Prepaid Expenses and Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Prepaid Expenses and Other Assets
Prepaid insurance	$ 296	$ 302
Prepaid contractor fees and vendor advances		12
Deferred offering costs	153
Recoupable deposits and other	129	137
Prepaid expenses and other assets	$ 578	$ 451