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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts Payable and Accrued Expenses [Abstract]    
Accounts payable $ 12,337 $ 9,601
Accrued salaries, performance bonuses, other compensation and benefits 3,164 3,761
Accrued withholding tax for share-based compensation 1,701 0
Real estate and personal property taxes 338 340
Other 258 301
Total accounts payable and accrued expenses $ 17,798 $ 14,003