Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Summary of stock-based compensation expense
Total stock based compensation expense	$ 174	$ 343	$ 772	$ 1,415
Remaining unrecognized expense of stock-based compensation	1,038		1,038
Product Research and Development [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	99	92	322	360
Sales and Marketing [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	66	76	172	251
General and Administrative [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	$ 9	$ 175	$ 278	$ 804