CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPRENESIVE INCOME (LOSS) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues:
Royalty revenue	$ 1	$ 0	$ 5	$ 0
Total revenues	1	0	5	0
Operating expenses:
Research and development	805	919	2,831	1,822
Selling, general and administrative	2,336	1,270	4,558	2,711
Total operating expenses	3,141	2,189	7,389	4,533
Operating loss	(3,140)	(2,189)	(7,384)	(4,533)
Non-operating income:
Investment income	71	11	81	22
Gain (loss) on sales of marketable securities	(7)	0	9	0
Other income (expense)	0	(1)	0	(1)
Total other income	64	10	90	21
Loss before income taxes	(3,076)	(2,179)	(7,294)	(4,512)
Provision for income taxes	0	0	0	0
Net loss	(3,076)	(2,179)	(7,294)	(4,512)
Other comprehensive income (loss):
Unrealized gains (losses) on securities	(131)	0	(79)	0
Total other comprehensive income (loss)	(131)	0	(79)	0
Comprehensive income (loss)	$ (3,207)	$ (2,179)	$ (7,373)	$ (4,512)
Income (loss) per share:
Basic	$ (0.07)	$ (0.05)	$ (0.16)	$ (0.10)
Diluted	$ (0.07)	$ (0.05)	$ (0.16)	$ (0.10)
Weighted average shares outstanding:
Basic	47,228	47,521	47,215	47,519
Diluted	47,228	47,521	47,215	47,519