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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term debt $ 219,411   $ 219,411   $ 263,523
Total principal balance of long-term debt 240,684   240,684   321,448
Unrealized gain on embedded debt conversion option (2,010) $ 0 (2,010) $ 0  
Reclassification of conversion option to equity, net of $0 tax effect (Note 8) 36,952   36,952    
Reclassification to equity of interest paid in kind attributable to conversion option, net of $635 tax effect 305 912 305 1,808  
Additional Paid-in Capital          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Reclassification of conversion option to equity, net of $0 tax effect (Note 8) 36,952   36,952    
Reclassification to equity of interest paid in kind attributable to conversion option, net of $635 tax effect 305 $ 912 305 $ 1,808  
Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Increase (Decrease) in Derivative Liabilities     38,962    
Unsecured Forgivable Loan | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total principal balance of long-term debt 10,000   10,000   0
Unsecured Forgivable Loan | Fair Value, Inputs, Level 2 [Member] | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 8,571   8,571    
Total principal balance of long-term debt 10,000   10,000    
France Term Loan | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total principal balance of long-term debt 6,721   6,721   0
France Term Loan | Fair Value, Inputs, Level 2 [Member] | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 3,271   3,271    
Aggregate principal amount 6,721   6,721    
Convertible Debt | 3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2024          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 109,640   109,640    
Long-term debt 96,364   96,364    
Convertible Debt | 3.00% / 5.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2024 | Level 3          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Derivative liability 0   0   0
Unrealized gain on embedded debt conversion option     (2,010)    
Reclassification of conversion option to equity, net of $0 tax effect (Note 8)     (36,952)    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax     0    
Convertible Debt | 5.00% / 7.00% Convertible Senior Secured PIK Toggle Notes Due August 31, 2022          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 3,350   3,350   136,085
Long-term debt 3,823   3,823   193,660
Line of Credit | Revolving B Credit Facility          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 26,707   26,707   25,082
Long-term debt $ 27,376   $ 27,376   $ 25,788