Warrants - Summary of Warrant Activity (Detail) (Warrants Not Settleable in Cash [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Warrants Not Settleable in Cash [Member]
Class of Warrant or Right [Line Items]
Beginning balance	1,285,394	279,588
Weighted Average Fair Value, Granted	$ 1.41
Weighted Average Remaining Contractual Life, Warrants assumed in merger with SafeStitch		4 years 3 months 18 days
Number of Warrants, Granted	38,325
Number of Warrants, Warrants assumed in merger with SafeStitch		1,199,600
Number of Warrants, Exercised	(10,000)	(193,794)
Number of Warrants, Expired/cancelled		0
Ending balance	1,313,719	1,285,394	279,588
Weighted Average Exercise Price, Outstanding	$ 1.45	$ 1.45
Weighted Average Exercise Price, Granted	$ 4.02
Weighted Average Exercise Price, Warrants assumed in merger with SafeStitch		$ 1.65
Weighted Average Exercise Price, Exercised	$ 1.65	$ 1.45
Weighted Average Exercise Price, Outstanding	$ 1.70	$ 1.45	$ 1.45
Weighted Average Fair Value, Outstanding	$ 1.75	$ 0.45
Weighted Average Remaining Contractual Life, Granted	6 years 8 months 12 days
Weighted Average Fair Value, Warrants assumed in merger with SafeStitch		$ 1.15
Weighted Average Fair Value, Exercised		$ 5.25
Weighted Average Remaining Contractual Life, Outstanding	3 years 10 months 24 days	4 years 8 months 12 days	9 years 1 month 6 days
Weighted Average Fair Value, Outstanding	$ 1.75	$ 1.75	$ 0.45