Quarterly report pursuant to Section 13 or 15(d)

Accounts Payable and Accrued Expenses (Details)

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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts Payable and Accrued Liabilities    
Accounts payable $ 3,787 $ 4,517
Accrued expenses 3,247 2,004
Accrued compensation 7,936 6,477
Accounts Payable and Accrued Expenses $ 14,970 $ 12,998