Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expenses And Other Current Assets
Prepaid expenses	$ 734	$ 153
Deferred offering costs (See note 9)	160
Total prepaid expenses and other current assets	$ 894	$ 153