Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current
Cash	$ 5,581	$ 6,815
Short-term investments	562	4,180
Accounts receivable	466	815
Prepaid expenses	358	462
Investment tax credits receivable	625	416
Inventory	391	375
Total current assets	7,983	13,063
Leasehold improvements and equipment, net	6,374	6,248
Security deposits	737	707
Operating lease right-of-use asset	717
Total assets	15,811	20,018
Current
Accounts payable and accrued liabilities	1,520	2,030
Current portion of long-term debt	740	692
Current portion of operating lease liability	135
Total current liabilities	2,395	2,722
Deferred lease obligations		49
Long-term debt	827	1,140
Convertible debentures	5,424	5,047
Convertible notes	1,159	1,073
Operating lease liability	588
Total liabilities	10,393	10,031
Shareholders' equity
Capital stock, common shares, $0.00001 par value; 200,000,000 shares authorized; 93,527,473 shares issued and outstanding (2018: 93,477,473 common shares)	1	1
Additional paid-in capital	42,250	42,048
Accumulated deficit	(36,039)	(30,896)
Accumulated other comprehensive loss	(794)	(1,166)
Total shareholders' equity	5,418	9,987
Total liabilities and shareholders' equity	$ 15,811	$ 20,018