Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	6 Months Ended	12 Months Ended	1 Months Ended
	Feb. 01, 2013 Boston Children's Hospital and Children's Medical Center Corporation [Member]	Jun. 30, 2014 Boston Children's Hospital and Children's Medical Center Corporation [Member]	Dec. 31, 2013 Boston Children's Hospital and Children's Medical Center Corporation [Member]	Jan. 31, 2014 CMCC [Member]
Loss Contingencies [Line Items]
Amount claimed	$ 642,906
Amount of agreed settlement paid		185,000
Shares received against execution of sublicense granted		20,000
Value of common stock for settlement of claims			$ 40,000	$ 40,000