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Stock Option Plan (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(v) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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