Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accrued Expenses and Other Liabilities
Employee related expenses	$ 8,059	$ 4,572
Contract liability	4,063	1,350
Accrued payables due to customers		1,200
Client funds obligations	4,316
Contract labor	2,469	463
Interest	111	13
Deferred rent	126	163
Professional fees	817	288
Income taxes payable	167	20
Other expenses	1,817	919
Total accrued expenses and other liabilities	$ 21,945	$ 8,988