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Stockholders' Equity - Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Number of Options    
Options outstanding at the beginning of the period (in shares) 4,423  
Options Granted (in shares) 1,903  
Options Exercised (in shares) 0  
Options Cancelled (in shares) (950)  
Options outstanding at the end of the period (in shares) 5,376  
Vested and exercisable (in shares) 1,778  
Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 9.60  
Options Granted (in dollars per share) 3.08  
Options Exercised (in dollars per share) 0  
Options Cancelled (in dollars per share) 11.29  
Balance at the end of the period (in dollars per share) 6.99  
Vested and exercisable (in dollars per share) $ 12.84  
Weighted-Average Remaining Contractual Term (Years)    
Outstanding 5 years 5 months 8 days  
Vested and exercisable 3 years 8 months 15 days  
Aggregate Intrinsic Value    
Outstanding $ 1,053,000  
Vested and exercisable 1,000  
Additional disclosures related to stock options    
Total intrinsic value for stock options exercisable 600 $ 0
Total intrinsic value for stock options exercised $ 0 $ 0