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Balance Sheet Account Detail - Prepaid Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deposits $ 10,549 $ 6,792
Prepaid insurance 290 782
Prepaid expenses and other assets $ 10,839 $ 7,574