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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Foreign currency translation gain (loss) | $ (2,600,000) | $ 257,000 | $ (170,000)
Advertising expense | $ 732,000 | $ 606,000 | $ 384,000
Quarterly cash dividend | $ 0 | $ 0 | $ 0
Allowance for doubtful accounts | $ 533,000 | $ 697,000 |
Write-down to inventory | 212,000 | 1,200,000 | $ 467,000
Write-downs to deferred preservation costs | $ 437,000 | 922,000 | $ 897,000
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Advertising expense amortization period | 6 months |  |
Estimated useful lives | 3 years |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Advertising expense amortization period | 1 year |  |
Estimated useful lives | 10 years |  |
ESPP Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
ESPP, percentage of market price for eligible employees | 85.00% |  |
RSAs, PSAs, RSUs, PSUs And Stock Options [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
RSAs, PSAs, RSUs, PSUs And Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period within grant date stock options granted typically expire | 7 years |  |
ASU 2016-09 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment |  | 141,000 |
ASU 606 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment | $ 215,000 |  |
Retained Earnings [Member] | ASU 2016-09 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment | (238,000) | (238,000) |
Retained Earnings [Member] | ASU 606 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment | 215,000 |  |
Additional Paid In Capital [Member] | ASU 2016-09 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment | 379,000 | $ 379,000 |
Additional Paid In Capital [Member] | ASU 606 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment |  |  |
Deferred Tax Assets [Member] | ASU 2016-09 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Cumulative-effect adjustment | $ 141,000 |  |

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