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Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - 3 months ended Mar. 31, 2016 - USD ($)
$ in Thousands
Total
Convertible Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2015 $ (108,102) $ 112,292 $ 1 $ 12,115 $ (120,218)
Beginning balance, shares at Dec. 31, 2015 571,137 104,854,769 571,137    
Exercise of stock options $ 41     41  
Exercise of stock options, shares     17,344    
Stock-based compensation expense 308     308  
Issuance of common stock upon completion of initial public offering, net of offering costs 42,887   $ 6 42,881  
Issuance of common stock upon completion of initial public offering, net of offering costs, shares     6,250,000    
Conversion of convertible preferred stock to common stock 112,292 $ (112,292) $ 10 112,282  
Conversion of convertible preferred stock to common stock, shares   (104,854,769) 9,699,600    
Issuance of common stock to settle accruing Series A dividends     $ 3 (3)  
Issuance of common stock to settle accruing Series A dividends, Shares     2,590,742    
Issuance of common stock for partial payment of accrued bonus 62     62  
Issuance of common stock for partial payment of accrued bonus, shares     10,218    
Conversion of preferred stock warrant to common stock warrant 28     28  
Net loss (7,991)       (7,991)
Ending balance at Mar. 31, 2016 $ 39,525   $ 20 $ 167,714 $ (128,209)
Ending balance, shares at Mar. 31, 2016 19,139,041   19,139,041