Organization and Description of the Business (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Liquidity
Accumulated deficit		$ (72,336)	$ (61,503)
Stock Issued During Period, Shares, New Issues	5,758,000
Aggregate net proceeds from initial public offering	$ 41,200	$ 41,202