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Stockholders' Equity - Warrants to Purchase Common Stock (Details) - $ / shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity                
Outstanding and exercisable at the beginning 39 39 39 39 39 39 39 39
Exercised 0     0     0 0
Issued 0 0 0 0 0 0 0 0
Outstanding and exercisable at the end 39 39 39 39 39 39 39 39
Weighted-Average Outstanding, beginning $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80
Issued 0 0 0 0 0 0    
Weighted-Average Outstanding, end $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80 $ 6.80