Share-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
Non-cash, share-based compensation expense
Total expenses	$ 161	$ 49	$ 491	$ 125
Research and Development
Non-cash, share-based compensation expense
Total expenses	40	7	122	36
General and Administrative
Non-cash, share-based compensation expense
Total expenses	$ 121	$ 42	$ 369	$ 89