Warrants (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Warrant	Mar. 31, 2014 Warrant	Nov. 30, 2012 Warrant Estimated fair value Short term convertible notes issued September and November 2012	Sep. 30, 2012 Warrant Estimated fair value Short term convertible notes issued September 2012	Nov. 30, 2012 Warrant Estimated fair value Short term convertible notes issued November 2012	Jul. 02, 2013 Series A preferred stock warrant	Nov. 30, 2012 Series A preferred stock warrant Estimated fair value Short term convertible notes issued September and November 2012	Jun. 30, 2014 Common stock	Jul. 02, 2013 Common stock Warrant
Warrants
Warrants exercisable into stock (in shares)										1,940,000		8,230	277,690
Exercise price (in dollars per share)					$ 7.23					$ 1.00		$ 15.19
Fair value of warrants												$ 100,000
Estimated fair value							300,000	100,000	200,000		300,000
Share price of common stock (in dollars per share)													$ 6.99
Number of shares of common stock to be purchased against outstanding warrants					285,920	277,690
Loss related to the change in the fair value of the warrant liability	$ 0	$ 2,545,000	$ 0	$ 2,587,000