Revenue Recognition and Sales Returns Reserves (Details) (USD $)	1 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2012 Allowance for Sales Returns [Member]	Jun. 30, 2011 Allowance for Sales Returns [Member]	Jun. 30, 2012 Prior Period Sales [Member] Allowance for Sales Returns [Member]	Jun. 30, 2011 Prior Period Sales [Member] Allowance for Sales Returns [Member]	Jun. 30, 2012 Current Period Sales [Member] Allowance for Sales Returns [Member]	Jun. 30, 2011 Current Period Sales [Member] Allowance for Sales Returns [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Milestone payments earned	$ 5,000,000
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		1,429,598	2,663,648
Sales allowances		(100,000)	52,487	(100,000)	0	0	52,487
Sales returns		(109,787)	(464,682)	(109,787)	(464,682)	0	0
Balance at end of quarter		$ 1,219,811	$ 2,251,453