Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Accrued payroll and related employee costs	$ 7,018	$ 4,519
Accrued property taxes	1,205	1,622
Accrued professional fees	654	947
Lease-related accruals	493	773
Other	1,395	1,519
Accrued liabilities	$ 10,765	$ 9,380