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Newly Issued Accounting Standards (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity $ 78,244 $ 162,266 $ (29,199) $ 2,780
Additional paid-in capital        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity 549,349 566,916 434,391 433,756
Accumulated deficit        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity (447,756) (384,187) $ (391,215) $ (357,989)
Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity   (12,939)    
Long-term debt   12,939    
Cumulative Effect, Period of Adoption, Adjustment | Additional paid-in capital        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity   (26,699)    
Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total shareholders’ (deficit) equity   13,760    
Senior Notes        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Long-term debt $ 142,397 $ 128,210    
4.50 Percent Exchangeable Senior Notes Due 2023 | Senior Notes        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Interest rate   4.50%