Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Summary of stock-based compensation expense
Total stock based compensation expense	$ 179	$ 762	$ 1,594	$ 2,101
Remaining unamortized expense of stock-based compensation	965		965
Product Research and Development [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	73	69	433	187
Sales and Marketing [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	51	364	302	749
General and Administrative [Member]
Summary of stock-based compensation expense
Total stock based compensation expense	$ 55	$ 329	$ 859	$ 1,165