Condensed consolidated statements of cash flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities
Net loss	$ (8,642)	$ (2,208)
Non-cash items:
Stock-based compensation (Note 5(d))	683	1,078
Depreciation and amortization	171	41
Amortization of operating lease right-of-use assets	528	21
Unrealized foreign exchange (gain) loss	(14)	12
Changes in operating assets and liabilities:
Receivable, prepayments and deposits	266	(403)
Accounts payable and other liabilities	568	(1,297)
Net cash used in operating activities	(6,440)	(2,756)
Investing activities
Purchase of property and equipment	(107)
Net cash used in investing activities	(107)
Financing activities
Proceeds from exercise of stock options	3,392
Payment on finance lease obligations	(2)	(2)
Net cash provided by (used in) financing activities	3,390	(2)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(11)	(1)
Net change in cash, cash equivalents and restricted cash during the period	(3,168)	(2,759)
Cash, cash equivalents and restricted cash, beginning of period	143,093	76,928
Cash, cash equivalents and restricted cash, end of period (Note 3)	139,925	74,169
Supplemental disclosure of cash flow information:
Interest received	$ 435	$ 443