Percentage of retainer fee to acquire common stock.

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- Definition

Percentage of shares transacted at fair market value.

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- Definition

Share based compensation arrangement by share based payment award to common stock conversion period.

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- Definition

Share based compensation arrangement by share based payment award to common stock conversion ratio.

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- Definition

Share based compensation arrangement by share based payment award to common stock incremental conversion 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.

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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.

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- Definition

Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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- Definition

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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No definition available.

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- Definition

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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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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Stock and Stock-based Compensation - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	May 31, 2011	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional compensation cost that will be recognized in future periods		$ 20,000
Minimum \| Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of retainer fee to acquire common stock		50.00%
Maximum \| Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of retainer fee to acquire common stock		100.00%
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Conversion of stock RSU to Common, ratio		100.00%
Convert to common stock		25.00%
Increment period for awards converted into common stock		4 years
Stock compensation expense		$ 520,000	$ 300,000
Weighted average period additional compensation cost will be expensed		3 years
Restricted Stock Units (RSUs) \| Two Thousand Seven Employee Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for issuance under the plan				2,200,000
Board of Directors Deferred Compensation \| Director \| General and Administrative Expense
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock compensation expense		$ 200,000	$ 80,000
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued in connection with ESPP		7,614	7,151
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock allowed to sell to employees	125,000
Percentage of shares transacted at fair market value	95.00%