Prepaid Expenses And Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
OTHER CURRENT ASSETS
Prepaid sales and marketing expenses	$ 1,633	$ 1,538
Taxes receivable	2,016	1,222
Prepaid insurance	466	1,124
Other prepaid expenses and assets	2,284	3,294
Total	$ 6,399	$ 7,178