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Capital Structure - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Number of Options    
Options outstanding at the beginning of the period (in shares) 6,641  
Options Granted (in shares) 19  
Options Exercised (in shares) 0  
Options Cancelled (in shares) (160)  
Options outstanding at the end of the period (in shares) 6,500  
Vested and exercisable (in shares) 2,635  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 3.80  
Options Granted (in dollars per share) 1.02  
Options Exercised (in dollars per share) 0  
Options Cancelled (in dollars per share) 8.04  
Balance at the end of the period (in dollars per share) 3.69  
Vested and exercisable (in dollars per share) $ 6.67  
Weighted-Average Remaining Contractual Term (Years)    
Outstanding 5 years 25 days  
Vested and exercisable 3 years 8 months 15 days  
Aggregate Intrinsic Value    
Outstanding $ 1,000  
Vested and exercisable 0  
Additional disclosures related to stock options    
Total intrinsic value for stock options exercisable 0 $ 0
Total intrinsic value for stock options exercised $ 0 $ 0