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Summary of Significant Accounting Policies (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Inventories | Inventories are comprised of implantable tissue, nerve grafts, Avance® Nerve Graft, AxoGuard® Nerve Connector, AxoGuard® Nerve Protector, and supplies that are valued at the lower of cost (first-in, first-out) or market and consist of the following:
|  | March 31, 2013 |  |  | December 31, 2012 |
|  | (unaudited) |  |  |  |
Finished goods |  | $ | 2,246,213 |  |  | $ | 2,143,176 |
Work in process |  |  | 149,561 |  |  |  | 145,156 |
Raw materials |  |  | 1,024,479 |  |  |  | 862,777 |
|  | $ | 3,420,253 |  |  | $ | 3,151,109 |
| Inventories are comprised of implantable tissue, nerve grafts, AxoGuard® Nerve Connector, AxoGuard® Nerve Protector, and supplies that are valued at the lower of cost (first-in, first-out) or market and consist of the following:
|  | December 31, 2012 |  |  | December 31, 2011 |
Finished goods |  | $ | 2,143,176 |  |  | $ | 1,374,817 |
Work in process |  |  | 145,156 |  |  |  | 145,300 |
Raw materials |  |  | 862,777 |  |  |  | 240,423 |
|  | $ | 3,151,109 |  |  | $ | 1,760,540 |
Depreciation and amortization estimated useful life |  | Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets as follows:
Furniture and equipment |  | 2-5 years
Leasehold improvements |  | 5 years (or lease term if less)
Processing equipment |  | 5-7 years
Stock-Based Compensation | The Company used the following weighted-average assumptions for options granted during the three months ended March 31:
Three months ended March 31, |  | 2013 |  |  | 2012 |
Expected term (in years) |  |  | 4.0 |  |  |  | 4.0 |
Expected volatility |  |  | 84.90 | % |  |  | 118.17 | %
Risk free rate |  |  | 0.56 | % |  |  | 0.62 | %
Expected dividends |  |  | 0.0 | % |  |  | 0.0 | %
| The Company used the following weighted-average assumptions for options granted during the year ended December 31:
Years ended December 31, |  | 2012 |  |  | 2011 |
Expected term (in years) |  |  | 4.0 |  |  |  | 4.0 |
Expected volatility |  |  | 117.2 | % |  |  | 90.9 | %
Risk free rate |  |  | 0.61 | % |  |  | 1.27 | %
Expected dividends |  |  | 0.0 | % |  |  | 0.0 | %
Summary of basic loss attributable to common shareholders |  | The basic loss attributable to common stockholders was computed as follows:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |
Net loss |  | $ | (9,417,958 | ) |  | $ | (9,219,220 | )
Less preferred dividends |  |  | (— | ) |  |  | (1,028,351 | )
Net loss attributable to common stockholders |  | $ | (9,417,958 | ) |  | $ | (10,247,571 | )

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