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Statements of Stockholders' Equity - USD ($)
$ in Thousands
Common Stock
At-the-market offering
Common Stock
Additional Paid-In Capital
At-the-market offering
Additional Paid-In Capital
Accumulated Other Comprehensive (Loss) Gain
Accumulated Deficit
At-the-market offering
Total
Balance, Beginning at Dec. 31, 2019       $ 297,846 $ (221) $ (217,661)   $ 79,964
Balance, Beginning (in shares) at Dec. 31, 2019   27,217,649            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock, net of issuance costs     $ 23,011 105,328     $ 23,011 105,328
Issuance of common stock, net of issuance costs (in shares) 1,565,840 8,050,000            
Issuance of common stock under equity incentive and employee stock purchase plans       2,486       2,486
Issuance of common stock under equity incentive and employee stock purchase plans (in shares)   481,384            
Stock-based compensation expense       5,932       5,932
Other comprehensive (loss) gain         133     133
Net loss           (47,264)   (47,264)
Balance, Ending at Sep. 30, 2020       434,603 (88) (264,925)   169,590
Balance, Ending (in shares) at Sep. 30, 2020   37,314,873            
Balance, Beginning at Dec. 31, 2019       297,846 (221) (217,661)   79,964
Balance, Beginning (in shares) at Dec. 31, 2019   27,217,649            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock, net of issuance costs (in shares)   4,761,904            
Balance, Ending at Dec. 31, 2020       563,389 28 (283,811)   $ 279,606
Balance, Ending (in shares) at Dec. 31, 2020   43,745,465           43,745,465
Balance, Beginning at Jun. 30, 2020       424,855 (208) (257,162)   $ 167,485
Balance, Beginning (in shares) at Jun. 30, 2020   36,802,139            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock, net of issuance costs     $ 6,368 (3)     $ 6,368 (3)
Issuance of common stock, net of issuance costs (in shares) 333,047              
Issuance of common stock under equity incentive and employee stock purchase plans       1,495       1,495
Issuance of common stock under equity incentive and employee stock purchase plans (in shares)   179,687            
Stock-based compensation expense       1,888       1,888
Other comprehensive (loss) gain         120     120
Net loss           (7,763)   (7,763)
Balance, Ending at Sep. 30, 2020       434,603 (88) (264,925)   169,590
Balance, Ending (in shares) at Sep. 30, 2020   37,314,873            
Balance, Beginning at Dec. 31, 2020       563,389 28 (283,811)   $ 279,606
Balance, Beginning (in shares) at Dec. 31, 2020   43,745,465           43,745,465
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock, net of issuance costs       123,804       $ 123,804
Issuance of common stock, net of issuance costs (in shares)   3,503,311            
Issuance of common stock under equity incentive and employee stock purchase plans       3,944       3,944
Issuance of common stock under equity incentive and employee stock purchase plans (in shares)   429,938            
Stock-based compensation expense       11,371       11,371
Other comprehensive (loss) gain         (232)     (232)
Shares withheld for net settlement of tax withholding upon vesting of restricted stock units       (189)       (189)
Shares withheld for net settlement of tax withholding upon vesting of restricted stock units (in shares)   (7,060)            
Net loss           (88,644)   (88,644)
Balance, Ending at Sep. 30, 2021       702,319 (204) (372,455)   $ 329,660
Balance, Ending (in shares) at Sep. 30, 2021   47,671,654           47,671,654
Balance, Beginning at Jun. 30, 2021       696,157 (59) (338,651)   $ 357,447
Balance, Beginning (in shares) at Jun. 30, 2021   47,525,560            
Increase (Decrease) in Stockholders' Equity                
Issuance of common stock, net of issuance costs       6       6
Issuance of common stock under equity incentive and employee stock purchase plans       1,381       1,381
Issuance of common stock under equity incentive and employee stock purchase plans (in shares)   146,094            
Stock-based compensation expense       4,775       4,775
Other comprehensive (loss) gain         (145)     (145)
Net loss           (33,804)   (33,804)
Balance, Ending at Sep. 30, 2021       $ 702,319 $ (204) $ (372,455)   $ 329,660
Balance, Ending (in shares) at Sep. 30, 2021   47,671,654           47,671,654