Restructuring Costs - Narrative (Details) - USD ($) $ in Thousands	17 Months Ended
	May 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
2019 French Restructuring Obligation
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		$ 765	$ 1,922
2019 French Restructuring Obligation | Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		765
2019 Corporate Restructuring Obligations
Restructuring Cost and Reserve [Line Items]
Restructuring reserve		$ 940	$ 1,080	$ 644	$ 0
2019 Corporate Restructuring Obligations | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 3,000
Employee Severance | Corporate Workforce Reduction
Restructuring Cost and Reserve [Line Items]
Expected number of positions eliminated (as a percent)				50.00%