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Share-Based Compensation - Textual (Details)		3 Months Ended		9 Months Ended
	Jun. 02, 2017 shares	Sep. 30, 2018 USD ($) plan shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) plan $ / shares shares	Sep. 30, 2017 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans | plan		5		5
Share-based compensation expense		$ 148,000	$ 77,000	$ 332,000	$ 310,000
Unrecognized compensation cost related to non-vested share-based compensation arrangements		$ 0		$ 0
Other than options vested					$ 46,000
Granted (in shares) | shares				0	0
Nonvested and expected to vest (in shares) | shares				63,554
Employee Stock Purchase Plan (ESPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period	3 months
Discount from market price	10.00%
Shares reserved for plan (in shares) | shares	500,000
Shares available for grant (in shares) | shares		489,781		489,781
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deductions	1.00%
Minimum | 2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payroll deductions	15.00%
Maximum | 2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				5 years
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit of stock option compensation expense		$ 3,000	$ 0	$ 142,000	$ 102,000
Restricted Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested share-based compensation arrangements		821,000		$ 821,000
Granted (in dollars per share) | $ / shares				$ 20.76
Weighted average remaining period				2 years 1 month 26 days
Intrinsic value		$ 1,308,000		$ 1,308,000

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Employee Stock Purchase Plan (ESPP), Offering Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Other than Options, Nonvested and Expected to Vest, Exercisable, Number

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Discount rate from fair value on offering date that participants pay for shares.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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