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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 08, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares item | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Jan. 01, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Foreign currency translation gain (loss) |  | $ (1,200,000) | $ (2,600,000) | $ 257,000 |
Advertising expense |  | $ 1,700,000 | $ 732,000 | $ 606,000 |
Quarterly cash dividend | $ / shares |  | $ 0 | $ 0 | $ 0 |
Allowance for doubtful accounts |  | $ 966,000 | $ 533,000 |  |
Write-down to inventory |  | 601,000 | 212,000 | $ 1,200,000 |
Write-downs to deferred preservation costs |  | 787,000 | 437,000 | 922,000 |
Net present value of operating lease liability |  | 23,405,000 |  |  |
Operating lease right-of-use assets, net |  | $ 21,994,000 |  |  |
Weighted average discount rate | 5.83% | 5.40% |  |  | 5.50%
Weighted average remaining lease term |  | 5 years 6 months |  |  | 6 years
Deferred rent obligations |  | $ 2,400,000 |  |  |
Option to extend |  | 29 |  |  |
Number of leases with termination option | item |  | 1 |  |  |
Operating lease, termination option, notice period requirement |  | 2 years |  |  |
Increase in net present value of right-of-use asset | $ 3,700,000 |  |  |  |
Minimum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Advertising expense amortization period |  | 6 months |  |  |
Estimated useful lives |  | 3 years |  |  |
Lease terms |  | 1 year |  |  |
Maximum [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Advertising expense amortization period |  | 1 year |  |  |
Estimated useful lives |  | 10 years |  |  |
Lease terms |  | 11 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 |
Net present value of operating lease liability |  |  |  |  | $ 22,700,000
Operating lease right-of-use assets, net |  |  |  |  | $ 22,700,000
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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