Stock Option Plan (Details Textual) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | ||||||||||||||||||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Feb. 29, 2012
Stock Options [Member]
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Sep. 30, 2013
Stock Options [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Dec. 31, 2010
Stock Options [Member]
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Dec. 31, 2009
Stock Options [Member]
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Dec. 31, 2008
Stock Options [Member]
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Dec. 31, 2007
Stock Options [Member]
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Dec. 31, 2006
Stock Options [Member]
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Dec. 31, 2012
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2010
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2008
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2007
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2006
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2012
Maximum [Member]
Stock Options [Member]
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Dec. 31, 2010
Maximum [Member]
Stock Options [Member]
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Dec. 31, 2008
Maximum [Member]
Stock Options [Member]
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Dec. 31, 2007
Maximum [Member]
Stock Options [Member]
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Dec. 31, 2006
Maximum [Member]
Stock Options [Member]
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Dec. 31, 2012
2003 Stock Plan [Member]
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Dec. 31, 2012
2003 Stock Plan [Member]
Minimum [Member]
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Dec. 31, 2012
2003 Stock Plan [Member]
Maximum [Member]
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Dec. 31, 2012
2012 Employee Stock Option Plan [Member]
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Stock Option Plan (Textual) | |||||||||||||||||||||||||||
Maximum granted option to purchase common stock | 757,575 | ||||||||||||||||||||||||||
Maximum granted option after amendment in 2008 | 978,154 | ||||||||||||||||||||||||||
Share based payment award vesting period | 4 years | 4 years | 4 years | 4 years | 4 years | 5 years | 5 years | 5 years | 5 years | 4 years | 5 years | ||||||||||||||||
Share based payment award monthly vesting percentage | 2.00% | ||||||||||||||||||||||||||
Percentage of aggregate issued and outstanding common shares reserved under offering | 15.00% | ||||||||||||||||||||||||||
Stock reserved for future issuance under ESOP | 9,455,776 | ||||||||||||||||||||||||||
Increment in number of shares under plan | 3,217,880 | ||||||||||||||||||||||||||
Total shares reserved for issuance under plan | 6,155,280 | ||||||||||||||||||||||||||
Stock option granted to employees to purchase common stock | 2,056,275 | 33,300 | 69,941 | 113,220 | 206,060 | ||||||||||||||||||||||
Stock option granted to purchase common stock, exercise price | $ 0.90 | $ 0.90 | $ 1.35 | $ 1.35 | $ 0.78 | $ 1.5 | |||||||||||||||||||||
Stock option granted to purchase common stock, term | 10 years | 10 years | 10 years | 10 years | 10 years | ||||||||||||||||||||||
Fair value of stock option | $ 1,519,777 | $ 24,996 | $ 44,159 | $ 137,652 | $ 1,051,281 | ||||||||||||||||||||||
Discount rate | 1.80% | 2.16% | 3.46% | 3.46% | 4.29% | ||||||||||||||||||||||
Expected life | 7 years | 5 years | 5 years | 5 years | 5 years | ||||||||||||||||||||||
Expected volatility | 171.00% | 139.00% | 143.00% | 156.00% | 160.44% | 161.49% | |||||||||||||||||||||
Expected dividends | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | ||||||||||||||||||||||
Stock option cancelled during period | 20,613 | ||||||||||||||||||||||||||
Stock option forfeitures during period | (49,950) | 128,050 | |||||||||||||||||||||||||
Employee stock option units repriced | 273,859 | ||||||||||||||||||||||||||
Outstanding stock option exercise price after repricing of stock option | $ 1.28 | ||||||||||||||||||||||||||
Share based compensation cost after repricing of stock options | 34,879 | ||||||||||||||||||||||||||
Unrecognized share based compensation expense | 1,014,474 | 1,998,435 | 14,528 | ||||||||||||||||||||||||
Recorded option expense | $ 95,971 | $ 72,100 | $ 188,400 | $ 240,400 | $ 266,172 | $ 19,935 |