7. Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2015

Notes to Financial Statements

Summary of stock option activity

	Three Month Period Ended
	March 31, 2015
				Wtd. Avg.
				Exercise
	Options			Price
Outstanding at beginning of year		1,390,770		$	1.50
Exercised		(22,242	)		1.12
Outstanding at March 31, 2015		1,368,528		$	1.51
Stock options exercisable at March 31, 2015		1,233,272		$	1.34

Stock compensation expense

	Three Month Period Ended
	March 31,
	2015		2014
Research and development costs	$	6,944	$	8,135
Sales and marketing costs		5,755		2,723
General and administrative costs		7,773		26,165
Cost of product sales		13,037		14,596
Total	$	33,509	$	51,619