Prepaid Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid inventories	$ 1,493	$ 4,468
Prepaid insurance and other	2,640	3,808
Prepaid expenses	$ 4,133	$ 8,276