Collaboration - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013	Jul. 26, 2013
Collaboration Agreements [Line Items]
Common stock shares issued	27,520,527	26,229,909	27,520,527
Intrexon Corporation [Member]
Collaboration Agreements [Line Items]
Expenses for work performed	$ 1,400,000		$ 2,400,000
Obligations for payments of quarterly cash royalties			On all other developed products, the Company will pay Intrexon quarterly cash royalties of 7% on aggregate annualized net sales up to $100 million, and 14% on aggregate annualized net sales greater than $100 million.
Common stock shares issued	1,317,520		1,317,520	1,243,781
Non-cash expense		$ 6,900,000
Common stock value per share	$ 5.25		$ 5.25	$ 6.03
Intrexon Corporation [Member] | Net Sales Upto Hundred Million [Member]
Collaboration Agreements [Line Items]
Royalty percentage			7.00%
Intrexon Corporation [Member] | Net Sales Greater Than Hundred Million [Member]
Collaboration Agreements [Line Items]
Royalty percentage			14.00%