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Stock-Based Awards - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 1.75
Upper range limit	$ 9.45
Number Outstanding at December 31, 2013	7,844,691
Weighted- Average Remaining Contractual Life in Years	3 years 8 months 12 days
Weighted- Average Exercise Price, option outstanding	$ 1.29
Number Exercisable at December 31, 2013	7,345,941
Weighted- Average Exercise Price, option exercisable	$ 1.09
Aggregate Intrinsic Value at December 31, 2013	$ 122,056
Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 0.03
Upper range limit	$ 0.16
Number Outstanding at December 31, 2013	1,701,953
Weighted- Average Remaining Contractual Life in Years	7 months 6 days
Weighted- Average Exercise Price, option outstanding	$ 0.10
Number Exercisable at December 31, 2013	1,701,953
Weighted- Average Exercise Price, option exercisable	$ 0.10
Aggregate Intrinsic Value at December 31, 2013	29,967
Range Two [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 0.70
Upper range limit	$ 0.70
Number Outstanding at December 31, 2013	2,525,000
Weighted- Average Remaining Contractual Life in Years	5 years 1 month 6 days
Weighted- Average Exercise Price, option outstanding	$ 0.70
Number Exercisable at December 31, 2013	2,375,000
Weighted- Average Exercise Price, option exercisable	$ 0.70
Aggregate Intrinsic Value at December 31, 2013	40,399
Range Three [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 1.07
Upper range limit	$ 1.28
Number Outstanding at December 31, 2013	1,935,689
Weighted- Average Remaining Contractual Life in Years	2 years 10 months 24 days
Weighted- Average Exercise Price, option outstanding	$ 1.07
Number Exercisable at December 31, 2013	1,935,689
Weighted- Average Exercise Price, option exercisable	$ 1.07
Aggregate Intrinsic Value at December 31, 2013	32,208
Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 2.03
Upper range limit	$ 4.03
Number Outstanding at December 31, 2013	1,017,049
Weighted- Average Remaining Contractual Life in Years	4 years 6 months
Weighted- Average Exercise Price, option outstanding	$ 2.22
Number Exercisable at December 31, 2013	978,299
Weighted- Average Exercise Price, option exercisable	$ 2.20
Aggregate Intrinsic Value at December 31, 2013	15,178
Range Five [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 5.05
Upper range limit	$ 5.05
Number Outstanding at December 31, 2013	400,000
Weighted- Average Remaining Contractual Life in Years	7 years 1 month 6 days
Weighted- Average Exercise Price, option outstanding	$ 5.05
Number Exercisable at December 31, 2013	250,000
Weighted- Average Exercise Price, option exercisable	$ 5.05
Aggregate Intrinsic Value at December 31, 2013	3,165
Range Six [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 6.36
Upper range limit	$ 6.82
Number Outstanding at December 31, 2013	170,000
Weighted- Average Remaining Contractual Life in Years	7 years 4 months 24 days
Weighted- Average Exercise Price, option outstanding	$ 6.52
Number Exercisable at December 31, 2013	70,000
Weighted- Average Exercise Price, option exercisable	$ 6.52
Aggregate Intrinsic Value at December 31, 2013	783
Range Seven [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	$ 7.01
Upper range limit	$ 8.51
Number Outstanding at December 31, 2013	95,000
Weighted- Average Remaining Contractual Life in Years	7 years 8 months 12 days
Weighted- Average Exercise Price, option outstanding	$ 7.50
Number Exercisable at December 31, 2013	35,000
Weighted- Average Exercise Price, option exercisable	$ 7.54
Aggregate Intrinsic Value at December 31, 2013	$ 356

X

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

+ 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)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term of outstanding stock options, 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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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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