Consolidated Balance Sheets - USD ($)	Dec. 31, 2018	Sep. 30, 2018	Sep. 30, 2017
Current assets:
Cash	$ 217,450,000	$ 246,984,000	$ 137,070,000
Restricted cash	105,000	105,000	0
Prepaid expenses and other current assets	15,411,000	12,189,000	5,412,000
Total current assets	232,966,000	259,278,000	142,482,000
Non-current assets:
Property and equipment, net	19,968,000	13,528,000	6,180,000
Long-term deposits	1,276,000	0	0
Intangible assets, net	0	399,000	0
Total assets	254,210,000	273,205,000	148,662,000
Current liabilities:
Accounts payable	2,022,000	3,036,000	1,946,000
Accrued expenses and other liabilities	19,054,000	14,103,000	3,087,000
Total current liabilities	21,076,000	17,139,000	5,033,000
Non-current liabilities:
Long-term lease incentive obligation	207,000	221,000	265,000
Other long-term payables	285,000	380,000	763,000
Total liabilities	21,568,000	17,740,000	6,061,000
Shareholders' equity:
Additional paid-in capital	361,311,000	357,918,000	194,351,000
Accumulated other comprehensive loss	(15,488,000)	(9,920,000)	(3,849,000)
Accumulated deficit	(113,301,000)	(92,653,000)	(47,902,000)
Total shareholders' equity	232,642,000	255,465,000	142,601,000
Total liabilities and shareholders' equity	254,210,000	273,205,000	148,662,000
Ordinary shares
Shareholders' equity:
Shares value	2,000	2,000	1,000
Deferred Shares
Shareholders' equity:
Shares value	0	0	0
Deferred B shares
Shareholders' equity:
Shares value	118,000	118,000	0
Deferred C shares
Shareholders' equity:
Shares value	$ 0	$ 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).

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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).