Description of the Business and Liquidity (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Liquidity
Accumulated deficit		$ (84,611)	$ (72,336)
Stock Issued During Period, Shares, New Issues	5,758,000
Aggregate net proceeds from initial public offering	$ 41,200