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Restructuring Costs - Narrative (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2019
--- | --- | --- | ---
2019 French Restructuring Obligation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 117 | $ 248 |
2019 French Restructuring Obligation | Accrued Liabilities |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | 117 |  |
Corporate Workforce Reduction | Employee Severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected number of positions eliminated (as a percent) |  |  | 50.00%
2019 Corporate Restructuring Obligations |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring reserve | $ 170 | $ 272 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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