Stock-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Granted, Shares	3,015,696	11,769,866
Unvested Options [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items]
Balance Beginning, Number of Shares	8,537,679	1,683,733
Unvested options assumed through merger with SafeStitch, Number of Shares	1,116,000
Granted, Shares	3,015,696	11,769,866
Vested, Number of Shares	(3,559,092)	(3,612,025)
Forfeited, Number of Shares	(27,452)	(1,303,895)
Balance Ending, Number of Shares	9,082,831	8,537,679
Balance Beginning	$ 0.08	$ 0.33
Granted, Weighted-Average FairValue	$ 0.19	$ 0.07
Vested, Weighted-Average FairValue	$ 0.25	$ 0.14
Forfeited, Weighted-Average FairValue	$ 0.04	$ 0.23
Balance Ending, Weighted-Average FairValue	$ 0.22	$ 0.08
Unvested options assumed through merger with SafeStitch, Weighted-Average FairValue	$ 0.49