Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 35,210	$ 58,651
Marketable securities	15,528
Accounts receivable	658	315
Prepaid expenses and other current assets	1,996	1,900
Total current assets	53,392	60,866
Prepaid expenses, long term	632	1,094
Property, plant and equipment, net	1,663	1,989
Total assets	55,687	63,949
Current liabilities:
Accounts payable and accrued expenses (note 6)	2,929	2,625
Deferred revenue		157
Total current liabilities	2,929	2,782
Deferred tenant inducements	101	133
Total liabilities	3,030	2,915
Shareholders’ equity:
Common shares, without par value; unlimited shares authorized; issued and outstanding: 14,415,347 (December 31, 2015 - 14,385,336)	148,867	148,634
Additional paid-in capital	33,752	33,083
Accumulated deficit	(128,972)	(119,693)
Accumulated other comprehensive loss	(990)	(990)
Shareholders' equity	52,657	61,034
Total liabilities and shareholders’ equity	55,687	63,949
Commitments and contingencies (note 9)

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.