Stock-Based Compensation Plans (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011
Compensation expense for share-based payments	$ 2,822,986	$ 5,451,588
Compensation cost capitalized as inventory		152,150
Employee Stock Option Plan [Member]
Unrecognized compensation cost	18,710,704	18,710,704
Non-Employee Director Stock Option Plan [Member]
Unrecognized compensation cost	331,225	331,225
Option expiration period	10	10
Employee Stock Purchase Plan [Member]
Shares approved	1,200,000	1,200,000
ESPP discount rate		85.00%
ESPP discount rate recognized as compensation expense		15.00%
Restricted Stock Plan [Member]
Shares approved	2,000,000	2,000,000
Restricted period, years		10
Unearned stock-based compensation	7,104,904	7,104,904
Amortization expense	$ 495,065	$ 967,987