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Share-Based Compensation - Warrants (Details) - Warrant - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Warrant Activity and Other Data, Outstanding [Roll Forward]      
Outstanding, beginning balance (in shares) 291,000    
Granted (in shares) 0 0 0
Exercised (in shares) 0    
Forfeited (in shares) 0    
Expired (in shares) (291,000)    
Outstanding, ending balance (in shares) 0 291,000  
Warrants exercisable (in shares) 0    
Warrant Activity and Other Data, Weighted Average Exercise Price [Abstract]      
Warrants outstanding, beginning balance (in usd per share) $ 13.59    
Granted (in usd per share) 0    
Exercised (in usd per share) 0    
Forfeited (in usd per share) 0    
Expired (in usd per share) 13.59    
Warrants outstanding, ending balance (in usd per share) 0 $ 13.59  
Warrants exercisable (in usd per share) $ 0    
Warrants outstanding, Weighted Average Remaining Contractual Life (in years) 0 years    
Warrants exercisable, Weighted Average Remaining Contractual Life (in years) 0 years    
Warrants outstanding, Aggregate Intrinsic Value $ 0    
Warrants exercisable, Aggregate Intrinsic Value $ 0