Convertible Preferred Stock and Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		9 Months Ended
	Feb. 07, 2014	Sep. 30, 2015	Sep. 30, 2014
Warrants and Rights Note Disclosure [Abstract]
Stock warrants exercised, shares	1,277,250
Warrants exercised, price per share (in dollars per share)	$ 1.21
Proceeds from exercise of stock warrants	$ 1,500	$ 0	$ 1,545