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Condensed Consolidated Statements of Preferred Stock and Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
Common stock
Additional paid-in capital
Accumulated deficit
Redeemable Convertible Preferred Stock
Private Financing
Private Financing
Common stock
Private Financing
Additional paid-in capital
At-the-Market Offering
At-the-Market Offering
Common stock
At-the-Market Offering
Additional paid-in capital
Beginning balance (in shares) at Dec. 31, 2016         18,584,390.00            
Beginning balance at Dec. 31, 2016         $ 76,976            
Redeemable Convertible Preferred Stock                      
Accretion of redeemable convertible preferred stock to redemption value         $ 5            
Conversion of preferred stock to common stock (in shares)         (18,584,390.00)            
Conversion of preferred stock to common stock         $ (76,981)            
Ending balance (in shares) at Feb. 13, 2017         0            
Ending balance at Feb. 13, 2017         $ 0            
Beginning balance (in shares) at Dec. 31, 2016 833,744 833,744                  
Beginning balance at Dec. 31, 2016 $ (61,921) $ 8 $ 5,147 $ (67,076)              
Stockholders’ deficit                      
Conversion of preferred stock to common stock (in shares)         (18,584,390.00)            
Conversion of preferred stock to common stock         $ (76,981)            
Beginning balance (in shares) at Dec. 31, 2016         18,584,390.00            
Beginning balance at Dec. 31, 2016         $ 76,976            
Redeemable Convertible Preferred Stock                      
Accretion of redeemable convertible preferred stock to redemption value         $ 5            
Conversion of preferred stock to common stock (in shares)   13,066,666     (18,584,390)            
Conversion of preferred stock to common stock $ 76,981 $ 131 76,850   $ (76,981)            
Ending balance (in shares) at Sep. 30, 2017         0            
Ending balance at Sep. 30, 2017         $ 0            
Beginning balance (in shares) at Dec. 31, 2016 833,744 833,744                  
Beginning balance at Dec. 31, 2016 $ (61,921) $ 8 5,147 (67,076)              
Stockholders’ deficit                      
Issuance of common stock to investors, net of issuance cost (in shares)             6,359,628     297,653  
Issuance of common stock to investors, net of issuance cost           $ 39,156 $ 64 $ 39,092 $ 2,622 $ 3 $ 2,619
Accretion of preferred stock to current redemption value (5)     (5)              
Conversion of preferred stock to common stock (in shares)   13,066,666     (18,584,390)            
Conversion of preferred stock to common stock 76,981 $ 131 76,850   $ (76,981)            
Issuance of common stock upon reverse merger (in shares)   1,024,960                  
Issuance of common stock upon reverse merger 204 $ 10 194                
Reclassification of preferred stock warrant to common stock warrant 51   51                
Issuance of common stock upon exercise of warrant (in shares)   16,387                  
Exercises of stock options and issuance of restricted stock awards (in shares)   274,337                  
Exercises of stock options and issuance of restricted stock awards 220 $ 3 217                
Employee share purchases (in shares)   13,193                  
Shares issued for cash under employee share purchase plan 110   110                
Share-based compensation expense 1,693   1,693                
Net loss $ (20,126)     (20,126)              
Ending balance (in shares) at Sep. 30, 2017 21,886,568 21,886,568                  
Ending balance at Sep. 30, 2017 $ 38,985 $ 219 $ 125,973 $ (87,207)              
Ending balance (in shares) at Feb. 13, 2017         0            
Ending balance at Feb. 13, 2017         $ 0