Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net income (loss)	$ (9,156)	$ 1,373
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	207	175
Stock-based compensation	5,219	186
Deferred tenant inducements	(16)	(17)
Unrealized foreign exchange loss	3,140	37
Changes in operating assets and liabilities:
Accounts receivable	(996)	2
Prepaid expenses, and other current assets	220	29
Accounts payable and accrued expenses	(1,110)	(265)
Deferred revenue	(3,055)	(2,362)
Net cash used in operating activities	(5,547)	(842)
Investing activities:
Purchases of property, plant and equipment	(84)	(480)
Purchase of marketable securities		(2,578)
Proceeds from marketable securities	1,575	2,720
Net cash provided by (used in) investing activities	1,491	(338)
Financing activities:
Deferred financing fees		(398)
Proceeds from issuance of common shares	127	5
Net cash provided by (used in) financing activities	127	(393)
Effect of exchange rate changes on cash and cash equivalents	(2,180)	(1,430)
Decrease in cash and cash equivalents	(6,109)	(3,003)
Cash and cash equivalents, beginning of period	72,026	37,950
Cash and cash equivalents, end of period	65,917	34,947
Supplemental disclosures:
Interest received	121	125
Supplemental disclosures of non-cash transactions:
Issuance of common shares on conversion of subscription rights		$ 14
Fair value of options exercised on a cashless basis	$ 69