Collaborations - Additional Information (Detail) (Abbott Molecular [Member], USD $)	1 Months Ended
	Jun. 30, 2014	May 31, 2014	Apr. 30, 2014
Abbott Molecular [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Paid or expects to pay for external development expenses	$ 1,300,000	$ 6,700,000
Expected agreement term		5 years
Maximum amount that may be credited towards any amount due from collaborator for third party license income received by the Company			$ 60,000,000
Percentage of third party license income received by the Company that is credited towards any amount due from collaborator			15.00%