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Debt - Narrative Annual (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Feb. 28, 2019
USD ($)
Nov. 30, 2016
USD ($)
Sep. 30, 2020
USD ($)
Jun. 24, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]                    
Total debt facilities             $ 177,690 $ 187,690   $ 0
Convertible notes                    
Debt Instrument [Line Items]                    
Interest rate 7.00%   7.00%              
Debt instrument, face amount $ 150,000   $ 150,000              
Maturity date Nov. 30, 2026   Nov. 30, 2026              
Debt instrument, interest rate, delayed election impact             9.00%      
Total debt facilities             $ 150,000 150,000   $ 0
Redemption price, percentage of principal amount redeemed             100.00%      
Debt redemption threshold             $ 5,000      
Premium percentage             5.00%      
Anniversary redemption offering amount             $ 30,000      
Debt conversion converted instrument intrinsic value $ 32,700   $ 32,700              
Debt related commitment fee amount $ 3,500 $ 200 $ 3,500              
Original issue discount rate 5.00%   5.00%              
Debt instrument, discount $ 5,800   $ 5,800              
Commitment fee, percentage 3.00%   3.00%              
Debt issuance costs $ 900   $ 900              
Interest expense       $ 3,500 $ 6,900 $ 10,500 $ 14,100 $ 13,800 $ 13,400  
Convertible notes | Prior to November 30, 2021                    
Debt Instrument [Line Items]                    
Debt instrument, conversion ratio 0.0007073 0.0008679094                
Percentage of outstanding equity 10.61% 12.71% 10.61%              
Convertible notes | After November 30, 2021                    
Debt Instrument [Line Items]                    
Debt instrument, conversion ratio 0.00082806 0.0010203869                
Percentage of outstanding equity 12.20% 14.62% 12.20%              
Convertible notes | Effective Interest Rate                    
Debt Instrument [Line Items]                    
Interest rate during the period       11.95% 11.95% 11.95% 11.95% 11.95% 11.92%