|
Stock Option Plan (Details Textual) (USD $)
|
3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Feb. 29, 2012
Stock Options [Member]
|
Jun. 30, 2013
Stock Options [Member]
|
Dec. 31, 2012
Stock Options [Member]
|
Dec. 31, 2011
Stock Options [Member]
|
Dec. 31, 2010
Stock Options [Member]
|
Dec. 31, 2009
Stock Options [Member]
|
Dec. 31, 2008
Stock Options [Member]
|
Dec. 31, 2007
Stock Options [Member]
|
Dec. 31, 2006
Stock Options [Member]
|
Dec. 31, 2012
Minimum [Member]
Stock Options [Member]
|
Dec. 31, 2010
Minimum [Member]
Stock Options [Member]
|
Dec. 31, 2008
Minimum [Member]
Stock Options [Member]
|
Dec. 31, 2007
Minimum [Member]
Stock Options [Member]
|
Dec. 31, 2006
Minimum [Member]
Stock Options [Member]
|
Dec. 31, 2012
Maximum [Member]
Stock Options [Member]
|
Dec. 31, 2010
Maximum [Member]
Stock Options [Member]
|
Dec. 31, 2008
Maximum [Member]
Stock Options [Member]
|
Dec. 31, 2007
Maximum [Member]
Stock Options [Member]
|
Dec. 31, 2006
Maximum [Member]
Stock Options [Member]
|
Dec. 31, 2012
2003 Stock Plan [Member]
|
Dec. 31, 2012
2003 Stock Plan [Member]
Minimum [Member]
|
Dec. 31, 2012
2003 Stock Plan [Member]
Maximum [Member]
|
Dec. 31, 2012
2012 Employee Stock Option Plan [Member]
|
|
| 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 | 1,086,848 | 1,998,435 | 14,528 | ||||||||||||||||||||||||
| Recorded option expense | $ 94,200 | $ 40,410 | $ 188,400 | $ 240,400 | $ 266,172 | $ 19,935 | |||||||||||||||||||||