Commitments and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended	12 Months Ended
	Jun. 03, 2013 sqft	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Line Items]
Lease period	9 years
Lease building space	43,600
Monthly lease payments	$ 209
Rent abatement	209
Contribution from the landlord towards the initial build-out of the space	6,538
Option to extend this lease	5 years
Cash-collateralized irrevocable standby letter of credit	1,253
Lease expiration date	Mar. 31, 2015
Rent expenses including additional charges		2,405	815	638
Rent Commencement Date [Member]
Commitments And Contingencies Disclosure [Line Items]
Cash-collateralized irrevocable standby letter of credit	1,044
First Anniversary of the Rent Commencement Date [Member]
Commitments And Contingencies Disclosure [Line Items]
Cash-collateralized irrevocable standby letter of credit	835
Second Anniversary of the Rent Commencement Date [Member]
Commitments And Contingencies Disclosure [Line Items]
Cash-collateralized irrevocable standby letter of credit	$ 627