Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands, € in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 EUR (€)	Apr. 16, 2019 USD ($)	Apr. 16, 2019 EUR (€)
ARGES GmbH
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	$ 5,100	€ 4.1	$ 7,870	€ 7.1
Ingenia-CAT, S.L.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	2,900	€ 2.3			$ 6,600	€ 5.8
Significant Other Unobservable Inputs (Level 3) | ARGES GmbH
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	$ 5,086
Valuation Technique	novt:ValuationTechniqueMonteCarloMethodMember	novt:ValuationTechniqueMonteCarloMethodMember
Significant Other Unobservable Inputs (Level 3) | ARGES GmbH | Revenue volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	21.0	21.0
Significant Other Unobservable Inputs (Level 3) | ARGES GmbH | Cost of debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	2.6	2.6
Significant Other Unobservable Inputs (Level 3) | ARGES GmbH | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	3.7	3.7
Significant Other Unobservable Inputs (Level 3) | Ingenia-CAT, S.L.
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	$ 2,871
Valuation Technique	novt:ValuationTechniqueMonteCarloMethodMember	novt:ValuationTechniqueMonteCarloMethodMember
Significant Other Unobservable Inputs (Level 3) | Ingenia-CAT, S.L. | Revenue volatility
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	38.5	38.5
Significant Other Unobservable Inputs (Level 3) | Ingenia-CAT, S.L. | Cost of debt
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	3.1	3.1
Significant Other Unobservable Inputs (Level 3) | Ingenia-CAT, S.L. | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Business acquisition, Percentage Applied	9.6	9.6
Significant Other Unobservable Inputs (Level 3) | Other
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration	$ 3,599
Valuation Technique	us-gaap:ValuationTechniqueDiscountedCashFlowMember	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Significant Other Unobservable Inputs (Level 3) | Other | Discount rate
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Asset acquisition, Percentage Applied	22.8	22.8