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Shareholders' Equity (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Number of options
Options outstanding, beginning balance	415,510
Granted
Exercised	(1,500)
Expired and forfeited	(17,400)
Options outstanding, ending balance	396,610
Vested and expected to vest		396,610
Exercisable at June 30, 2019	230,884
Weighted average exercise price
Options outstanding, beginning balance	$ 14.62
Granted
Exercised	6.00
Expired and forfeited	15.99
Options outstanding, ending balance	14.59
Vested and expected to vest	14.59
Exercisable at June 30, 2019	$ 12.92
Weighted average remaining contractual term (in years)
Outstanding, beginning balance	2 years 8 months 9 days
Outstanding, ending balance	2 years 2 months 12 days
Vested and expected to vest	2 years 2 months 12 days
Exercisable at June 30, 2019	1 year 9 months 11 days
Aggregate intrinsic value
Outstanding, beginning balance	$ 3
Outstanding, ending balance	$ 2
Vested and expected to vest		$ 2
Exercisable at June 30, 2019		$ 2

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Sharebased Compensation Arrangement By Sharebased Payment Award Aggregate Intrinsic Value [Abstract]

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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

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

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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

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