Preferred Stock - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||||||||
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Dec. 31, 2012
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Dec. 31, 2013
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May 14, 2013
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Sep. 25, 2012
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Sep. 12, 2012
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Dec. 31, 2013
Series B
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Dec. 31, 2012
Series B Preferred Stock
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Dec. 31, 2013
Series B Preferred Stock
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Dec. 31, 2013
Series C Convertible Preferred Stock
D
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Dec. 31, 2012
Series C Convertible Preferred Stock
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Dec. 20, 2012
Series C Convertible Preferred Stock
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Dec. 31, 2013
Series C Convertible Preferred Stock
Period 3
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Dec. 31, 2013
Series C Convertible Preferred Stock
Period 4
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May 15, 2013
Series D Convertible Preferred Stock
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Mar. 31, 2013
Series D Convertible Preferred Stock
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Dec. 31, 2013
Series D Convertible Preferred Stock
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Dec. 31, 2012
Series D Convertible Preferred Stock
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Dec. 20, 2012
Series D Convertible Preferred Stock
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Feb. 21, 2013
Series E Convertible Preferred Stock
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Dec. 31, 2013
Series E Convertible Preferred Stock
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Dec. 31, 2013
Series E Convertible Preferred Stock
After Trigger Date
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Dec. 31, 2013
Series E Convertible Preferred Stock
Scenario 2
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Aug. 22, 2013
Series F Convertible Preferred Stock
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Dec. 31, 2013
Series F Convertible Preferred Stock
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Dec. 31, 2013
Series A Preferred Stock
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Dec. 31, 2012
Series A Preferred Stock
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Preferred Stock [Line Items] | ||||||||||||||||||||||||||
Preferred stock authorized to issue | 5,000,000 | 1,000,000 | 25,000 | 25,000 | 13,000 | 13,000 | 3,000 | |||||||||||||||||||
Preferred stock, issued | 600,000 | 10,000 | 10,000 | 11,000 | 0 | 0 | ||||||||||||||||||||
Preferred stock, outstanding | 10,000 | 10,000 | 11,000 | 0 | 0 | |||||||||||||||||||||
Preferred stock , Par value | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | |||||||||||||||||||||
Proceeds from issuance of convertible preferred stock | $ 6,000,000 | $ 5,195,000 | $ 10,000,000 | $ 5,000,000 | $ 5,000,000 | |||||||||||||||||||||
Conversion price per share | $ 0.13 | $ 0.6889 | $ 0.6959 | $ 1.17 | $ 4.5881 | |||||||||||||||||||||
Convertible Preferred Stock, Total Shares Issued Upon Conversion | 46,153,846 | |||||||||||||||||||||||||
Ownership Percentage | 73.00% | |||||||||||||||||||||||||
Convertible stock, Conversion of preferred stock | 599,998 | 11,915 | ||||||||||||||||||||||||
Convertible stock, Conversion of convertible securities | 46,153,692 | 1,712,167 | ||||||||||||||||||||||||
Liquidation preference per share | $ 10 | $ 1,000 | $ 100 | $ 1,000 | $ 1,000 | |||||||||||||||||||||
Common stock price in increased rate | $ 0.59 | |||||||||||||||||||||||||
Preferred stock issued due to investment agreement | 10,000 | 11,177 | 5,000 | 5,000 | ||||||||||||||||||||||
Preferred stock conversion as a percentage its stated value in an event of a change in control or a merger or recapitalization | 150.00% | 125.00% | ||||||||||||||||||||||||
Preferred stock conversion, trading price as percentage of conversion price | 200.00% | |||||||||||||||||||||||||
Preferred stock conversion, number of trading days | 20 days | |||||||||||||||||||||||||
Preferred stock conversion, number of immediate preceding consecutive trading days | 30 | |||||||||||||||||||||||||
Preferred stock, cumulative dividends rate | 10.00% | 5.00% | 7.00% | |||||||||||||||||||||||
Preferred stock, stated value for cumulative dividends | $ 1,000 | |||||||||||||||||||||||||
Preferred stock, dividends accrued | 1,014,000 | |||||||||||||||||||||||||
Merger agreement, number of shares issued | 738 | |||||||||||||||||||||||||
Convertible redeemable preferred stock, shares authorized | 10,000 | 10,000 | ||||||||||||||||||||||||
Convertible redeemable preferred stock, par value | $ 0.001 | $ 0.001 | ||||||||||||||||||||||||
Preferred stock redemption price as percentage of liquidation preference | 110.00% | 105.00% | ||||||||||||||||||||||||
Accrual of dividends on convertible preferred stock | 1,360,000 | 31,000 | 218,000 | 129,000 | ||||||||||||||||||||||
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | (6,990,000) | |||||||||||||||||||||||||
Embedded derivative, fair value of embedded derivative liability | 8,600,000 | |||||||||||||||||||||||||
Preferred stock redemption price additional amount with liquidation preference | $ 100,000 |