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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Summary of Significant Accounting Policies        
Net loss $ (5,389) $ (5,803) $ (8,916) $ (9,746)
Paid-in-kind dividend on Series C convertible preferred stock (2,000)   (4,196)  
Net loss attributable to common stockholders $ (7,389) $ (5,803) $ (13,112) $ (9,746)
Weighted average common shares outstanding - basic and diluted 45,757,532 38,281,087 44,786,403 37,914,818
Basic and diluted net loss per share $ (0.16) $ (0.15) $ (0.29) $ (0.26)