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Stock-Based Compensation and Stock Options - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Options outstanding, beginning (in shares) 750,000 1,050,000  
Options granted (in shares) 2,850,000 100,000  
Options exercised (in shares) (75,000) (300,000)  
Options forfeited and canceled (in shares) (200,000) (100,000)  
Options outstanding, ending (in shares) 3,325,000 750,000 1,050,000
Weighted-Average Exercise Price      
Options outstanding, weighted average exercise price, beginning (in dollars per share) $ 10.35 $ 9.50  
Options granted, weighted average exercise price (in dollars per share) 3.49 19.28  
Options exercised, weighted average exercise price (in dollars per share) 3.49 7.22  
Options forfeited and canceled, weighted average exercise price (in dollars per share) 17.48 19.74  
Options outstanding, weighted average exercise price, ending (in dollars per share) $ 3.49 $ 10.35 $ 9.50
Exercisable and fully vested (in shares) 2,250,000    
Exercisable and fully vested, weighted average exercise price (in dollars per share) $ 3.49    
Options outstanding weighted-average remaining contractual life 4 years 4 months 20 days 6 years 3 days 7 years 6 months 10 days
Options exercisable weighted-average remaining contractual life 4 years 6 months 21 days    
Vested and expected to vest, outstanding, aggregate intrinsic value $ 19,784    
Vested and expected to vest, exercisable, aggregate intrinsic value $ 13,388    
Outstanding and expected to vest thereafter (in shares) 1,075,000    
Outstanding and expected to vest thereafter, weighted average exercise price (in dollars per share) $ 3.49    
Outstanding and expected to vest, weighted average remaining contractual life 4 years 18 days    
Outstanding and expected to vest, aggregate intrinsic value $ 6,396