Equity (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		3 Months Ended						9 Months Ended				3 Months Ended
	Sep. 30, 2013 Plan	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Warrants [Member]	Dec. 31, 2012 Warrants [Member]	Sep. 30, 2013 Contingent Warrants Related to Private Placement of Common Stock [Member] Warrants [Member]	Sep. 30, 2013 Callable Warrants [Member] Warrants [Member]	Sep. 30, 2013 Other [Member] Warrants [Member]	Sep. 30, 2013 Cost of Products Sold [Member]	Sep. 30, 2012 Cost of Products Sold [Member]	Sep. 30, 2013 Cost of Products Sold [Member]	Sep. 30, 2012 Cost of Products Sold [Member]	Sep. 30, 2013 Research and Development [Member]	Sep. 30, 2012 Research and Development [Member]	Sep. 30, 2013 Research and Development [Member]	Sep. 30, 2012 Research and Development [Member]	Sep. 30, 2013 Selling, General and Administrative [Member]	Sep. 30, 2012 Selling, General and Administrative [Member]	Sep. 30, 2013 Selling, General and Administrative [Member]	Sep. 30, 2012 Selling, General and Administrative [Member]	Sep. 30, 2013 $0.50-$0.76 [Member]	Sep. 30, 2013 $0.87-$1.35 [Member]	Sep. 30, 2013 $1.40-$2.29 [Member]	Sep. 30, 2013 $2.33-$3.75 [Member]	Sep. 30, 2013 $3.95-$6.53 [Member]	Sep. 30, 2013 $6.60-$6.75 [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2012 Minimum [Member]	Sep. 30, 2013 Stock Options [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member] Maximum [Member]	Sep. 30, 2013 Restricted Stock [Member] Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans	3
Outstanding assumed options (in shares)	375,000		375,000
Additional shares authorized by Board of Directors (in shares)	6,000,000
Shares authorized (in shares)	22,500,000		22,500,000
Expenses expected to be recognized over a weighted-average period																																2 years 2 months 24 days	2 years 6 months
Number of shares granted (in shares)																																	419,300
Weighted-average grant date fair value (in dollars per share)																																	$ 5.58
Vesting period																																		3 years	1 year
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock																																	$ 1,894,000
Total unrecognized compensation expense	11,438,000		11,438,000
Number of shares [Roll forward]
Outstanding, beginning of period (in shares)			13,614,135
Granted (in shares)			3,368,000
Exercised (in shares)			(1,610,426)
Unvested options forfeited (in shares)			(179,167)
Vested options expired (in shares)			(52,999)
Outstanding, end of period (in shares)	15,139,543		15,139,543
Vested at end of period (in shares)	6,482,824		6,482,824
Exercisable options, vested and expected to vest (in shares)	14,824,937		14,824,937
Weighted-Average Exercise Price [Roll forward]
Outstanding, weighted average exercise price, beginning of period (in dollars per share)			$ 1.42
Granted, weighted average exercise price (in dollars per share)			$ 5.19
Exercised, weighted average exercise price (in dollars per share)			$ 0.94
Unvested options forfeited weighted-average exercise price (in dollars per share)			$ 3.82
Vested options expired weighted-average exercise price (in dollars per share)			$ 1.11
Outstanding, weighted average exercise price, end of period (in dollars per share)	$ 2.28		$ 2.28
Vested at end of period weighted average exercise price (in dollars per share)	$ 1.25		$ 1.25
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 2.25		$ 2.25
Stock options, additional disclosures [Abstract]
Vested at end of period weighted average remaining contractual term			6 years 7 months 6 days
Vested and expected to vest, weighted average remaining contractual term			7 years 10 months 24 days
Outstanding intrinsic value	31,918,608		31,918,608
Vested at end of period aggregate intrinsic value	18,911,451		18,911,451
Vested and expected to vest, aggregate intrinsic value	31,649,823		31,649,823
Exercised options, intrinsic value	7,182,000
Exercise Price Range, lower range limit (in dollars per share)																						$ 0.50	$ 0.87	$ 1.40	$ 2.33	$ 3.95	$ 6.11
Exercise Price Range, upper range limit (in dollars per share)																						$ 0.76	$ 1.35	$ 2.29	$ 3.75	$ 6.02	$ 6.75
Number of outstanding options (in shares)	15,139,543		15,139,543																			1,340,935	6,656,908	1,686,700	2,159,500	3,035,000	260,500
Outstanding Options, weighted average remaining contractual term	7 years 10 months 24 days		7 years 10 months 24 days																			3 years 10 months 24 days	7 years 10 months 24 days	6 years 4 months 24 days	9 years	9 years 6 months	9 years 8 months 12 days
Outstanding Options, weighted average exercise price (in dollars per share)	$ 2.28		$ 2.28																			$ 0.65	$ 1.20	$ 1.62	$ 2.75	$ 5.07	$ 6.49
Number of exercisable options (in shares)	6,482,824		6,482,824																			1,340,935	3,336,870	1,436,698	368,321	0	0
Exercisable Options, weighted average exercise price (in dollars per share)	$ 1.25		$ 1.25																			$ 0.65	$ 1.19	$ 1.65	$ 2.52	$ 0.00	$ 0.00
Fair value options valuation assumptions [Abstract]
Expected volatility (in hundredths)																												64.56%	64.30%	61.41%	45.75%
Expected life				6 years																								6 years		5 years 6 months
Expected dividend yield (in hundredths)			0.00%	0.00%
Risk-free interest rate, minimum (in hundredths)			0.85%	0.62%
Risk-free interest rate, maximum (in hundredths)			1.88%	1.62%
Share-based Compensation [Abstract]
Share-based compensation expense	$ 1,667,766	$ 669,469	$ 4,155,005	$ 1,755,669						$ 75,287	$ 11,643	$ 198,119	$ 65,132	$ 110,694	$ 70,754	$ 309,461	$ 217,885	$ 1,481,785	$ 587,072	$ 3,647,425	$ 1,472,652
Weighted-average grant date fair value for options granted during the period (in dollars per share)	$ 3.00
Warrants, term	5 years
Warrants, Number of Warrants [Roll Forward]
Warrants outstanding, beginning of period (in shares)					1,923,669	3,129,168
Warrants exercised (in shares)							(62,500)	(266,666)	(876,333)
Warrants outstanding, end of period (in shares)					1,923,669	3,129,168
Warrants, Weighted-Average Exercise Price per Warrant [Roll Forward]
Warrants outstanding, beginning of period (in dollars per share)					0.93	1.04
Warrants exercised (in dollars per share)							0.01	1.50	1.23
Warrants outstanding, end of period (in dollars per share)					0.93	1.04