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Other Current Assets and Other Long-Term Assets - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 8,892 $ 5,672
Deposits and other receivables 5,914 2,119
Interest receivable 1,535 1,566
Other current assets $ 16,341 $ 9,357