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Net Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:            
Net loss $ (12,367) $ (14,672) $ (2,334) $ (16,530) $ (27,039) $ (18,864)
Denominator:            
Weighted-average number of common shares outstanding - basic (in shares) 37,065,300   33,589,174   36,318,437 33,579,434
Loss per common share - basic (in dollars per share) $ (0.33)   $ (0.07)   $ (0.74) $ (0.56)
Loss per common share - diluted (in dollars per share) $ (0.33)   $ (0.07)   $ (0.74) $ (0.56)
Options on Common Shares Outstanding            
Denominator:            
Total potentially antidilutive derivatives excluded from losses per share (in shares)         4,431,267 3,167,192
Restricted Stock Units Unvested            
Denominator:            
Total potentially antidilutive derivatives excluded from losses per share (in shares)         7,757 14,233
Warrants on Common Shares Outstanding            
Denominator:            
Total potentially antidilutive derivatives excluded from losses per share (in shares)         1,571,429 1,571,429