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Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Series A Convertible Preferred Stock
Series B Convertible Preferred Stock
Common stock
Additional Paid-in Capital
Accumulated Deficit
Total
Balance at Dec. 31, 2012 $ 38,724          
Balance (in shares) at Dec. 31, 2012 55,700,752          
Increase (decrease) in Convertible Preferred Stock            
Issuance of convertible preferred stock, net of issuance costs of $82 $ 9,174 $ 32,248        
Issuance of convertible preferred stock, net of issuance costs (in shares) 13,136,951 34,129,571        
Balance at Dec. 31, 2013 $ 47,898 $ 32,248        
Balance (in shares) at Dec. 31, 2013 68,837,703 34,129,571        
Balance at Dec. 31, 2012       $ 942 $ (35,378) $ (34,436)
Balance (in shares) at Dec. 31, 2012     374,381      
Increase (Decrease) in Stockholders' Equity (Deficit)            
Proceeds from exercises of common stock options       27   27
Proceeds from exercises of common stock options (in shares)     18,965      
Stock-based compensation expense       343   343
Net loss         (18,118) (18,118)
Balance at Dec. 31, 2013       1,312 (53,496) (52,184)
Balance (in shares) at Dec. 31, 2013     393,346      
Balance at Dec. 31, 2014 $ 47,898 $ 32,248        
Balance (in shares) at Dec. 31, 2014 68,837,703 34,129,571        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Proceeds from exercises of common stock options     $ 1 117   118
Proceeds from exercises of common stock options (in shares)     99,854      
Stock-based compensation expense       897   897
Net loss         (21,884) (21,884)
Balance at Dec. 31, 2014     $ 1 2,326 (75,380) (73,053)
Balance (in shares) at Dec. 31, 2014     493,200      
Increase (decrease) in Convertible Preferred Stock            
Issuance of convertible preferred stock, net of issuance costs of $82   $ 12,331        
Issuance of convertible preferred stock, net of issuance costs (in shares)   13,062,965        
Conversion of Convertible preferred stock to common stock $ (47,898) $ (44,579)       (92,477)
Conversion of Convertible preferred stock to common stock (in shares) (68,837,703) (47,192,536)        
Balance (in shares) at Dec. 31, 2015 0 0        
Increase (Decrease) in Stockholders' Equity (Deficit)            
Initial public offering, net of issuance costs of $7.3 million     $ 5 61,739   61,744
Initial public offering, net of issuance costs of $7.3 million (in shares)     5,750,000      
Proceeds from exercises of common stock options       91   $ 91
Proceeds from exercises of common stock options (in shares)     40,548     40,548
Stock-based compensation expense       1,658   $ 1,658
Conversion of convertible preferred stock into common stock     $ 9 92,468   92,477
Conversion of convertible preferred stock into common stock (in shares)     9,029,549      
Conversion of preferred stock warrants into warrants for the purchase of common stock       206   206
Net loss         (32,630) (32,630)
Balance at Dec. 31, 2015     $ 15 $ 158,488 $ (108,010) $ 50,493
Balance (in shares) at Dec. 31, 2015     15,313,297