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- Schedule of Cash and Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]        
Cash and cash equivalents $ 79,016 $ 20,168    
Restricted cash included in other long-term assets 20,840 20,817    
Total cash, cash equivalents and restricted cash $ 99,856 $ 40,985 $ 46,872 $ 32,891