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Shareholders' Equity (Summary of Allocation of Stock-Based Compensation Expenses) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 2,355 | $ 2,424 | $ 2,425
Unrecognized compensation costs related to outstanding stock options and RSUs | $ 1,313 |  |
Unrecognized compensation costs related to outstanding stock options and RSUs, period for recognition | 10 months 17 days |  |
Cost Of Sales [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 437 | 372 | 320
Research And Development Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 900 | 953 | 832
Selling And Marketing Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 493 | 569 | 537
General And Administrative Expense [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 525 | $ 530 | $ 736

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