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Balance Sheet Account Detail - Prepaid Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Vendor deposits $ 9,285 $ 8,740
Prepaid insurance 978 1,408
Prepaid expenses and other assets $ 10,263 $ 10,148