Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Convertible Notes Payable - Summary of Convertible Notes Payable (Detail) (USD $)	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2012 March 2012 convertible notes [Member]	Dec. 31, 2012 October 2012 convertible notes [Member]	Apr. 10, 2013 October 2012 subordinated convertible note [Member]	Dec. 31, 2012 October 2012 subordinated convertible note [Member]	Dec. 31, 2012 December 2012 convertible note [Member]
Debt Instrument [Line Items]
Convertible notes payable, current portion	$ 22,518,000		$ 20,204,000	$ 2,314,000
Convertible notes payable, noncurrent portion	19,342,000					2,797,000	16,545,000
Total convertible notes payable	$ 41,860,000	$ 8,804,000			$ 1,250,000