Subsequent Events(Additional Information) (Detail) (USD $)	12 Months Ended			1 Months Ended		3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Jul. 30, 2013	Jan. 02, 2015	Mar. 31, 2015	Aug. 05, 2013	Dec. 31, 2012
Subsequent Event [Line Items]
Stock Issued During Period, Value, New Issues		$ 8,050,000
Stockholders' Equity Attributable To Parent	(14,398,011)	(13,038,293)						(6,209,565)
Derivative Liability, Noncurrent	13,541,138	12,035,816
Preferred Stock Shares Outstanding	0	0
Preferred Stock Shares Outstanding In Percent liquidation or amendment actions	60.00%
Cash, Period Increase (Decrease)	24,750,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period	10,819	0
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 2.25
Proceeds from Warrant Exercises	2,682,669	56,250
Class Of Warrant Or Right Outstanding	5,236,660	7,147,775						656,641
Debt Conversion, Converted Instrument, Amount	625,000	2,882,333
Payments of Stock Issuance Costs	0	1,204,779
Convertible Notes Payable	2,806,942
Common Stock [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues		4,025,000	[1]
Stock Issued During Period, Value, New Issues		4,025
Stockholders' Equity Attributable To Parent	11,296	9,600						3,537
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred Stock, Dividend Rate, Percentage	6.00%
Preferred Stock Shares Outstanding In Percent	25.00%
Preferred Stock Shares Outstanding	12,406
Series A Preferred Stock [Member] | Director One [Member]
Subsequent Event [Line Items]
Preferred Stock Shares Outstanding In Percent	40.00%
Series A Preferred Stock [Member] | Director Two [Member]
Subsequent Event [Line Items]
Preferred Stock Shares Outstanding In Percent	20.00%
Series A Private Placement [Member]
Subsequent Event [Line Items]
Warrants Outstanding Percentage				86.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Preferred Stock, Liquidation Preference Per Share	$ 1,000
Stockholders' Equity Attributable To Parent	(14,398,011)				22,400,000
Derivative Liability, Noncurrent					1,390,880
Class Of Warrant Or Right Outstanding						537,102
Debt Conversion, Converted Instrument, Amount						337,500
Payments of Stock Issuance Costs					150,000
Convertible Notes Payable						2,037,500
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion					100
Debt Conversion, Converted Instrument, Shares Issued						150,000
Debt Instrument, Convertible, Number of Equity Instruments						905,556
Subsequent Event [Member] | Common Stock [Member] | Stock Plan 2014 [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross						295,000
Subsequent Event [Member] | Common Stock [Member] | Investor Relations Services [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross						40,000
Subsequent Event [Member] | Series A [Member]
Subsequent Event [Line Items]
Shares Issued, Price Per Share					$ 5.00
Conversion of Stock, Amount Converted					500
Subsequent Event [Member] | August 2013 stock offering [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period						4,665,892
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 2.25
Proceeds from Warrant Exercises						1,135,125
Class Of Warrant Or Right Outstanding						65,100
Subsequent Event [Member] | August 2013 stock offering [Member] | Cash [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period						504,500
Subsequent Event [Member] | August 2013 stock offering [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period						3,551,281
Subsequent Event [Member] | Intel Corporation [Member] | Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Stock Issued During Period, Shares, New Issues					49,626
Shares Issued, Price Per Share					$ 500
Stock Issued During Period, Value, New Issues					$ 24,813,000
Conversion of Stock, Description					Each share of Series A Preferred Stock is convertible, at the option of the Series A Purchaser, into 100 shares of the Company’s common stock (determined by dividing the Series A Original Issue Price of $500 by the Series A Conversion Price. The Series A Conversion Price is $5.00, subject to adjustment in the event of stock splits, dividends or other combinations).
Subsequent Event [Member] | Cashless [Member] | August 2013 stock offering [Member]
Subsequent Event [Line Items]
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period						4,161,392

[1] All share amounts for all periods reflect the Company’s 1-for-75 reverse stock split, which was effective February 6, 2013.