Share-Based Compensation Share-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended								9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Stock Option [Member]	Sep. 30, 2013 Warrants	Sep. 30, 2012 Warrants	Dec. 31, 2012 Warrants	Sep. 30, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2013 Cost of revenue	Sep. 30, 2012 Cost of revenue	Sep. 30, 2013 Cost of revenue	Sep. 30, 2012 Cost of revenue	Sep. 30, 2013 Research and development	Sep. 30, 2012 Research and development	Sep. 30, 2013 Research and development	Sep. 30, 2012 Research and development	Sep. 30, 2013 Selling, general and administrative	Sep. 30, 2012 Selling, general and administrative	Sep. 30, 2013 Selling, general and administrative	Sep. 30, 2012 Selling, general and administrative	Sep. 30, 2013 Stock Option [Member]	Sep. 30, 2012 Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 2,127,600	$ 1,916,200	$ 5,412,500	$ 5,471,200								$ 88,800	$ 19,800	$ 233,700	$ 120,100	$ 319,900	$ 102,200	$ 667,000	$ 362,400	$ 1,718,900	$ 1,794,200	$ 4,511,800	$ 4,988,700
Unrecognized compensation cost					3,101,800	16,200					588,700
Expected weighted-average period in years of compensation cost to be recognized					4 years 26 days	2 months 27 days					6 months 26 days
Total fair value of shares vested						$ 123,000	$ 121,600																	$ 2,470,000	$ 3,637,800
Weighted average estimated fair value of shares granted						$ 3.45		$ 4.32	$ 4.30	$ 3.63