Selected Quarterly Financial Data - Narrative (Details) (USD $)	3 Months Ended							12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Mar. 31, 2014	Mar. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Amount recovered from the submitted claim	$ 300,000	$ 400,000	$ 1,300,000	$ (300,000)	$ 100,000	$ 2,300,000		$ 1,900,000	$ 400,000
Offering expenses					500,000		700,000
Increase in Fair Value of Convertible Preferred Stock Warrant					$ 13,000