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Stock Option and Compensation Plans - Stock Incentive Plans and Stock Option Activity Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jan. 31, 2017
Apr. 30, 2016
Aug. 31, 2013
Jun. 30, 2017
Options outstanding, net of estimated forfeitures, vested or expected to vest        
Options outstanding (in shares)       3,537,000
Weighted average exercise price (in dollars per share)       $ 28.73
Weighted average remaining contractual life       7 years 8 months 22 days
Aggregate intrinsic value       $ 0.1
ESPP        
Stock Option and Compensation Plans        
Number of shares of common stock available for issuance under the Plan (in shares)       995,254
Purchase price of common stock as percentage of fair market value   85.00%    
Maximum | ESPP        
Stock Option and Compensation Plans        
Number of shares reserved for issuance under the Plan (in shares)   1,000,000    
2013 Plan        
Stock Option and Compensation Plans        
Number of shares of common stock available for issuance under the Plan (in shares)       1,927,000
Annual increase in shares reserved for issuance under the Plan (in shares)     2,542,372  
Annual increase in shares reserved for issuance under the Plan (as a percent) 4.00%   4.00%  
Increase in number of shares available under the Plan (in shares) 1,429,000     5,454,000
2013 Plan | Maximum        
Stock Option and Compensation Plans        
Number of shares reserved for issuance under the Plan (in shares)     3,359,641  
2007 Plan        
Stock Option and Compensation Plans        
Number of shares of common stock available for issuance under the Plan (in shares)     739,317