Accrued Liabilities - Schedule of Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued Liabilities.
Accrued payroll and related employee costs	$ 4,282	$ 7,035
Accrued taxes	844	1,554
Accrued professional fees	1,001	1,382
Lease-related accruals	354	353
Other	1,553	2,944
Accrued liabilities	$ 8,034	$ 13,268