Significant Accounting Policies - Derivative Instruments Measured at Fair Value (Details) - Foreign Exchange Contract - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Prepaid Expenses and Other Current Assets | Cash Flow Hedging
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 90,452	$ 84,968
Derivative Asset, Fair Value	3,315
Prepaid Expenses and Other Current Assets | Fair Value Hedging
Derivative [Line Items]
Derivative Asset, Notional Amount	33,977	26,995
Derivative Asset, Fair Value	$ 17	5
Accrued Expenses And Other Short Term Liabilities | Cash Flow Hedging
Derivative [Line Items]
Derivative Liability, Fair Value		$ (470)