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Stock Option and Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2018
Apr. 30, 2016
Aug. 31, 2013
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Stock Option and Compensation Plans                
Options outstanding (in shares)       4,519,000   4,519,000    
Weighted-average exercise price of options (in dollars per share)       $ 17.56   $ 17.56    
Weighted-average remaining contractual life of options           7 years 9 months 18 days    
Aggregate intrinsic value of options outstanding       $ 100   $ 100    
Share-based compensation expense       $ 2,662 $ 4,988 $ 5,744 $ 11,052  
ESPP                
Stock Option and Compensation Plans                
Number of shares of common stock available for issuance under the Plan (in shares)       971,413   971,413    
Purchase price of common stock as percentage of fair market value   85.00%            
Expected weighted average period to recognize share-based compensation costs           2 months    
Common stock issued (in shares)           12,229 4,746  
Proceeds from stock plans           $ 27    
Restricted stock units                
Stock Option and Compensation Plans                
Share-based compensation expense       $ 0 0 $ 100 $ 100  
RSUs expected to vest (in shares)       110,000   110,000    
Weighted-average fair value of RSUs expected to vest (in dollars per share)       $ 50.80   $ 50.80    
Aggregate intrinsic value of RSUs expected to vest       $ 300   $ 300    
Total fair value vested           1,100    
Employees | Stock options                
Stock Option and Compensation Plans                
Share-based compensation expense       1,800 3,600 3,900 8,000  
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures       11,000   $ 11,000    
Expected weighted average period to recognize share-based compensation costs           2 years 2 months 12 days    
Employees | Restricted stock units                
Stock Option and Compensation Plans                
Share-based compensation expense       800 1,300 $ 1,700 2,600  
Expected weighted average period to recognize share-based compensation costs           1 year 7 months 6 days    
Unrecognized compensation costs, net of estimated forfeitures       3,900   $ 3,900    
Consultants | Non-employee Options                
Stock Option and Compensation Plans                
Share-based compensation expense         $ 100 100 $ 200  
Unrecognized share-based compensation costs for option awards, net of estimated forfeitures       100   $ 100    
Expected weighted average period to recognize share-based compensation costs           1 year 7 months 6 days    
Consultants | Restricted stock units                
Stock Option and Compensation Plans                
Expected weighted average period to recognize share-based compensation costs           1 year 4 months    
Unrecognized compensation costs, net of estimated forfeitures       $ 100   $ 100    
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)       2,419,000   2,419,000    
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) 1,444,000             6,898,000
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