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Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($)
$ in Thousands
Total
ATM
Common Stock
Common Stock
ATM
Additional Paid-in Capital
Additional Paid-in Capital
ATM
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Balance at Dec. 31, 2019 $ 41,848   $ 1   $ 82,938   $ 21 $ (41,112)
Balance, Shares at Dec. 31, 2019     17,425,654          
Issuance of common stock 252 $ 825     252 $ 825    
Issuance of common stock, Shares     83,662 174,649        
Vesting of restricted stock liability 18       18      
Stock-based compensation expense 787       787      
Other comprehensive income (loss) 453           453  
Net loss (7,837)             (7,837)
Balance at Mar. 31, 2020 36,346   $ 1   84,820   474 (48,949)
Balance, Shares at Mar. 31, 2020     17,683,965          
Balance at Dec. 31, 2019 41,848   $ 1   82,938   21 (41,112)
Balance, Shares at Dec. 31, 2019     17,425,654          
Other comprehensive income (loss) 76              
Net loss (14,298)              
Balance at Jun. 30, 2020 30,972   $ 1   86,284   97 (55,410)
Balance, Shares at Jun. 30, 2020     17,723,850          
Balance at Mar. 31, 2020 36,346   $ 1   84,820   474 (48,949)
Balance, Shares at Mar. 31, 2020     17,683,965          
Issuance of common stock pursuant to employee stock purchase plan 96       96      
Issuance of common stock pursuant to employee stock purchase plan, Shares     39,885          
Vesting of restricted stock liability 18       18      
Stock-based compensation expense 1,350       1,350      
Other comprehensive income (loss) (377)           (377)  
Net loss (6,461)             (6,461)
Balance at Jun. 30, 2020 30,972   $ 1   86,284   97 (55,410)
Balance, Shares at Jun. 30, 2020     17,723,850          
Balance at Dec. 31, 2020 69,854   $ 2   141,074   (297) (70,925)
Balance, Shares at Dec. 31, 2020     24,753,102          
Issuance of common stock under registered direct offering, net of offering costs 29,909       29,909      
Issuance of common stock under registered direct offering, net of offering costs, Shares     4,285,710          
Exercise of stock options 4       4      
Exercise of stock options, Shares     1,458          
Vesting of restricted stock liability 18       18      
Stock-based compensation expense 1,044       1,044      
Other comprehensive income (loss) 42           42  
Net loss (8,991)             (8,991)
Balance at Mar. 31, 2021 91,880   $ 2   172,049   (255) (79,916)
Balance, Shares at Mar. 31, 2021     29,040,270          
Balance at Dec. 31, 2020 69,854   $ 2   141,074   (297) (70,925)
Balance, Shares at Dec. 31, 2020     24,753,102          
Other comprehensive income (loss) 88              
Net loss (18,149)              
Balance at Jun. 30, 2021 84,773   $ 2   174,054   (209) (89,074)
Balance, Shares at Jun. 30, 2021     29,382,806          
Balance at Mar. 31, 2021 91,880   $ 2   172,049   (255) (79,916)
Balance, Shares at Mar. 31, 2021     29,040,270          
Issuance of common stock pursuant to employee stock purchase plan 127       127      
Issuance of common stock pursuant to employee stock purchase plan, Shares     48,966          
Exercise of stock options 796       796      
Exercise of stock options, Shares     293,570          
Vesting of restricted stock liability 18       18      
Stock-based compensation expense 1,064       1,064      
Other comprehensive income (loss) 46           46  
Net loss (9,158)             (9,158)
Balance at Jun. 30, 2021 $ 84,773   $ 2   $ 174,054   $ (209) $ (89,074)
Balance, Shares at Jun. 30, 2021     29,382,806