Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash	$ 177,695	$ 210,643
Restricted cash	786	787
Prepaid expenses and other assets, current	50,388	37,826
Total current assets	228,869	249,256
Non-current assets:
Property and equipment, net	32,755	28,164
Right of use assets, net	49,535	23,409
Long-term deposits	2,446	2,040
Prepaid expenses and other assets, non-current	2,890	0
Deferred tax asset	410	410
Intangible assets, net	172	254
Total assets	317,077	303,533
Current liabilities:
Accounts payable	1,997	1,075
Accrued expenses and other liabilities	25,400	21,398
Lease liabilities	3,413	2,511
Total current liabilities	30,810	24,984
Non-current liabilities:
Lease liabilities	49,456	23,710
Total liabilities	80,266	48,694
Shareholders' equity:
Additional paid-in capital	590,369	500,560
Accumulated other comprehensive loss	(17,296)	(8,691)
Accumulated deficit	(336,383)	(237,150)
Total shareholders' equity	236,811	254,839
Total liabilities and shareholders' equity	317,077	303,533
Ordinary shares
Shareholders' equity:
Share value	3	2
Deferred shares
Shareholders' equity:
Share value	0	0
Deferred B Shares
Shareholders' equity:
Share value	118	118
Deferred C Shares
Shareholders' equity:
Share value	$ 0	$ 0

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).