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 [Abstract]    
Accounts payable $ 6,582 $ 8,030
Accrued compensation 3,156 6,193
Other accrued expenses $ 6,521 $ 6,971