.17            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares     252,431   252,431     252,431  
Common Stock                  
Stock-based Awards                  
Closing price of common stock (in dollars per share) | $ / shares             $ 12.50    
Options to Purchase Common Stock                  
Stock-based Awards                  
Shares of common stock, grants to purchase             4,812,332    
Total remaining stock-based compensation expense for unvested option awards | $             $ 33,100    
Weighted-average period             2 years 11 months 19 days    
Weighted-average grant-date fair value per share of options granted (in dollars per share) | $ / shares             $ 4.50 $ 4.76 $ 6.32
Total stock-based compensation expense | $             $ 14,800 $ 34,000 $ 27,200
Total intrinsic value of options exercised | $             $ 8,500 $ 19,200 $ 57,100
Weighted average exercise price (in dollars per share) | $ / shares             $ 9.56    
Outstanding stock options (in shares)     24,277,901   24,277,901   24,541,512 24,277,901  
Weighted average exercise price (in dollars per share) | $ / shares     $ 8.12   $ 8.12   $ 8.29 $ 8.12  
Options to Purchase Common Stock | Stock Options Performance 2                  
Stock-based Awards                  
Shares of common stock, grants to purchase                 2,776,114
Vesting period               48 months  
Weighted average exercise price (in dollars per share) | $ / shares                 $ 12.81
Outstanding stock options (in shares)                 2,241,796
Weighted average exercise price (in dollars per share) | $ / shares                 $ 12.81
Shares forfeited           288,406      
Options to Purchase Common Stock | Stock Options Performance                  
Stock-based Awards                  
Grant date fair values of awards | $                 $ 20,100
Restricted Stock Units (RSUs)                  
Stock-based Awards                  
Total remaining stock-based compensation expense for unvested option awards | $             $ 30,700    
Weighted-average period             2 years 11 months 27 days    
Total stock-based compensation expense | $             $ 9,900 $ 8,600 2,000
Fair value of shares of restricted stock awards vested | $             $ 11,800 $ 6,500 $ 300
Weighted average grant date fair value (in dollars per share) | $ / shares             $ 7.37 $ 8.17 $ 12.35
Shares granted             2,711,392    
Number of non-vested RSUs (in shares)     3,747,340   3,747,340   4,339,320 3,747,340  
Weighted average grant date fair value (in dollars per share) | $ / shares     $ 8.18   $ 8.18   $ 7.85 $ 8.18  
Restricted Stock Units (RSUs) | Former CEO                  
Stock-based Awards                  
Number of non-vested RSUs (in shares)   154,088              
Restricted Stock Units (RSUs) | Former Executive                  
Stock-based Awards                  
Shares of common stock, accelerated vesting of stock         48,113        
Restricted Stock Units (RSUs) | Former President                  
Stock-based Awards                  
Number of non-vested RSUs (in shares)     57,679   57,679     57,679  
Stock Option | Former Executive                  
Stock-based Awards                  
Shares of common stock, accelerated vesting of stock         337,111        
Restricted Stock Units Containing Two Step Vesting Condition                  
Stock-based Awards                  
Shares forfeited           73,939      
Weighted average grant date fair value (in dollars per share) | $ / shares                 $ 10.04
Shares granted                 720,146
Number of non-vested RSUs (in shares)                 583,537
Weighted average grant date fair value (in dollars per share) | $ / shares                 $ 10.07
2014 Plan                  
Stock-based Awards                  
Annual increase in the number of shares available for future issuance under the terms of the plan agreement       10,000,000          
Annual increase in the number of shares available for future issuance expressed as a percentage of the total outstanding shares of common stock as of the last day of the previous fiscal year       5.00%          
2014 Plan | Options to Purchase Common Stock                  
Stock-based Awards                  
Vesting period       4 years          
Expiration period       10 years          
2014 Plan | Restricted Stock Units (RSUs) | Minimum                  
Stock-based Awards                  
Vesting period       4 years          
2014 Plan | Restricted Stock Units (RSUs) | Maximum                  
Stock-based Awards                  
Vesting period       5 years          
2014 Plan | Subsequent event                  
Stock-based Awards                  
Additional shares registered (in shares) 4,307,976                
Inducement Plan                  
Stock-based Awards                  
Shares canceled and available for future issuance     0   0     0  
Shares of common reserved for issuance under non-qualified stock options             1,840,000    
Shares of common stock, grants to purchase               1,840,000  
Vesting period               4 years  
Expiration period               10 years