Annual report pursuant to Section 13 and 15(d)

Preferred Stock - Additional Information (Detail)

Preferred Stock - Additional Information (Detail) - USD ($)							3 Months Ended	12 Months Ended
	Dec. 01, 2014	Jun. 30, 2014	Aug. 22, 2013	May. 15, 2013	Feb. 21, 2013	Dec. 20, 2012	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	May. 14, 2013	Dec. 31, 2012
Preferred Stock [Line Items]
Preferred stock authorized to issue								5,000,000
Preferred stock, shares outstanding								0	0
Accrual of dividends on convertible preferred stock									$ 1,445,000	$ 1,360,000
Business acquisition, number of shares issued								2,929,669	8,035,826
Convertible stock, Conversion of convertible securities	36,300,171
Change in fair value of embedded derivative										(6,990,000)
Embedded derivative, fair value of embedded derivative liability											$ 8,600,000
Debt exchanged with stock, amount									$ 3,736,000
Series C
Preferred Stock [Line Items]
Preferred stock, issued						10,000
Proceeds from issuance of convertible preferred stock						$ 10,000,000
Series C Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock authorized to issue								25,000
Preferred stock , Par value								$ 0.001
Preferred stock, cumulative dividends rate								10.00%
Preferred stock, stated value for cumulative dividends								$ 1,000
Accrual of dividends on convertible preferred stock										1,014,000
Series D Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock authorized to issue								13,000
Preferred stock , Par value								$ 0.001
Preferred stock issued due to investment agreement												11,177
Business acquisition, number of shares issued							738
Liquidation preference per share												$ 100
Convertible stock, Conversion of preferred stock				11,915
Convertible stock, Conversion of convertible securities				1,712,167
Conversion price				$ 0.6959
Series E Redeemable Convertible Preferred Stock
Preferred Stock [Line Items]
Convertible redeemable preferred stock, shares authorized								10,000
Convertible redeemable preferred stock, par value								$ 0.001
Series E Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock, issued					5,000
Proceeds from issuance of convertible preferred stock					$ 5,000,000
Preferred stock, cumulative dividends rate					5.00%
Accrual of dividends on convertible preferred stock										218,000
Series F Redeemable Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock, issued			5,000
Proceeds from issuance of convertible preferred stock			$ 5,000,000
Convertible redeemable preferred stock, shares authorized								10,000
Convertible redeemable preferred stock, par value								$ 0.001
Series G Redeemable Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock authorized to issue								18,000
Preferred stock , Par value								$ 0.001
Preferred stock, issued		18,000
Convertible stock, Conversion of convertible securities		5,404
Conversion price								$ 2.3
Series G Redeemable Convertible Preferred Stock \| Dated April 17, 2014
Preferred Stock [Line Items]
Debt exchanged with stock, shares		10,956,000
Debt exchanged with stock, amount		$ 10,956,000
Series G Redeemable Convertible Preferred Stock \| Dated February 25, 2014
Preferred Stock [Line Items]
Debt exchanged with stock, shares		1,640
Debt exchanged with stock, amount		$ 1,640,085
Series F Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock, cumulative dividends rate			7.00%
Accrual of dividends on convertible preferred stock										$ 129,000
Exchange agreement, shares received		5,000
Series G Convertible Preferred Stock
Preferred Stock [Line Items]
Preferred stock, cumulative dividends rate		9.00%