Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Aug. 31, 2012 sqft	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets [Line Items]
Total rent expense		$ 5.5	$ 4.3	$ 3.2
Aggregate space that the entity will occupy under the amended lease agreement	109,000
Lease term of additional space	7 years
Aggregate rent due over amended term of lease		35.0
Aggregate landlord reimbursable tenant improvements outstanding under the existing lease and the lease amendment		5.5
Additional period of renewal of amended lease with respect to entire leased space, option one	1 year
Additional period of renewal of amended lease with respect to entire leased space, option two	5 years
Maximum [Member]
Operating Leased Assets [Line Items]
Additional reimbursement for tenant improvements agreed by landlord per lease amendment		$ 8.2