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FAIR VALUE MEASUREMENTS - Fair Value Measurements of financial instruments not measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes carrying amount $ 98,941 $ 129,507
French loans carrying amount 17,981 21,835
Fair Value, Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
French loans, fair value disclosure 17,981 21,835
Convertible Note due 2022    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes carrying amount 36,824 35,925
Convertible Note due 2022 | Fair Value, Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible debt, fair value disclosures 78,619 54,204
Convertible Note due 2024    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Notes carrying amount 98,941 93,582
Convertible Note due 2024 | Fair Value, Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Convertible debt, fair value disclosures $ 173,419 $ 125,953