Consolidated balance sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 143,093	$ 76,928
Receivables, prepayments and deposits	503	237
Total current assets	143,596	77,165
Property and equipment, net (Note 4)	2,060	400
Operating lease right-of-use asset (Note 7(a))	770
Intangible asset, net (Note 5)	567
Long-term prepayments and deposits	30	53
Total assets	147,023	77,618
Current liabilities
Accounts payable and other liabilities (Note 6)	4,125	4,618
Operating lease liability (Note 7)	556
Finance lease liability (Note 7)	62	9
Total current liabilities	4,743	4,627
Non-current operating lease liability (Note 7)	447
Non-current finance lease liability (Note 7)	146	6
Deferred rent		313
Total liabilities	5,336	4,946
Commitments and contingencies (Note 15)	0	0
Share capital:
Common stock—$0.000001 par value—authorized, 100,000,000 as of December 31, 2019 (December 31, 2018—50,000,000); issued and outstanding, 37,996,849 as of December 31, 2019 (December 31, 2018—23,537,368)
Preferred stock—$0.000001 par value—authorized, 5,000,000 as of December 31, 2019 and 2018; nil issued and outstanding as of December 31, 2019 and 2018
Additional paid-in capital	441,216	302,759
Accumulated deficit	(299,529)	(230,087)
Total stockholders' equity	141,687	72,672
Total liabilities and stockholders' equity	$ 147,023	$ 77,618