Restructuring And Related Costs, Expected Number Of Positions Eliminated, Percent

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- Definition

Restructuring Charges Before Gain (Loss) Due to Curtailment

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- Definition

Amount of expense for employee benefit and equity-based compensation.

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of loss from impairment of right-of-use asset from operating lease.

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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- Definition

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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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Restructuring Costs - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
Restructuring Costs - Narrative (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 1,866,000	$ 65,000	$ 4,600,000	$ 268,000
Fixed asset impairment						$ 66,087,000
2019 French Restructuring Obligation
Restructuring Cost and Reserve [Line Items]
Restructuring costs	1,259		3,198,000
Fixed asset impairment			598,000
Operating lease, impairment loss			826,000
Restructuring reserve	895,000		895,000			0
2019 French Restructuring Obligation \| Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Severance costs					$ 3,500,000
2019 French Restructuring Obligation \| Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	884,000		884,000			11,000
2019 Corporate Restructuring Obligations
Restructuring Cost and Reserve [Line Items]
Restructuring costs	607,000		1,570,000
Restructuring reserve	853,000		853,000			0
Share-based compensation forfeitures related to the employees affected by the global reduction in workforce			1,396,000
2019 Corporate Restructuring Obligations \| Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Severance costs					$ 3,000,000
Lyon France Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring costs			168,000	268,000
Charges for employee severance, benefits and other			(168,000)	268,000
Restructuring reserve	$ 38,000	$ 581,000	38,000	$ 581,000		$ 879,000	$ 1,000,000
Retirement Indemnity Obligation \| 2019 French Restructuring Obligation
Restructuring Cost and Reserve [Line Items]
Restructuring costs			1,000,000
Employee Severance \| 2019 French Restructuring Obligation
Restructuring Cost and Reserve [Line Items]
Charges for employee severance, benefits and other			$ 2,774,000
Employee Severance \| Corporate Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated (as a percent)	50.00%		50.00%
Employee Severance \| 2019 Corporate Restructuring Obligations
Restructuring Cost and Reserve [Line Items]
Restructuring costs			$ 2,966,000
Employee Severance \| Lyon France Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated (as a percent)								50.00%