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Debt - Share Lending Agreement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Oct. 15, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Common stock, outstanding (in shares) 71,502,206   71,055,400
Affiliated Entity | Jeffries Capital Services LLC      
Debt Instrument [Line Items]      
Commons stock available to affiliate (in shares)   3,582,880  
Common stock, outstanding (in shares) 3,600,000    
Outstanding loaned shares $ 16,500    
Nominal fee per borrowed share $ 30    
Shares subject to become issued and outstanding in case of restructuring proceedings 3,600,000