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Summary Of Significant Accounting Policies (Narrative) (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 08, 2019 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Foreign currency translation gain (loss) |  | $ 1,800,000 | $ (1,200,000) | $ (2,600,000) |
Advertising expense |  | 1,100,000 | 1,700,000 | 732,000 |
Allowance for doubtful accounts |  | 973,000 | 966,000 |  |
Write-down to inventory |  | 1,700,000 | 601,000 | 212,000 |
Write-downs to deferred preservation costs |  | 1,700,000 | 787,000 | $ 437,000 |
Write-down to non-conforming tissues |  | 826,000 |  |  |
Net present value of operating lease liability |  | 19,797,000 | 23,405,000 |  |
Operating lease right-of-use assets, net |  | $ 18,571,000 | $ 21,994,000 |  |
Weighted average discount rate | 5.83% | 5.20% | 5.40% |  | 5.50%
Weighted average remaining lease term |  | 5 years 1 month 6 days | 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] |  |  |  |  |
Net present value of operating lease liability |  |  |  |  | $ 22,700,000
Operating lease right-of-use assets, net |  |  |  |  | $ 22,700,000

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