Condensed consolidated balance sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents (Note 4)	$ 66,306	$ 76,928
Receivables, prepayments and deposits	1,276	237
Total current assets	67,582	77,165
Property and equipment, net	1,388	400
Operating lease right-of-use asset (Note 2(i))	170
Intangible asset, net (Note 3)	622
Long-term prepayments and deposits	29	53
Total assets	69,791	77,618
Current liabilities
Accounts payable and other liabilities	2,300	4,618
Finance lease liability (Note 5)	65	9
Operating lease liability (Note 5)	200
Total current liabilities	2,565	4,627
Deferred rent		313
Non-current finance lease liability (Note 5)	146	6
Non-current operating lease liability (Note 5)	205
Total liabilities	2,916	4,946
Share capital: (Note 6)
Common stock
Non-voting convertible preferred stock
Additional paid-in capital	358,303	302,759
Accumulated deficit	(291,428)	(230,087)
Total stockholders' equity	66,875	72,672
Total liabilities and stockholders' equity	$ 69,791	$ 77,618