The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

No definition available.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Stock-Based Compensation Arrangements (Stock options and restricted stock outstanding and exercisable) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	21,657,776	4,523,900	5,884,050
Outstanding, Weighted Avg. Exercise Price	$ 0.21	$ 0.39	$ 0.43
Exercisable, Shares	3,665,124	1,645,161
Exercisable, Weighted Avg. Exercise Price	$ 0.32	$ 0.43
Stock Option Or Restricted Stock Outstanding [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	21,657,776
Outstanding, Weighted Avg. remaining contractual life	8 years 10 months 24 days
Outstanding, Weighted Avg. Exercise Price	$ 0.21
Aggregate intrinsic value	$ 0
Stock Option Or Restricted Stock Outstanding [Member] \| $0.01-$1.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	21,612,776
Outstanding, Weighted Avg. remaining contractual life	8 years 11 months 1 day
Outstanding, Weighted Avg. Exercise Price	$ 0.21
Stock Option Or Restricted Stock Outstanding [Member] \| $1.01-$2.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	45,000
Outstanding, Weighted Avg. remaining contractual life	2 years 3 months
Outstanding, Weighted Avg. Exercise Price	$ 1.40
Stock Option Or Restricted Stock Outstanding [Member] \| $2.01-$3.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	0
Outstanding, Weighted Avg. remaining contractual life	0 years
Outstanding, Weighted Avg. Exercise Price	$ 0
Stock Option Or Restricted Stock Outstanding [Member] \| $3.01-$4.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	0
Outstanding, Weighted Avg. remaining contractual life	0 years
Outstanding, Weighted Avg. Exercise Price	$ 0
Stock Option Or Restricted Stock Outstanding [Member] \| $4.01-$5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Shares	0
Outstanding, Weighted Avg. remaining contractual life	0 years
Outstanding, Weighted Avg. Exercise Price	$ 0
Stock Option Or Restricted Stock Exercisable [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	3,665,124
Exercisable, Weighted Avg. Exercise Price	$ 0.37
Aggregate intrinsic value	$ 0
Stock Option Or Restricted Stock Exercisable [Member] \| $0.01-$1.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	3,620,124
Exercisable, Weighted Avg. Exercise Price	$ 0.35
Stock Option Or Restricted Stock Exercisable [Member] \| $1.01-$2.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	45,000
Exercisable, Weighted Avg. Exercise Price	$ 1.40
Stock Option Or Restricted Stock Exercisable [Member] \| $2.01-$3.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	0
Exercisable, Weighted Avg. Exercise Price	$ 0
Stock Option Or Restricted Stock Exercisable [Member] \| $3.01-$4.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	0
Exercisable, Weighted Avg. Exercise Price	$ 0
Stock Option Or Restricted Stock Exercisable [Member] \| $4.01-$5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercisable, Shares	0
Exercisable, Weighted Avg. Exercise Price	$ 0