Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income (loss)	$ (7,988)	$ 2,603
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	492	350
Stock-based compensation	3,446	373
Deferred tenant inducements	(32)	(33)
Unrealized foreign exchange loss	2,353	8
Changes in operating assets and liabilities:
Accounts receivable	31	73
Prepaid expenses, and other current assets	221	18
Accounts payable and accrued expenses	(350)	(126)
Deferred revenue	(6,144)	(6,333)
Net cash used in operating activities	(7,971)	(3,067)
Investing activities:
Purchases of property, plant and equipment	(190)	(497)
Purchase of marketable securities		(2,946)
Proceeds from marketable securities	1,818	4,568
Net cash provided by investing activities	1,628	1,125
Financing activities:
Deferred financing fees		(730)
Proceeds from issuance of common shares	213	4
Net cash provided by (used in) financing activities	213	(726)
Effect of exchange rate changes on cash and cash equivalents	(1,550)	(195)
Decrease in cash and cash equivalents	(7,680)	(2,863)
Cash and cash equivalents, beginning of period	72,026	37,950
Cash and cash equivalents, end of period	64,346	35,087
Supplemental disclosures:
Interest received	268	238
Supplemental disclosures of non-cash transactions:
Issuance of common shares on conversion of subscription rights		$ 27
Fair value of options exercised on a cashless basis	$ 189