Notes Payable - Additional Information (Detail) (Loan and Security Agreement [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Debt Instrument [Line Items]
Note issuance date	Jan. 17, 2012
Issuance of promissory note as part of merger transaction	$ 10,000,000
Maturity date	Jan. 01, 2016
Fixed interest rate	8.75%
Term A Loan [Member]
Debt Instrument [Line Items]
Issuance of promissory note as part of merger transaction	4,000,000
Term B Loan [Member]
Debt Instrument [Line Items]
Issuance of promissory note as part of merger transaction	$ 6,000,000