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Convertible Debt (Details) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |  | 2 Months Ended |
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Nov. 19, 2010 | Nov. 04, 2010 | Sep. 23, 2010 | Sep. 25, 2010 | Mar. 21, 2010 | Apr. 30, 2011 | Mar. 31, 2011 | Nov. 30, 2010 | Oct. 31, 2010 | Sep. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 16, 2012 | Apr. 25, 2011 | Sep. 22, 2010 | Sep. 08, 2010 | May 27, 2010 | Mar. 27, 2010 | Sep. 30, 2010 Senior Convertible Secured Notes - 2007 [Member] Debt_holder | Dec. 31, 2012 Senior Convertible Secured Notes - 2007 [Member] | Dec. 31, 2011 Senior Convertible Secured Notes - 2007 [Member] | Dec. 31, 2010 Senior Convertible Secured Notes - 2007 [Member] | Sep. 22, 2010 Senior Convertible Secured Notes - 2007 [Member] | Jun. 30, 2011 September 2009 Senior Convertible Secured Notes Financing transaction [Member] | Dec. 15, 2009 September 2009 Senior Convertible Secured Notes Financing transaction [Member] | Dec. 31, 2012 September 2009 Senior Convertible Secured Notes Financing transaction [Member] | Dec. 31, 2011 September 2009 Senior Convertible Secured Notes Financing transaction [Member] | Dec. 31, 2010 September 2009 Senior Convertible Secured Notes Financing transaction [Member] | Jun. 30, 2010 Senior Convertible Secured Notes - 2010 [Member] | Dec. 31, 2012 Senior Convertible Secured Notes - 2010 [Member] | Dec. 31, 2011 Senior Convertible Secured Notes - 2010 [Member] | Dec. 31, 2010 Senior Convertible Secured Notes - 2010 [Member] | Dec. 31, 2011 Senior Convertible Secured Notes- 2011 [Member] | Nov. 30, 2011 Senior Convertible Secured Notes- 2011 [Member] | Apr. 30, 2011 Senior Convertible Secured Notes- 2011 [Member] | Dec. 31, 2012 Senior Convertible Secured Notes- 2011 [Member] | Dec. 31, 2011 Senior Convertible Secured Notes- 2011 [Member] | Dec. 13, 2011 Senior Convertible Secured Notes- 2011 [Member] | Jun. 30, 2011 Senior Convertible Secured Notes- 2011 [Member] | Mar. 31, 2011 Senior Convertible Secured Notes- 2011 [Member] | Oct. 31, 2010 Warrant Repricing and Debt Extension Financing Transaction - 2010 [Member] | Dec. 13, 2010 Warrant Repricing and Debt Extension Financing Transaction - 2010 [Member]
Convertible Debt (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,000 | $ 12,500 | $ 1,600 | $ 1,600 |  | $ 0 | $ 0 | $ 0 | $ 126,362 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory notes, interest rate description |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Greater of 8% or LIBOR plus 3% interest per annum. | Greater of 8% or LIBOR plus 3% interest per annum. |  |  |  |  | Annual interest rate of 7%, payable on June 30 and December 31 of each year. |  |  |  | Annual interest rate of 7%, payable on June 30 and December 31 of each year. |  |  |  |  |  | Interest at a rate of seven percent (7%) per annum, that was scheduled to mature on March 1, 2014 |  |  |  |  |  |
Maturity date of convertible notes |  |  |  |  |  |  |  |  |  | Aug. 26, 2010 |  |  |  |  |  |  |  |  |  |  | Aug. 26, 2010 | Aug. 26, 2010 |  |  |  |  | Dec. 31, 2010 | Dec. 31, 2010 |  |  |  | Dec. 31, 2010 |  |  |  |  | Mar. 01, 2014 |  |  |  |  |  | Dec. 31, 2010 |
Proceeds from Issuance of Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 987,000 |  |  |  | 1,597,000 |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |
Extended maturity date of convertible promissory notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Apr. 26, 2011 |  |  |  |  | Jun. 30, 2011 | Jun. 30, 2011 |  |  |  | Jun. 30, 2011 |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2011 |
Number of debt holders under debt modification agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt-for-equity repayment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Retired the convertible promissory notes in equal installments by issuing our common stock priced at a 15% discount from the average market closing price for the five days ending on the 25th of each month over the eight month period beginning September 26, 2010 ending on April 26, 2011. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Right of holder under debt-for-equity repayment plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Right to convert the outstanding balance priced at $2.25 per share if the market value of our common stock was greater than $2.50 per share for five consecutive days. |  |  |  |  |  | Right to have the conversion price adjusted to equal the lower stock price if we issued common stock or convertible notes at a lower conversion price than $0.50 per share during the period that the notes were outstanding. |  |  |  | Right to have the conversion price adjusted to equal the lower stock price if we issued stock or convertible notes at a lower conversion price than $0.50 during the period that the notes were outstanding. |  |  |  |  |  |  |  |  |  |  |  |
Stock issued to holders of notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,570 |  |  |  |  |  | 1,851,486 |  |  |  | 3,557,171 |  |  |  |  |  |  |  |  |  |  |
Shares issued on conversion of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,513,237 | 232,125 | 1,691,320 |  |  |  |  |  |  |
Principal amount of convertible notes converted into shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 912,036 |  |  |  | 1,750,143 |  | 3,700,000 |  |  |  |  |  |  |  |  |
Accrued interest on convertible notes converted into shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,707 |  |  |  | 28,442 |  | 130,000 |  |  |  |  |  |  |  |  |
Payment of convertible debt in cash |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity, principal payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 84,657 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity interest payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  | $ 0.50 | $ 0.50 |  | $ 87.50 | $ 87.50 |  |  |  | $ 0.50 | $ 0.50 |  |  |  |  |  |  |  |  |  | $ 2.5 |  | $ 2.50 |  |  |  |
Interest rate payable on notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Issued |  |  |  |  |  |  |  |  |  |  |  | 361,000 |  |  | 200,000 | 50,000 |  |  |  |  |  |  |  |  |  |  |  | 986,983 |  |  | 1,760,712 |  |  |  | 422,830 |  |  |  | 422,830 |  |  | 373,730 |  |
Period of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Warrants, exercise price |  |  | $ 1.00 | $ 1.00 | $ 1.00 | $ 1.00 | $ 3.13 |  |  | $ 1.00 | $ 1.00 |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  |  | $ 1.00 |  |  |  |  |  |  |  | $ 3.13 |  |  |  | $ 1.00 |
Period from which Warrants Exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Beginning on the six-month anniversary of the date of issuance until the warrant expiration date. |  |  |  | Beginning on the six-month anniversary date of issuance until the warrant expiration date. |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  | 8,700,000 |  | 6,700,000 |  | 4,800,000 |  | 6,700,000 |  |  |  |  |
Loss on embedded derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  | 4,400,000 |  |  |  |  |  | 1,900,000 |  |  |  |  |
Fair value of embedded derivative liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  | 0 |  |  |  | 0 |  |  |  |  |
Converted accounts payable related to private placement of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Notes would automatically converted into common stock on or before due date when |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The notes were automatically convertible into shares of the Company's common stock in the event that on or before the note due date either (a) the Company's common stock was traded at a price per share of $6.25 or higher for five (5) consecutive trading days, or (b) the Company consummated a financing in the amount of at least $5 million. |  |  |  |  |  |
Investor receives number of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Equal to twenty-five percent (25%) of the investor's note to the Company. |  |  |  | Equal to twenty-five percent (25%) of the investor's note to the Company. |  |  |  |  |
Proceeds from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  | 223,000 | 515,000 | 49,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 |
Interest expense on debt |  |  | 24,000 | 52,000 |  |  |  |  |  | 24,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000 | 62,000 |  |  | 28,000 | 109,000 |  |  | 1,500,000 |  | 232,000 |  |  |  |  |
Value of warrants on relative fair value basis using Black-Scholes option pricing model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 937,000 |  |  |  |  |  |  |
Accrued Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,628,000 |  |  |  | 69,628,000 |  | 69,628 |  |  |
Accrued Interest Paid To Note Holders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,277,000 |  |  |  | 10,277,000 |  | 10,277 |  |  |
Notes converted to common stock, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 575,000 |  |  |  |  |  |  |  |
Notes converted, original debt, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,200,000 |  |  |  |  |  |  |  |
Proceeds from public offering pursuant to registration statement on form S-3 (in excess) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Bonus interest feature common stock issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,461 |  |  |  | 99,461 | 99,461 |  |  |  |
Discounted warrant exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.88 |
Shares issued on warrant exercise | 390,672 | 792,086 |  |  |  |  |  | 792,086 | 1,235,636 | 348,464 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,766,857 |
Shares issued of unregistered common stock to note holders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27,851 |  |  |  | 27,851 |  |  |  |  |
Warrant exercise price on replacement of previously issued warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.38 |
Warrants revalued on replacement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,335,785
Fair value of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 397,845 |  |  |  |  |  |  |  |  |
Convertible debt outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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- Definition The specified number of securities that each class of warrants or rights outstanding give the holder the right but not the obligation to purchase from the issuer at a specific price, on or before a certain date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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