UK's R&D Tax Relief Scheme (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 segment	Dec. 31, 2018 USD ($)
Other Income and Expenses [Abstract]
Claims recognized in current period | $		$ 10,100
Number of claims for refundable cash credit | segment	2
Tax relief eligibility period after end of tax year	2 years