Subsequent Event - Additional Information (Detail) (Subsequent Event, USD $)	12 Months Ended
	Dec. 31, 2012
Subsequent Event
Subsequent Event [Line Items]
Debt instrument, interest rate, stated percentage	8.00%
Debt Instrument Payment Terms	The 8% Notes, including all outstanding principal and accrued and unpaid interest, are due and payable on the earlier of five years from date of issuance or upon the occurrence of an Event of Default (as defined in the 8% Notes). We may prepay the 8% Notes, in whole or in part, upon 60 calendar days prior written notice to the holders thereof. Interest accrues on the 8% Notes at a rate of 8.0% per annum, payable during the first three years that the 8% Notes are outstanding in shares of common stock, valued at the weighted average price of a share of common stock for the twenty consecutive trading days prior to the interest payment date, pursuant to the terms of the 8% Notes. During the fourth and fifth years that the 8% Notes are outstanding, interest that accrues under the 8% Notes shall be payable in cash.
Warrant Terms	The 8% Note Warrants are exercisable at an exercise price of $0.60 per share of common stock, subject to adjustment as provided for by the terms thereof, for a period commencing on the date of issuance and ending on the earlier to occur of the date that is (i) three years after the date upon which the weighted average price of a share of Common Stock for the 90 consecutive trading days prior to such date is at least $2.00 per share, and (ii) five years after the date on which the 8% Notes to which the applicable 8% Note Warrant is related has been repaid in full.
Debt issued, principal amount	$ 1,750,001
Demand promissory notes, interest rate per annum	8.00%
Convertible debt, conversion price	$ 0.40
Shares of stock called by warrants	4,375,004