Stockholders' Equity and Employee Stock Option Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 237	$ 114	$ 1,146	$ 290
Cost of Revenues [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	44	13	118	(4)
Product development [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	117	3	360	43
Sales and marketing [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	(106)	49	23	(29)
General and administrative [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 182	$ 49	$ 645	$ 280