Percentage of combined voting power of all classes of stock.

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Percentage of fair market value.

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Share based compensation arrangement by share based payment award options nonvested weighted average price per shares.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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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- Definition

The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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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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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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.

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- Definition

The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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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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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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

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

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- Definition

Number of share instruments newly issued under a share-based compensation plan.

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Number of non-vested options outstanding.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
	May 03, 2016	May 31, 2010	Jun. 30, 2004	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)				80,537	97,891
Weighted average exercise price (in usd per share)				$ 19.32	$ 37.95
Weighted average grant-date fair value of options granted (in usd per share)				2.37	6.80
Aggregate instrinsic value of options issued or exercised				$ 0	$ 0
Unrecognized stock-based compensation costs related to non-vested stock options				$ 335,405
Non-vested stock options (in shares)				80,537
Weighted average fair value of non-vested stock options (in usd per share)				$ 19.32
Weighted average period of recognition				2 years 7 months
Stock-based compensation expense				$ 209,691	$ 225,408
2004 Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized (in shares)	600,000
Expiration period				10 years
Shares authorized (in shares)				728,946
Shares issued in period (in shares)				30,162
Shares outstanding (in shares)				80,537
Weighted average exercise price (in usd per share)				$ 19.32
Shares available for future grant (in shares)				618,247
2004 Stock Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
2004 Stock Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
2009 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)				12,500
2004 Stock Plan and 2009 Inducement Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of combined voting power of all classes of stock				10.00%
Percentage of fair value of common stock at date of grant				110.00%
2004 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)			326
Award vesting rights			All of the Companys employees who had been employed by the Company for at least 60 days and whose customary employment is for more than 20 hours per week and for more than five months in any calendar year were eligible to participate and any employee who owned 5% or more of the voting power or value of the Companys stock was not eligible to participate.
2010 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)		217				521
Shares issued in period (in shares)				11,583	4,375
Shares outstanding (in shares)				58
Percentage of fair value of common stock at date of grant				85.00%
Maximum percentage of earnings employee can authorize to withhold, percentage				10.00%
Award vesting rights		1,736 shares, (ii) 1 percent of the shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the Board. At the Companys Annual Meeting of Stockholders held on May 3, 2016, the stockholders of the Company approved the Companys Third Amended and Restated 2010 Employee Stock Purchase Plan (the Amended and Restated 2010 ESPP), which, among other things, increased the number of shares of the Companys common stock authorized for issuance thereunder by 100,000 shares. All of the Companys full-time employees and certain part-time employees are eligible to participate in the Amended and Restated 2010 ESPP. For part-time employees to be eligible, they must have customary employment of more than five months in any calendar year and more than 20 hours per week. Employees who, after exercising their rights to purchase shares under the Amended and Restated 2010 ESPP, would own shares representing 5% or more of the voting power of the Companys common stock, are ineligible to participate.
2004 and 2010 ESPPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash received from option exercises and purchases				$ 20,768	$ 28,538