Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Accrued payroll and related employee costs	$ 5,646	$ 4,519
Accrued property taxes	968	1,622
Accrued professional fees	1,142	947
Lease-related accruals	602	773
Other	1,253	1,519
Accrued liabilities	$ 9,611	$ 9,380