Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Summary of stock-based compensation expense
Total stock-based compensation expense	$ 20	$ 114
Remaining unrecognized expense of stock-based compensation	64
Research and development [Member]
Summary of stock-based compensation expense
Total stock-based compensation expense		43
Sales and marketing [Member]
Summary of stock-based compensation expense
Total stock-based compensation expense	14	62
General and administrative [Member]
Summary of stock-based compensation expense
Total stock-based compensation expense	$ 6	$ 9