Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accrued Liabilities
Employee related expenses	$ 931	$ 1,237
Accrued real estate taxes	173	440
Accrued excise, franchise and sales taxes	207	83
Accrued other	1,240	384
Accrued liabilities	$ 2,551	$ 2,144