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Amount of the current period expense charged to cost of preservation services for the purpose of reducing deferred preservation costs to amounts that approximate their net realizable value.

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Increase In Net Present Value Of Right-Of-Use Asset

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Number Of Leases With Termination Option

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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For a classified balance sheet, the cumulative difference between the rental income or payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense, by the lessor or lessee, respectively, more than one year after the balance sheet date.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of lessee's right to use underlying asset under operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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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