The period of time, from the grant date until the time at which the share-based award expires.

No definition available.

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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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- 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

Unrecognized cost of unvested options awarded to employees as compensation.

+ References

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

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-Publisher FASB
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- Definition

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.

+ References

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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.

+ References

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.

+ References

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- Definition

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

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- Definition

Purchase price of common stock expressed as a percentage of its fair value.

+ References

No definition available.

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- Definition

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

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Stock-Based Compensation - Plan and Expense Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Stock-Based Compensation
Common stock reserved for future grants (in shares)	102,157		102,157
Compensation cost recognized	$ 3,600	$ 6,000	$ 6,500	$ 11,500
Unrecognized compensation cost	$ 19,800		$ 19,800
Period during which compensation cost is expected to be recognized			3 years
Proceeds from exercise of stock options				$ 1,885
Maximum
Stock-Based Compensation
Number of shares of common stock authorized for issuance	442,750		442,750
Stock Options.
Stock-Based Compensation
Outstanding options (in shares)	18,000		18,000		18,168
Exercise of stock options and related tax benefit (in shares)			0	250
Proceeds from exercise of stock options				$ 2,000
Stock Options. \| Minimum
Stock-Based Compensation
Price range of stock award (as a percent)			85.00%
Period over which options become exercisable			1 year
Stock Options. \| Maximum
Stock-Based Compensation
Price range of stock award (as a percent)			110.00%
Expiration period of options granted			7 years
Period over which options become exercisable			3 years