Quarterly report pursuant to Section 13 or 15(d)

Condensed Statement of Changes in Stockholders' Equity

v3.10.0.1
Condensed Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($)
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2017 $ 11,758,730 $ 225 $ 185,659,954 $ (173,901,449)
Beginning balance (in shares) at Dec. 31, 2017   22,584,588    
Stock-based compensation - restricted stock units ("RSUs") 8,136,686   8,136,686  
Stock-based compensation - employee stock purchase plan ("ESPP") 407,746   407,746  
Stock-based compensation - performance share units ("PSUs") 407,656   407,656  
Issuance of shares for RSUs   $ 4 (4)  
Issuance of shares for RSUs (in shares)   446,048    
Issuance of shares for PSUs   $ 1 (1)  
Issuance of shares for PSUs (in shares)   80,098    
Exercise of stock options 983,224 $ 2 983,222  
Exercise of stock options (in shares)   180,604    
Cashless exercise of warrants (in shares)   19,359    
Proceeds from contributions to the ESPP 370,814   370,814  
Proceeds from contributions to the ESPP (in shares)   29,458    
Issuance of shares in an at-the-market ("ATM") offering, net of issuance costs 38,846,815 $ 22 38,846,793  
Issuance of shares in an at-the-market ("ATM") offering, net of issuance costs (in shares)   2,221,455    
Net loss (25,741,828)     (25,741,828)
Ending balance at Jun. 30, 2018 $ 35,169,843 $ 254 $ 234,812,866 $ (199,643,277)
Ending balance (in shares) at Jun. 30, 2018   25,561,610