Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Summary of accounts payable and accrued expenses
Accounts payable – trade	$ 1,774	$ 2,779
Accrued compensation and commissions	5,962	7,899
Accrued professional fees	1,038	1,622
Accrued step-up leases	284	213
Accrued income taxes	97
Other accrued expenses	3,578	4,039
Total accounts payable and accrued expenses	$ 12,733	$ 16,552