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Convertible Preferred Stock Liability (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 29, 2016
shares
Jun. 10, 2015
Nov. 26, 2014
USD ($)
item
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Jan. 31, 2015
USD ($)
shares
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
Mar. 31, 2016
shares
Dec. 31, 2015
shares
Convertible preferred stock                    
Shares Authorized | shares                 0 14,274,741
Issuance of stock (in shares) | shares 4,700,000                  
Net proceeds             $ 3,995      
Change in fair value of convertible preferred stock liability             (300)      
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          
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              
Gain from change in estimated fair value             $ 300      
Change in fair value of convertible preferred stock liability           $ 17,900        
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%