Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Minimum term of non-cancellable operating leases	1 year
Expiration of non-cancellable operating leases maximum year	2019
Financing for leasehold improvement		$ 1,100,000
Outstanding liability related to leasehold improvements	700,000
Leasehold Improvements reflected in Accrued liabilities	100,000
Leasehold Improvements reflected in Other non-current liabilities	600,000
Additional Concord Lease
Commitments and Contingencies Disclosure [Line Items]
Early termination of non-cancellable operating leases minimum period	2015-01
Initial term of operating lease	2 years
Number of renewal options	4
Renewal period of operating lease	2 years
Lease commencement date	Aug. 01, 2013
Future rent payment, 2013	51,456
Future rent payment, 2014	154,368
Future rent payment, 2015	$ 90,048