Stock-Based Compensation - Schedule of Standard and Market-based Stock Options Activity (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Standard Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding balance	3,486,157	3,227,167
Granted	260,175	604,620
Exercised	(10,862)	(205,744)
Forfeited	(60,317)	(102,454)
Expired	0	(37,432)
Ending outstanding balance	3,675,153	3,486,157
Aggregate intrinsic value of options exercised	$ 30,000	$ 1,125,000
Weighted average fair value of options granted	$ 3.84	$ 4.93
Market Condition Based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning outstanding balance	50,000	0
Granted	150,000	50,000
Exercised	0	0
Forfeited and cancelled	0	0
Ending outstanding balance	200,000	50,000
Aggregate intrinsic value of options exercised	$ 0	$ 0
Weighted average fair value of options granted	$ 3.64	$ 5.71

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ 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 (d)(2)

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

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- Definition

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ 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)(iv)(4)

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ 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)(iv)(3)-(4)

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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-Publisher FASB

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Net number of share options (or share units) granted during the period.

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- Definition

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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- Definition

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

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- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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