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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended
	Sep. 03, 2013	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Mar. 30, 2014	Dec. 06, 2013	Dec. 31, 2012
Accounting Policies [Line Items]
Retained Earnings (Accumulated Deficit)			$ 135,900,000
Net Income Loss Attributable To Parent			(37,652,000)us-gaap_NetIncomeLoss	(28,358,000)us-gaap_NetIncomeLoss
Reverse stock split, ratio	1.1533	0.2
Common stock, shares issued		48,855,255us-gaap_CommonStockSharesIssued	63,182,806us-gaap_CommonStockSharesIssued	48,841,417us-gaap_CommonStockSharesIssued	244,276,923us-gaap_CommonStockSharesIssued		5,391,095us-gaap_CommonStockSharesIssued
Common stock, shares outstanding		48,855,255us-gaap_CommonStockSharesOutstanding	63,182,806us-gaap_CommonStockSharesOutstanding	48,841,417us-gaap_CommonStockSharesOutstanding	244,276,923us-gaap_CommonStockSharesOutstanding
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001	$ 0.001		$ 0.001	$ 0.001
Total restricted cash			250,000	375,000
Investments			0us-gaap_Investments
Gross realized gains or losses			0us-gaap_RealizedInvestmentGainsLosses	0us-gaap_RealizedInvestmentGainsLosses
Unrealized gains or losses			0us-gaap_UnrealizedGainLossOnInvestments
Impairment charges			0	0
Allocated share based compensation expense			0
Patents [Member]
Accounting Policies [Line Items]
Amortization period			10 years
Stock Options [Member]
Accounting Policies [Line Items]
Allocated share based compensation expense			$ 1,840,000	$ 941,000
Maximum [Member]
Accounting Policies [Line Items]
Amortization period			10 years
Accounts Receivable [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			74.00%	61.00%
Sales [Member] \| Customer One [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			10.00%	37.00%
Sales [Member] \| Customer Two [Member]
Accounting Policies [Line Items]
Concentration Risk Percentage			37.00%
Merger Agreement [Member]
Accounting Policies [Line Items]
Exchange ratio	1.1533
Common stock, shares outstanding	12,350,000
Common stock, par value (in dollars per share)	0.001
Amortization period	5 years