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Major Customers, Partnerships and Strategic Alliances - Agreement with Sigma-Aldrich Corporation - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2009	Jul. 31, 2007
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Common stock issued under license agreement	$ 93,796,000	$ 69,492,000
Research and development	56,744,000us-gaap_ResearchAndDevelopmentExpense	36,979,000us-gaap_ResearchAndDevelopmentExpense	31,709,000us-gaap_ResearchAndDevelopmentExpense
Sigma-Aldrich Corporation [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Research program to develop laboratory research reagents					3 years
Upfront license fee				20,000,000
Public offering, common stock shares issued				636,133
Reduced royalty rate				10.50%
Funding available under the amended agreement				25,000,000
Sigma-Aldrich Corporation [Member] \| Upfront license fee [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Upfront license fee				15,100,000
Common stock issued under license agreement				4,900,000
Sigma-Aldrich Corporation [Member] \| License agreement terms [Member]
Research and Development Arrangement, Contract to Perform for Others [Line Items]
Royalty revenues expected to be received				5,000,000
Research and development	$ 100,000	$ 200,000	$ 300,000