Other Non-Current Liabilities - Summary of Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Liabilities, Noncurrent [Abstract]
Retirement benefits	$ 10,518	$ 9,604
Contingent consideration	6,600	9,000
Deferred transition revenue	2,069	995
Derivative instruments	1,613	1,785
Unrecognized tax benefits	2,056	1,068
Finance lease liabilities	237	229
Others	103	120
Other non-current liabilities	$ 23,196	$ 22,801
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other non-current liabilities	Other non-current liabilities