Equity (Details) (USD $)	3 Months Ended				3 Months Ended
	Mar. 31, 2013 Plan	Mar. 31, 2012	Mar. 31, 2013 Warrants [Member]	Dec. 31, 2012 Warrants [Member]	Mar. 31, 2013 Contingent Warrants Related to Private Placement of Common Stock [Member] Warrants [Member]	Mar. 31, 2013 Callable Warrants [Member] Warrants [Member]	Mar. 31, 2013 Other [Member] Warrants [Member]	Mar. 31, 2013 Cost of Products Sold [Member]	Mar. 31, 2012 Cost of Products Sold [Member]	Mar. 31, 2013 Research and Development [Member]	Mar. 31, 2012 Research and Development [Member]	Mar. 31, 2013 Selling, General and Administrative [Member]	Mar. 31, 2012 Selling, General and Administrative [Member]	Mar. 31, 2013 $0.50-$0.76 [Member]	Mar. 31, 2013 $0.87-$1.35 [Member]	Mar. 31, 2013 $1.40-$2.29 [Member]	Mar. 31, 2013 $2.33-$3.75 [Member]	Mar. 31, 2013 $3.85-$5.80 [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2013 Restricted Stock [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
Additional shares authorized by Board of Directors (in shares)	6,000,000
Shares authorized (in shares)	22,500,000
Number of shares [Roll forward]
Outstanding, beginning of period (in shares)	13,614,135
Granted (in shares)	2,645,000
Exercised (in shares)	(170,099)
Unvested options forfeited (in shares)	(59,667)
Vested options expired (in shares)	(6,666)
Outstanding, end of period (in shares)	16,022,703
Vested at end of period (in shares)	6,853,995
Exercisable options, vested and expected to vest (in shares)	15,641,584
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)	$ 5.04
Exercised, weighted average exercise price (in dollars per share)	$ 1.37
Unvested options forfeited weighted-average exercise price (in dollars per share)	$ 2.32
Vested options expired weighted-average exercise price (in dollars per share)	$ 1.15
Outstanding, weighted average exercise price, end of period (in dollars per share)	$ 2.02
Vested at end of period weighted average exercise price (in dollars per share)	$ 1.11
Vested and expected to vest, weighted average exercise price (in dollars per share)	$ 1.98
Stock options, additional disclosures [Abstract]
Vested at end of period weighted average remaining contractual term	6 years 8 months 12 days
Vested and expected to vest, weighted average remaining contractual term	8 years 1 month 6 days
Vested at end of period aggregate intrinsic value	$ 27,258,080
Vested and expected to vest, aggregate intrinsic value	48,645,480
Exercised options, intrinsic value	613,000
Expenses expected to be recognized over a weighted-average period																			2 years 7 months 6 days	2 years 11 months 5 days
Number of shares granted (in shares)																				250,000
Weighted-average grant date fair value (in dollars per share)																				$ 5.07
Vesting period																				3 years
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock																				1,262,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, lower range limit (in dollars per share)														$ 0.50	$ 0.87	$ 1.40	$ 2.33	$ 3.85
Exercise Price Range, upper range limit (in dollars per share)														$ 0.76	$ 1.35	$ 2.29	$ 3.75	$ 5.80
Number of outstanding options (in shares)	16,022,703													2,319,500	7,002,003	1,851,700	2,179,500	2,670,000
Outstanding Options, weighted average remaining contractual term	8 years 1 month 6 days													5 years 2 months 12 days	8 years 3 months 18 days	6 years 8 months 12 days	9 years 6 months	9 years 10 months 24 days
Outstanding Options, weighted average exercise price (in dollars per share)	$ 2.02													$ 0.67	$ 1.19	$ 1.63	$ 2.75	$ 5.03
Number of exercisable options (in shares)	6,853,995													2,319,500	3,092,797	1,441,698	0	0
Exercisable Options, weighted average exercise price (in dollars per share)	$ 1.11													$ 0.67	$ 1.19	$ 1.66	$ 0	$ 0
Total unrecognized compensation expense	12,961,000
Fair value options valuation assumptions [Abstract]
Expected volatility (in hundredths)	64.30%	58.30%
Expected life	6 years	6 years
Expected dividend yield (in hundredths)	0.00%	0.00%
Risk-free interest rate, minimum (in hundredths)	0.98%
Risk-free interest rate, maximum (in hundredths)	1.86%	0.88%
Weighted-average grant date fair value for options granted during the period (in dollars per share)	$ 2.94
Share-based Compensation [Abstract]
Share-based compensation expense	$ 984,792	$ 500,985						$ 50,162	$ 24,010	$ 75,978	$ 71,520	$ 858,652	$ 405,455
Class of Warrant or Right [Line Items]
Warrants, term	5 years
Warrants, Number of Warrants [Roll Forward]
Warrants outstanding, beginning of period (in shares)			2,344,002	3,129,168
Warrants exercised (in shares)					62,500	266,666	456,000
Warrants outstanding, end of period (in shares)			2,344,002	3,129,168
Warrants, Weighted-Average Exercise Price per Warrant [Roll Forward]
Warrants outstanding, beginning of period (in dollars per share)			1.00	1.04
Warrants exercised (in dollars per share)					$ 0.01	$ 1.50	$ 1.15
Warrants outstanding, end of period (in dollars per share)			1.00	1.04