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
Mar. 31, 2019
Dec. 31, 2018
Accounts Payable and Accrued Liabilities    
Accounts payable $ 7,401 $ 4,517
Accrued expenses 2,453 2,004
Accrued compensation 5,253 6,477
Accounts Payable and Accrued Expenses $ 15,107 $ 12,998