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Convertible Preferred Stock Liability (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 11 Months Ended 12 Months Ended
Jun. 10, 2015
Nov. 26, 2014
USD ($)
item
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jan. 31, 2015
USD ($)
shares
Mar. 31, 2015
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
shares
Dec. 31, 2016
shares
Convertible preferred stock                    
Shares Authorized | shares             8,921,438 14,274,741 8,921,438 0
Net proceeds             $ 12,611 $ 95,569    
Change in fair value of convertible preferred stock liability               $ 17,600    
Series A convertible preferred stock                    
Convertible preferred stock                    
Shares Authorized | shares   8,921,438           8,921,429    
Issuance of stock (in shares) | shares   3,395,468 4,460,715 1,065,246     3,395,468 5,525,961    
Net proceeds   $ 12,600 $ 16,700 $ 4,000            
Number of defined triggers for issuance of additional shares to first tranche investors on the same terms | item   3                
Convertible preferred stock liability   $ 2,600                
Change in fair value of convertible preferred stock liability           $ 17,600        
Reclassification of liability to convertible preferred stock     $ 20,200              
Series A convertible preferred stock | Obligation to issue second tranche                    
Convertible preferred stock                    
Fixed price for second tranche obligation (in dollars per share) | $ / shares     $ 3.755              
Assumed term 2 years       9 months       1 year  
Interest rate (as a percent) 0.75%       0.20%       0.13%  
Volatility (as a percent) 75.00%       85.00%       85.00%