Stockholders' Equity and Employee Stock Option Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 467	$ (1)
Cost of Revenues [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	29	11
Product development [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	124	(1)
Sales and marketing [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	102	(121)
General and administrative [Member]
Stock-based Compensation Expense
Stock-based Compensation Expense, Total	$ 212	$ 110