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Loss per Share - Outstanding Options and Warrants (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,653 3,095 3,653 3,095
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 39 39 39 39