Stock Option Plans (Additional Information) (Detail) (USD $)	12 Months Ended
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Weighted average remaining contractual term on unvested options	6 years 9 months 18 days
Exercisable Options Outstanding Shares	257,786
Weighted average exercise price per share	$ 7.72
Unvested Options Outstanding, Shares	462,384
Unvested Options Outstanding, Weighted average exercise price	$ 2.63
Unvested Options Outstanding Weighted average remaining life (yrs)	9 years 7 months 6 days
Unrecognized stock compensation expense	$ 1,100,000
Weighted average recognition period	2 years 1 month 6 days
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized	1,178,051
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 268,000
Employee Stock Option Plan
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Percentage Of Stock Option Vesting Period	20.00%
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum	10.00%
Non Employee Director
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Percentage Of Stock Option Vesting Period	50.00%
stock option plans [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Unvested Options Outstanding, Shares	462,765

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Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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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.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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-Publisher FASB

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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.

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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.

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Percentage Of Stock Option Vesting Period

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Weighted Average Exercise Price

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