Statements of Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statements of Comprehensive Income
Net sales	$ 226	$ 252	$ 223
Cost of sales	(98)	(91)	(77)
Gross profit	128	161	146
Operating Expenses:
Research and development	2,483	1,675	2,521
Selling, general and administrative	3,167	2,755	1,326
Milestone expense			5,000
Operating loss	(5,522)	(4,269)	(8,701)
Interest income	15	19	12
Interest expense			(1)
Realized gain on sale of short-term investments			46
Change in fair value of investor stock purchase option			(2,290)
Net loss before income tax	(5,507)	(4,250)	(10,934)
Income tax benefit			42
Net loss	(5,507)	(4,250)	(10,892)
Other Comprehensive Income:
Unrealized gain (loss) on available-for-sale securities	3	(3)	13
Reclassification of unrealized gain on available-for-sale securities			(46)
Comprehensive loss	$ (5,504)	$ (4,253)	$ (10,925)
Basic and diluted net loss per share (in dollars per share)	$ (0.34)	$ (0.27)	$ (0.81)
Weighted average shares outstanding - basic and diluted (in shares)	16,402,363	15,557,969	13,431,661