Share-based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Share-Based Compensation [Line Items]
Shares available for grant	2,100,000
Granted during the period	$ 0.72	$ 1.26
Other general and administrative expense	$ 445,900	$ 1,853,400
Warrants issued in payment of interest	57,034	234,731
Fair value of bonus warrants at debt extinguishment	0	797,185
Risk-free interest rate	3.00%
Expected life	2 years 8 months 12 days
Expected volatility rate	50.00%
Change in fair value of derivative	13,300	492,100
Share based compensation arrangement by share based payment award options amortized expenses amount	71,800	316,100
Share-based compensation	673,617	3,046,202
Sharebased compensation arrangement by share based payment award options amortized expenses remaining amount	4,700
Weighted average fair value per share on grant date	$ 0.61	$ 0.93
Initial Hiring Compensation
Share-Based Compensation [Line Items]
Share based compensation arrangement by share-based payment award, options, grants in period, gross	250,000	1,130,000
Granted during the period	$ 0.72	$ 1.14
Share based compensation arrangement by share based payment award options amortized expenses amount	161,300	488,200
Addition To Initial Hiring Compensation
Share-Based Compensation [Line Items]
Share based compensation arrangement by share-based payment award, options, grants in period, gross		835,000
Granted during the period		$ 1.5
Share based compensation arrangement by share based payment award options amortized expenses amount	404,500	131,000
Director
Share-Based Compensation [Line Items]
Share based compensation arrangement by share-based payment award, options, grants in period, gross		400,000
Granted during the period		$ 1.2
Share-based compensation arrangements by share-based payment award, options, grants in period, grant date fair value	363,800
Share based compensation arrangement by share based payment award options amortized expenses amount	28,400	330,700
Advisory Board Members
Share-Based Compensation [Line Items]
Share based compensation arrangement by share-based payment award, options, grants in period, gross	50,000	232,500
Granted during the period	$ 0.74	$ 1.13
Share based compensation arrangement by share based payment award options amortized expenses amount	31,200	222,000
Convertible Debenture Bonus Warrants
Share-Based Compensation [Line Items]
Granted during the period, shares	166,675	316,682
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value	$ 0.6
Fair value of bonus warrants at debt extinguishment	57,000	234,700
Consultants Warrants
Share-Based Compensation [Line Items]
Granted during the period, shares	300,000	265,676
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value	$ 0.82	$ 1.25
Fair value of bonus warrants at debt extinguishment	78,600	265,100
Fair value assumptions, expected dividend rate	0.00%
Consultants Warrants \| Minimum
Share-Based Compensation [Line Items]
Risk-free interest rate	0.40%
Expected life	3 years
Expected volatility rate	100.00%
Consultants Warrants \| Maximum
Share-Based Compensation [Line Items]
Risk-free interest rate	0.60%
Expected life	5 years
Expected volatility rate	118.00%
Convertible Preferred Stock Warrants
Share-Based Compensation [Line Items]
Granted during the period, shares	3,761,365
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value	$ 1
Fair value of bonus warrants at debt extinguishment	2,400,000
Fair value assumptions, expected dividend rate	0.00%
Risk-free interest rate	0.60%
Expected life	51 months
Expected volatility rate	110.00%
Derivative liability at fair value	2,400,000
Derivative liability of warrants	1,800,000
Warrant
Share-Based Compensation [Line Items]
Granted during the period, shares	22,048,510
Fair value assumptions, expected dividend rate	0.00%
Risk-free interest rate	0.00%
Expected life	0 years
Expected volatility rate	0.00%
Change in fair value of derivative	157,800	273,400
Convertible Promissory Notes Warrants
Share-Based Compensation [Line Items]
Granted during the period, shares	17,820,470
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value	$ 0.6
Fair value of bonus warrants at debt extinguishment	0
Objective Based Options
Share-Based Compensation [Line Items]
Share based compensation arrangement by share based payment award options vested in period fair value	$ 22,300	$ 92,000

Derivative Liability Of Warrants.

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Fair Value Of Derivative Instrument

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Share Based Compensation Arrangement By Share Based Payment Award Options Amortized Expenses Amount.

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Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Grant Date Fair Value

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Increase in additional paid in capital due to warrants issued during the period. Includes also the proceeds of debt securities issued with detachable stock purchase warrants that are allocable to the warrants. These warrants qualify for equity classification and provide the holder with a right to purchase stock from the entity.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings.

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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Risk-free interest rate assumption used in valuing an instrument.

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The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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