Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Trade accounts payable	$ 48,736	$ 24,526
Accrued compensation, benefits and payroll taxes	4,288	3,742
Accrued cost of revenue	5,576	3,671
Other payables and accrued expenses	819	1,059
Total accounts payable and accrued expenses	$ 59,419	$ 32,998