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Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Jun. 30, 2015
$ / shares
shares
Mar. 13, 2015
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
shares
Mar. 31, 2016
$ / shares
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
$ / shares
shares
Preferred Stock, Number of Shares, Par Value and Other Disclosures            
Conversion of convertible preferred stock into common stock (in shares) 9,029,549          
Preferred Stock, Shares Authorized       5,000,000   5,000,000
Preferred Stock, Par or Stated Value Per Share | $ / shares       $ 0.001   $ 0.001
Proceeds from issuance of preferred stock, net of issuance costs | $         $ 12,331  
Preferred Stock, Shares Issued       0   0
Minimum number of series used to issue preferred stock       1    
Initial public offering            
Preferred Stock, Number of Shares, Par Value and Other Disclosures            
Conversion of convertible preferred stock into common stock (in shares)     9,029,549      
Share price (in dollars per share) | $ / shares $ 12.00   $ 12.00      
Gross proceeds from public offering | $     $ 61,700      
Series B Convertible Preferred Stock            
Preferred Stock, Number of Shares, Par Value and Other Disclosures            
Preferred Stock, Shares Authorized   56,026,590        
Share price (in dollars per share) | $ / shares   $ 0.9503        
Proceeds from issuance of preferred stock, net of issuance costs | $   $ 12,300        
Preferred Stock, Shares Issued   13,062,965