Notes Payable (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Loan and security agreement, existing outstanding indebtedness	$ 20,000,000	$ 20,000,000
Accrued interest rate	9.25%	9.25%
Unamortized balance of debt discount	1,200,000
Unamortized balance of debt issuance costs	$ 142,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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