Summary of Significant Accounting Policies - Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 4,555	$ 4,986
Liability Classified Equity Award
Liabilities:
Liabilities measured at fair value on a recurring basis	4,404	4,108
Foreign Currency Forward Contract
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 2
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 2 | Foreign Currency Forward Contract
Liabilities:
Liabilities measured at fair value on a recurring basis	151	878
Level 3
Liabilities:
Liabilities measured at fair value on a recurring basis	4,404	4,108
Level 3 | Liability Classified Equity Award
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 4,404	$ 4,108