Share Option Plans and ESPP - Schedule of Non-cash Share-Based Compensation Expenses Related to Company's Equity-Based Awards (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 18,863	$ 16,557	$ 75,721
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	733	590	2,221
Research, development and clinical trials
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	5,124	3,394	18,125
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	4,471	3,616	17,672
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation expense	$ 8,535	$ 8,957	$ 37,703