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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)
$ in Thousands
Total
Public offering
2019 Stock purchase agreement
At-the-market
Common Stock
Common Stock
Public offering
Common Stock
2019 Stock purchase agreement
Common Stock
At-the-market
Additional Paid-in Capital
Additional Paid-in Capital
Public offering
Additional Paid-in Capital
2019 Stock purchase agreement
Additional Paid-in Capital
At-the-market
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018         30,839,463                  
Beginning balance at Dec. 31, 2018 $ 51,344       $ 308       $ 177,335       $ (3) $ (126,296)
Stockholders’ deficit                            
Issuance of common stock, net of issuance cost (in shares)         47,589                  
Issuance of common stock, net of issuance cost 134       $ 1       133          
Issuance of common stock for cash under employee stock purchase plan (in shares)         34,167                  
Issuance of common stock for cash under employee stock purchase plan 84               84          
Share-based compensation expense 1,018               1,018          
Change in unrealized gain on investments 5                       5  
Net loss (11,629)                         (11,629)
Ending balance (in shares) at Mar. 31, 2019         30,921,219                  
Ending balance at Mar. 31, 2019 $ 40,956       $ 309       178,570       2 (137,925)
Beginning balance (in shares) at Dec. 31, 2019 34,861,876       34,861,876                  
Beginning balance at Dec. 31, 2019 $ 15,754       $ 349       183,574       0 (168,169)
Stockholders’ deficit                            
Issuance of common stock, net of issuance cost (in shares)           15,000,000 2,200,000 975,063            
Issuance of common stock, net of issuance cost   $ 13,881 $ 4,049 $ 670   $ 150 $ 22 $ 10   $ 13,731 $ 4,027 $ 660    
Shares issued for cash upon the exercise of stock options (in shares)         17,238                  
Shares issued for cash upon the exercise of stock options 13               13          
Issuance of common stock for cash under employee stock purchase plan (in shares)         23,171                  
Issuance of common stock for cash under employee stock purchase plan 16               16          
Share-based compensation expense 664               664          
Change in unrealized gain on investments 0                          
Net loss $ (8,044)                         (8,044)
Ending balance (in shares) at Mar. 31, 2020 53,077,348       53,077,348                  
Ending balance at Mar. 31, 2020 $ 27,000       $ 531       $ 202,685       $ 0 $ (176,216)