Statements of Operations and Comprehensive Loss (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues:    
Development revenues $ 4,349 $ 6,800
Commercial revenues 657 1,404
Total revenues 5,006 8,204
Operating expenses:    
Cost of commercial revenues 84 101
Research, development and patents 6,403 7,017
Selling, general and administrative 3,096 3,102
Total operating expenses 9,583 10,220
Loss from operations (4,577) (2,016)
Other income 8 8
Net loss (4,569) (2,008)
Other comprehensive income (loss):    
Unrealized gain (loss) on investments 10 1
Comprehensive loss $ (4,559) $ (2,007)
Net loss per share, basic and diluted (in dollars per share) $ (0.11) $ (0.05)
Shares used in calculating net loss per share, basic and diluted (in shares) 43,499,650 41,466,762