Stock-Based Compensation Plans (Narrative) (Details) (USD $)	3 Months Ended			3 Months Ended				3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Employee Stock Option Plan [Member]	Apr. 01, 2013 Employee Stock Option Plan [Member] Subsequent Event [Member]	Mar. 31, 2013 Employee Stock Option Plan [Member] Minimum [Member]	Mar. 31, 2013 Employee Stock Option Plan [Member] Maximum [Member]	Mar. 31, 2013 Non-Employee Director Stock Option Plan [Member]	Dec. 31, 2012 Non-Employee Director Stock Option Plan [Member] Amended & Restated Non-employee Director Stock Option Plan [Member]	Mar. 31, 2013 Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments	$ 3,189,211
Compensation cost capitalized as part of inventory	168,143
Option vesting period				1 year	5 years	6 months
Option expiration period				2 years	7 years	10 years
Unrecognized compensation cost		20,087,762
Options granted (in shares)							500,000	2,000,000
Shares approved		1,200,000	1,000,000
ESPP discount rate		85.00%
ESPP discount rate recognized as compensation expense		15.00%
Restricted period, maximum, in years								10 years
Unearned stock-based compensation								9,005,215
Amortization expense	$ 660,852