Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Deferred rent liability	$ 746	$ 906
Leasehold improvements financing and other (see a and b below)	128	193
Unrecognized tax benefits	244	2,400
Term Loan Credit Facility repayment fee (Note 10)	619	534
Other long-term liabilities	$ 1,737	$ 4,033