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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Summary of Significant Accounting Policies        
Net loss $ (6,526) $ (11,418) $ (15,442) $ (21,164)
Paid-in-kind dividend on Series C convertible preferred stock (2,000)   (6,196)  
Net loss attributable to common stockholders $ (8,526) $ (11,418) $ (21,638) $ (21,164)
Weighted average common shares issued and outstanding - basic 46,137,147 39,144,916 45,220,319 38,211,327
Weighted average common shares issued and outstanding - diluted 46,137,147 39,144,916 45,220,319 38,211,327
Weighted average common shares outstanding - basic and diluted 46,137,147 39,144,916 45,220,319 38,211,327
Basic net loss per share $ (0.18) $ (0.29) $ (0.48) $ (0.55)
Diluted net loss per share (0.17) (0.29) (0.46) (0.55)
Basic and diluted net loss per share $ (0.18) $ (0.29) $ (0.48) $ (0.55)