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Convertible Notes - Additional Information (Details)
1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
Day
$ / shares
Dec. 31, 2019
USD ($)
Dec. 07, 2020
USD ($)
Debt Instrument [Line Items]        
Embedded derivative liability       $ 4,600,000
Derivative liabilities fair value $ 18,400,000 $ 18,400,000    
Derivative liability related to debt discount       $ 9,700,000
Issuance costs 9,700,000 9,700,000    
Unamortized discount 9,600,000 9,600,000 $ 6,034,000  
Amortization of debt discount   3,656,000 $ 1,670,000  
Interest Expense        
Debt Instrument [Line Items]        
Amortization of debt discount   100,000    
7.25% Convertible Senior Notes due 2025        
Debt Instrument [Line Items]        
Principal amount $ 168,500,000 $ 168,500,000    
Debt instrument, annual interest rate 7.25% 7.25%    
Debt instrument, issuance date Dec. 07, 2020 Dec. 31, 2020    
Debt instrument, frequency of periodic payment semi-annually      
Debt instrument due date Dec. 01, 2025      
Debt instrument, initial payment date Jun. 01, 2021      
Debt instrument, convertible, initial conversion rate per $1,000 principal amount of convertible notes   278.0094    
Debt instrument convertible initial conversion price | $ / shares $ 3.60 $ 3.60    
Debt instrument, redemption period, start date   Dec. 01, 2023    
Debt instrument, convertible, threshold percentage of stock price trigger   130.00%    
Debt instrument, convertible, threshold trading days | Day   20    
Debt instrument, convertible, threshold consecutive trading days | Day   30    
Events of default, description   The Convertible Notes have customary provision relating to the occurrence of “Events of Default” (as defined in the Indenture), which include the following: (i) certain payment defaults on the Convertible Notes (which, in the case of a default in the payment of interest on the Convertible Notes, will be subject to a 30-day cure period); (ii) the Company’s failure to send certain notices under the Indenture within specified periods of time; (iii) the Company’s failure to comply with certain covenants in the Indenture relating to the Company’s ability to consolidate with or merge with or into, or sell, lease or otherwise transfer, in one transaction or a series of transactions, all or substantially all of the assets of the Company and its subsidiaries, taken as a whole, to another person; (iv) a default by the Company in its other obligations or agreements under the Indenture or the Convertible Notes if such default is not cured or waived within 60 days after notice is given in accordance with the Indenture; (v) certain defaults by the Company or any of its subsidiaries with respect to indebtedness for borrowed money of at least $7,500,000; (vi) the rendering of certain judgments against the Company or any of its subsidiaries for the payment of at least $7,500,000, where such judgments are not discharged or stayed within 60 days after the date on which the right to appeal has expired or on which all rights to appeal have been extinguished; and (vii) certain events of bankruptcy, insolvency and reorganization involving the Company or any of the Company’s significant subsidiaries.    
Debt instrument, effective interest rate 8.70% 8.70%    
7.25% Convertible Senior Notes due 2025 | Minimum        
Debt Instrument [Line Items]        
Debt instrument, debt default, amount $ 7,500,000 $ 7,500,000