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Debt - Summary of Long Term Debt (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
day
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Debt Instrument [Line Items]      
Net carrying value   $ 390,434 $ 389,254
Debt conversion, converted instrument, shares issued (in shares) | shares 4,100    
Common stock, par value (in dollars per share) | $ / shares $ 0.01 $ 0.01 $ 0.01
Senior Loans | Senior Secured Term Loan due 2026      
Debt Instrument [Line Items]      
Principal   $ 400,000 $ 400,000
Less: debt discount   (6,794) (7,434)
Less: deferred financing   (5,111) (5,592)
Net carrying value   388,095 386,974
Convertible Notes | Convertible Senior Notes 2016, Due 2023      
Debt Instrument [Line Items]      
Principal   2,800 2,825
Less: debt discount   (438) (518)
Less: deferred financing   (23) (27)
Net carrying value   $ 2,339 $ 2,280
Threshold percentage   130.00%  
Threshold trading days   20 days  
Threshold consecutive trading days | day   30  
Debt conversion, converted instrument, amount $ 25