Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The cash outflow to reacquire common stock during the period.

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Number of new stock issued during the period.

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Related Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Feb. 02, 2015	Mar. 27, 2015	Dec. 31, 2014
Related Party Transaction [Line Items]
Commitment to purchase common stock	$ 246,000	$ 132,000
Accrued expenses	8,220,000us-gaap_AccruedLiabilitiesCurrent				7,182,000us-gaap_AccruedLiabilitiesCurrent
Md Anderson Cancer Center \| Minimum
Related Party Transaction [Line Items]
Ownership percentage	5.00%
Intrexon Corporation
Related Party Transaction [Line Items]
Amounts paid for services incurred	3,000,000	1,700,000
Accrued expenses	3,000,000	500,000
Stock issued during period			1,440,000
Intrexon Corporation \| Before Amendment
Related Party Transaction [Line Items]
Commitment to purchase common stock				50,000,000
Intrexon Corporation \| After Amendment
Related Party Transaction [Line Items]
Commitment to purchase common stock				$ 43,500,000
Percentage of commitment for payments from receipts of upfronts, milestones and royalties				50.00%