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Intangible Assets | 9 Months Ended
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Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Note 6. Intangible Assets Prior to fiscal year 2001, we capitalized certain patent costs, which are being amortized over the estimated life of the patents and would be expensed at the time such patents are deemed to have no continuing value. Since 2001, all patent costs have been expensed as incurred. License costs are capitalized and amortized over the estimated life of the related license agreement. In May 2016, our Board of Directors approved a plan to wind down our current operations, having considered the decision to terminate the Pathway Study, our available strategic alternatives and the current cash position. We are evaluating opportunities to monetize our intellectual property, including data collected in its studies and trade secrets, as well as the transfer of our proprietary HuCNS-SC cells and other assets through a potential sale. As these intellectual properties are no longer in use to further our R&D programs, effective the third quarter of 2016, capitalized costs are no longer being amortized. The components of our intangible assets at September 30, 2016 are summarized below:
Intangible Asset Class |  | Cost |  |  | Accumulated Amortization |  |  | Net Carrying Amount |  |  | Weighted Average Amortization Period |
Patents and licenses |  | $ | 160,436 |  |  | $ | (121,609 | ) |  | $ | 38,827 |  |  |  | 15 years |

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