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Loss Per Share (Details)
$ in Thousands
12 Months Ended
Apr. 04, 2018
USD ($)
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive common stock instruments outstanding (shares)   9,283,000 8,571,000 10,147,000
September 2021 Securities Purchase Agreement | Affiliated Entity        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock issuable upon conversion of the Series A Preferred Stock (shares)   3,954,546    
Series A Preferred Stock        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Conversion ratio (shares)   1    
Sale or merger trigger conversion ratio (shares)   1    
Series A Preferred Stock | September 2021 Securities Purchase Agreement | Affiliated Entity        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Common stock issuable upon conversion of the Series A Preferred Stock (shares)   3,954,546    
Prepaid Forward        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Stock underlying the Prepaid Forward (shares)   1,858,500    
Maximum        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares issued (shares)     5,500,000 5,500,000
Convertible notes        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding principal | $     $ 171,500 $ 171,500
Convertible notes | 2.50% Convertible Notes due 2023        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Outstanding principal | $ $ 116,600 $ 120,500 $ 171,500  
Conversion ratio 0.0323428      
Shares issued (shares)   0    
Issuable upon conversion of the Notes (shares)   3,900,000    
Shares issuable upon the release of restricted stock awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive common stock instruments outstanding (shares)   2,090,000 526,000 14,000
Shares issuable upon exercise of stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive common stock instruments outstanding (shares)   7,193,000 8,045,000 10,133,000