Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Prepaid Expenses and Other Current Assets [Abstract]
Inventory	$ 2,158	$ 0
Income tax receivable	380	446
Prepaid expenses	583	422
Other current assets	903	1,184
Total prepaid expenses and other current assets	$ 4,024	$ 2,052