Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net loss for the period	$ (16,343)	$ (10,452)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization of property and equipment	24	3
Share-based compensation expense (note 4)	981	211
Changes in operating assets and liabilities:
Other receivables	(1)	128
Research and development tax credits receivable	(106)	26
Prepaid expenses	280	(4,100)
Operating lease right of use asset, net	(87)
Accounts payable and accrued liabilities	(2,827)	(571)
Income taxes payable (receivable)		22
Net cash used in operating activities	(18,079)	(14,733)
Financing activities
Issuance of common shares on exercise of share options (note 4)	77	25
Net cash provided by financing activities	77	25
Net increase in cash and cash equivalents during the period	(18,002)	(14,708)
Cash and cash equivalents – Beginning of period	119,818	85,947
Cash and cash equivalents – End of period	$ 101,816	$ 71,239