Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation	$ 532,000us-gaap_ShareBasedCompensation	$ 164,000us-gaap_ShareBasedCompensation
Cash received from option exercised	0	12,000
Company options granted to employees, in shares	232,000	222,000
Stock based compensation expense	532,000	164,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized	2,400,000
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition	3 years 7 days
Non Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company options granted to employees, in shares	240,000
Stock based compensation expense	$ 400,000
Options vested	3333.00%
Option vesting period	2 years
Weighted-average grand date fair values of options granted to non employees	$ 4.44	$ 0.00
Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grand date fair values of options granted to non employees	$ 3.35	$ 4.51

Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Percentage

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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-Publisher FASB

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

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.

+ References

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Topic 230

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-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

-Paragraph 28

-Subparagraph (a)

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- Definition

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

+ References

No definition available.

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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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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