Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current
Cash	$ 6,614	$ 3,945
Short-term investments	3,635	6,004
Accounts receivable	754	680
Prepaid expenses	132	105
Investment tax credits receivable	225	436
Security deposits	208	205
Inventory	88	62
Total current assets	11,656	11,437
Leasehold improvements and equipment, net	5,163	5,213
Security deposits	256	252
Operating lease right-of-use assets	961	1,003
Total assets	18,036	17,905
Current
Accounts payable and accrued liabilities	2,351	2,299
Current portion of operating lease liability	252	249
Current portion of finance lease liability	37	36
Deferred revenue	138	189
Convertible debentures	4,327	4,247
Total current liabilities	7,105	7,020
Long-term debt	5,500	2,500
Convertible notes	4,138	3,709
Operating lease liability	604	642
Finance lease liability	75	84
Deferred income tax liability	0	79
Total liabilities	17,422	14,034
Shareholders' equity
Capital stock, common shares, $0.00001 par value; 450,000,000 shares authorized; 154,651,289 shares issued and outstanding (2021: 154,571,289 common shares)	1	1
Additional paid-in capital	62,842	63,104
Accumulated deficit	(60,526)	(57,863)
Accumulated other comprehensive loss	(1,703)	(1,371)
Total shareholders' equity	614	3,871
Total liabilities and shareholders' equity	$ 18,036	$ 17,905