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Fair Value Measurements - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Long-term debt $ 215,253,000   $ 215,253,000   $ 263,523,000
Total principal balance of long-term debt 235,940,000   235,940,000   321,448,000
Reclassification of embedded conversion feature to additional paid-in capital     36,952,000    
Unrealized gain on embedded debt conversion option 0 $ 0 (2,010,000) $ 0  
1.00% Paycheck Protection Program Term Note due April 28, 2022 | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Total principal balance of long-term debt 10,000,000   10,000,000   0
1.00% Paycheck Protection Program Term Note due April 28, 2022 | Level 2 | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 8,623,000   8,623,000    
Total principal balance of long-term debt 10,000,000   10,000,000    
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 7,020,000   7,020,000   0
France Term Loan | Level 2 | COVID-19          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 3,417,000   3,417,000    
Aggregate principal amount 7,020,000   7,020,000    
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 111,052,000   111,052,000    
Long-term debt 97,568,000   97,568,000    
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]          
Reclassification of embedded conversion feature to additional paid-in capital     (36,952,000)    
Tax impact of reclassification     0    
Unrealized gain on embedded debt conversion option     (2,010,000)    
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 3,457,000   3,457,000   136,085,000
Long-term debt 3,890,000   3,890,000   193,660,000
Line of Credit | Revolving B Credit Facility          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Fair value of debt 27,558,000   27,558,000   25,082,000
Long-term debt $ 28,216,000   $ 28,216,000   $ 25,788,000