Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Accrued Liabilities
Employee related expenses	$ 1,237	$ 1,237
Accrued real estate taxes	238	440
Accrued excise, franchise and sales taxes	235	83
Accrued operating expenses and other	1,670	384
Accrued liabilities	$ 3,380	$ 2,144