XML 20 R6.htm IDEA: XBRL DOCUMENT v3.8.0.1
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
Accumulated Other Comprehensive Loss
Total
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 Convertible Preferred Stock              
Issuance of series B convertible preferred stock, net of issuance cost of $0.1 million   $ 12,331          
Issuance of series B convertible preferred stock, net of issuance cost of $0.1 million (in shares)   13,062,965          
Conversion of convertible preferred stock into common stock $ (47,898) $ (44,579)          
Conversion of convertible preferred stock into common stock (in shares) (68,837,703) (47,192,536)          
Balance at Dec. 31, 2014     $ 1 $ 2,326 $ (75,380)   $ (73,053)
Balance (in shares) at Dec. 31, 2014     493,200        
Increase (Decrease) in Stockholders' Equity (Deficit)              
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively     $ 5 61,739     61,744
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively (in shares)     5,750,000        
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 series B preferred stock warrants into warrants for the purchase of common stock       206     206
Proceeds from exercises of common stock options       91     91
Proceeds from exercises of common stock options (in shares)     40,548        
Stock-based compensation expense       1,658     1,658
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        
Increase (Decrease) in Stockholders' Equity (Deficit)              
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively     $ 3 11,991     11,994
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively (in shares)     3,243,015        
Proceeds from exercises of common stock options and warrants     $ 1 502     503
Proceeds from exercises of common stock options and warrants (in shares)     261,260        
Stock-based compensation expense       2,160     2,160
Unrealized losses on short-term investments           $ (4) (4)
Net loss         (36,060)   (36,060)
Balance at Dec. 31, 2016     $ 19 173,141 (144,070) (4) $ 29,086
Balance (in shares) at Dec. 31, 2016     18,817,572       18,817,572
Increase (Decrease) in Stockholders' Equity (Deficit)              
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively     $ 5 8,031     $ 8,036
Issuance of common stock from initial public offering/for registered direct and at-the-market offerings, net of issuance costs of $0.6 million, $1.1 million and $7.3 million for the years 2017, 2016 and 2015 respectively (in shares)     4,804,796        
Proceeds from exercises of common stock options       23     $ 23
Proceeds from exercises of common stock options (in shares)     22,879       22,879
Stock-based compensation expense       2,007     $ 2,007
Realized gain on short-term investments           $ 4 4
Net loss         (27,364)   (27,364)
Balance at Dec. 31, 2017     $ 24 $ 183,202 $ (171,434)   $ 11,792
Balance (in shares) at Dec. 31, 2017     23,645,247       23,645,247