Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 718
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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The amount of plan compensation cost recognized during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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Weighted average purchase price of capital shares purchased through an employee stock ownership plan.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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-Name Accounting Standards Codification
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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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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock-Based Compensation Arrangements - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Apr. 06, 2015	Jul. 21, 2015	Dec. 31, 2015	Dec. 31, 2014	Aug. 09, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value			$ 0.16	$ 0.32
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options			$ 2,248,591	$ 835,551
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value			$ 0.0585
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			3 years 1 month 10 days	2 years 7 months 6 days
Granted,Weighted Avg.Exercise Price			$ 0.17	$ 0.35
Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	14,245,227
Granted,Weighted Avg.Exercise Price	$ 0.1525
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights			The options will vest as to 25% of the shares on April 6, 2016, and as to an additional 2.083% of the shares on the last day of each successive month thereafter, provided that he remains employed by Company on the vesting date.
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans			203,879	134,935
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock purchase price			85.00%
Weighted-average purchase price			$ 0.10	$ 0.24
Weighted-average fair value			$ 0.12	$ 0.28
Compensation expense			$ 4,053	$ 5,437
Employee Stock Purchase Plan [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans			203,879	134,935
2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Payment Award, Number of Shares Authorized					8,860,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		30,000,000	6,570,748
2013 Plan [Member] \| Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	2,622,948
2013 Plan [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			30,649,503
2004 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Payment Award, Number of Shares Authorized					2,435,500
Outside of 2013 Plan [Member] \| Employment Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	11,622,279