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Details of Certain Balance Sheet Accounts (Schedule of Accrued Expenses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Details Of Certain Balance Sheet Accounts [Abstract]    
Current portion of operating lease liabilities $ 5,928  
Accrued health insurance 4,139 $ 3,926
Accrued professional fees 3,268 2,260
Accrued payroll taxes 1,681 769
Other 4,117 4,631
Accrued Liabilities, Current $ 19,133 $ 11,586