Share-Based Compensation Share-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended								6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Stock Option [Member]	Jun. 30, 2013 Warrants	Jun. 30, 2012 Warrants	Dec. 31, 2012 Warrants	Jun. 30, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2013 Cost of revenue	Jun. 30, 2012 Cost of revenue	Jun. 30, 2013 Cost of revenue	Jun. 30, 2012 Cost of revenue	Jun. 30, 2013 Research and development	Jun. 30, 2012 Research and development	Jun. 30, 2013 Research and development	Jun. 30, 2012 Research and development	Jun. 30, 2013 Selling, general and administrative	Jun. 30, 2012 Selling, general and administrative	Jun. 30, 2013 Selling, general and administrative	Jun. 30, 2012 Selling, general and administrative	Jun. 30, 2013 Stock Option [Member]	Jun. 30, 2012 Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,095,700	$ 1,086,400	$ 3,314,200	$ 3,555,000								$ 58,500	$ 16,400	$ 145,000	$ 100,300	$ 129,800	$ 98,900	$ 347,100	$ 260,200	$ 907,400	$ 971,100	$ 2,822,100	$ 3,194,500
Unrecognized compensation cost					1,441,700	24,100					305,200
Expected weighted-average period in years of compensation cost to be recognized					1 year 4 months 28 days	5 months 19 days					2 months 27 days
Total fair value of shares vested						$ 80,900	$ 43,600																	$ 1,646,300	$ 3,063,200
Weighted average estimated fair value of shares granted						$ 3.51		$ 3.19	$ 4.58	$ 3.38