Long-term Debt	9 Months Ended
Sep. 30, 2012
Long-term Debt [Abstract]
Long-term Debt	6. Long-term Debt On September 9, 2011 we entered into a Second Amendment to the Amended and Restated Loan and Security Agreement (loan agreement) with General Electric Capital Corporation (GECC), Silicon Valley Bank (SVB) and Oxford Finance Corporation (together, the "Lenders"), pursuant to which the Lenders increased the prior term loan made to the Company to a principal amount of $25.0 million (Term Loan), subject to the terms and conditions set forth in the loan agreement. The Term Loan accrues interest at a fixed rate of 9.87% per annum. Pursuant to the loan agreement, we are required to make (i) twelve (12) equal consecutive monthly principal payments of $20,833 on the first day of each calendar month, commencing on October 1, 2011, (ii) twenty-nine (29) equal consecutive monthly principal payments of $825,000 on the first day of each calendar month, commencing on October 1, 2012, and (iii) and one (1) final principal payment of $825,000 on March 1, 2015. In addition, the maturity date of the Term Loan has been extended until March 1, 2015, and at maturity of the Term Loan, the Company will make a final payment fee equal to 5% ($1,250,000) of the Term Loan. We may incur additional fees if we elect to prepay the Term Loan. In connection with the Term Loan, on September 9, 2011, we issued to the Lenders warrants to purchase up to an aggregate of 132,891 shares of our common stock at an exercise price of $3.01 per share. These warrants are immediately exercisable and will expire on September 9, 2018. The Term Loan amended the Amended and Restated Loan and Security Agreement, of which an aggregate balance of approximately $15.6 million remained outstanding along with a prorated final payment fee of $419,000. The net proceeds of the Term Loan, after payment of lender fees and expenses, were approximately $8.6 million. We accounted for this amendment as debt modification since the terms of the amended Term Loan and the Original Term Loan were not substantially different and as present value of cash flows of the modified instrument (using a net method of comparing the present value of cash flows related to the lowest common principal balance between the old and the new loans) was within 10% of the original debt instrument. Accordingly, the fees associated with the amended Term Loan of $300,000, final payment fee of $1,250,000, and the existing unamortized debt discount from the Original Term Loan of $332,000 will be amortized as an adjustment of interest expense over the term of the Amended Term Loan using the effective interest method. We allocated the aggregate proceeds of the Term Loan between the warrants and the debt obligations based on their relative fair values. The fair value of the warrants issued to the Lenders is calculated utilizing the Black-Scholes option-pricing model. We are amortizing the relative fair value of the warrants as a discount of $267,000 over the term of the loan using the effective interest method, with an effective interest rate of 13.63%. If the maturity of the debt is accelerated due to an event of default, then the amortization would be accelerated. The Term Loan is collateralized by the tangible assets of the company, including a security interest in substantially all of its existing and after-acquired assets, excluding its intellectual property assets; provided however, that if the Company does not maintain certain cash ratios, the security interest automatically will be deemed to include the Company's intellectual property assets. As of September 30, 2012, we were in compliance with our financial and non-financial covenants.

6. Long-term Debt

On September 9, 2011 we entered into a Second Amendment to the Amended and Restated Loan and Security Agreement (loan agreement) with General Electric Capital Corporation (GECC), Silicon Valley Bank (SVB) and Oxford Finance Corporation (together, the "Lenders"), pursuant to which the Lenders increased the prior term loan made to the Company to a principal amount of $25.0 million (Term Loan), subject to the terms and conditions set forth in the loan agreement. The Term Loan accrues interest at a fixed rate of 9.87% per annum. Pursuant to the loan agreement, we are required to make (i) twelve (12) equal consecutive monthly principal payments of $20,833 on the first day of each calendar month, commencing on October 1, 2011, (ii) twenty-nine (29) equal consecutive monthly principal payments of $825,000 on the first day of each calendar month, commencing on October 1, 2012, and (iii) and one (1) final principal payment of $825,000 on March 1, 2015. In addition, the maturity date of the Term Loan has been extended until March 1, 2015, and at maturity of the Term Loan, the Company will make a final payment fee equal to 5% ($1,250,000) of the Term Loan. We may incur additional fees if we elect to prepay the Term Loan. In connection with the Term Loan, on September 9, 2011, we issued to the Lenders warrants to purchase up to an aggregate of 132,891 shares of our common stock at an exercise price of $3.01 per share. These warrants are immediately exercisable and will expire on September 9, 2018.

The Term Loan amended the Amended and Restated Loan and Security Agreement, of which an aggregate balance of approximately $15.6 million remained outstanding along with a prorated final payment fee of $419,000. The net proceeds of the Term Loan, after payment of lender fees and expenses, were approximately $8.6 million.

We accounted for this amendment as debt modification since the terms of the amended Term Loan and the Original Term Loan were not substantially different and as present value of cash flows of the modified instrument (using a net method of comparing the present value of cash flows related to the lowest common principal balance between the old and the new loans) was within 10% of the original debt instrument. Accordingly, the fees associated with the amended Term Loan of $300,000, final payment fee of $1,250,000, and the existing unamortized debt discount from the Original Term Loan of $332,000 will be amortized as an adjustment of interest expense over the term of the Amended Term Loan using the effective interest method.

We allocated the aggregate proceeds of the Term Loan between the warrants and the debt obligations based on their relative fair values. The fair value of the warrants issued to the Lenders is calculated utilizing the Black-Scholes option-pricing model. We are amortizing the relative fair value of the warrants as a discount of $267,000 over the term of the loan using the effective interest method, with an effective interest rate of 13.63%. If the maturity of the debt is accelerated due to an event of default, then the amortization would be accelerated. The Term Loan is collateralized by the tangible assets of the company, including a security interest in substantially all of its existing and after-acquired assets, excluding its intellectual property assets; provided however, that if the Company does not maintain certain cash ratios, the security interest automatically will be deemed to include the Company's intellectual property assets. As of September 30, 2012, we were in compliance with our financial and non-financial covenants.