CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net (loss)	$ (9,902)	$ (27,608)	$ (26,924)
Adjustments to reconcile net (loss) to net cash used in operating activities:
Depreciation and amortization	25	36	71
Stock-based compensation	8,189	7,563	6,162
Net change in deferred taxes	0	0	3,158
Change in value of derivative liability	(2,238)	(1,608)	927
Changes in assets and liabilities:
Prepaid expenses and other current assets	(296)	(243)	(23)
Prepaid expenses - Non-current	(3,144)	0	0
Prepaid taxes	0	14,963	(4,934)
Deferred revenue	1,333	667	0
Accounts payable and accrued liabilities	1,806	(1,449)	1,970
Royalty payable	6,100	0	0
Related-party payable	81	0	0
Income tax liability	13	395	0
Net cash provided by (used in) operating activities	1,967	(7,284)	(19,593)
Cash flows from investing activities:
Purchase of property and equipment	(35)	(7)	(37)
Purchase of investments	(45,500)	(92,729)	(59,342)
Proceeds from sale or maturity of investments	42,766	99,362	47,299
Net cash provided by (used in) investing activities	(2,769)	6,626	(12,080)
Cash flows from financing activities:
Proceeds from exercise of options	278	170	1,691
Proceeds from exercise of warrants	9	0	161
Net cash provided by financing activities	287	170	1,852
Net decrease in cash and cash equivalents	(515)	(488)	(29,821)
Cash and cash equivalents, beginning of year	19,173	19,661	49,482
Cash and cash equivalents, end of year	18,658	19,173	19,661
Supplemental disclosure of cash flow information:
Cash paid during the year for taxes	2	0	0
Cash paid during the year for interest	$ 0	$ 0	$ 0