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Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Stock-based Compensation [Abstract] |
Summary of Stock Option Activity | A summary of OncoCyte stock option activity under the Plan and related information follows (in thousands except weighted average exercise price):
Options |  | Shares Available for Grant |  |  | Number of Options Outstanding |  |  | Weighted Average Exercise Price |
Total at January 1, 2016 |  |  | 1,757 |  |  |  | 2,240 |  |  | $ | 2.03 |
Options granted |  |  | (962 | ) |  |  | 962 |  |  |  | 3.58 |
Options exercised |  |  | - |  |  |  | (100 | ) |  |  | 2.19 |
Options forfeited, cancelled or expired |  |  | 85 |  |  |  | (85 | ) |  |  | 2.00 |
Total at December 31, 2016 |  |  | 880 |  |  |  | 3,017 |  |  |  | 2.52 |
Increase in pool |  |  | 1,200 |  |  |  | - |  |  |  |  |
Options granted |  |  | (896 | ) |  |  | 896 |  |  |  | 5.17 |
Options exercised |  |  | - |  |  |  | (323 | ) |  |  | 1.89 |
Options forfeited, cancelled or expired |  |  | 200 |  |  |  | (200 | ) |  |  | 3.11 |
Total at December 31, 2017 |  |  | 1,384 |  |  |  | 3,390 |  |  | $ | 3.25 |
Exercisable at December 31, 2017 |  |  |  |  |  |  | 1,835 |  |  | $ | 2.48 |
Categories of Stock-based Compensation Expense | OncoCyte recorded stock-based compensation expense in the following categories on the accompanying statements of operations for the years ended December 31, 2017, 2016 and 2015 (in thousands):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Research and development |  | $ | 668 |  |  | $ | 312 |  |  | $ | 456 |
General and administrative |  |  | 841 |  |  |  | 610 |  |  |  | 1,359 |
Sales and marketing |  |  | 121 |  |  |  | - |  |  |  | - |
Total stock-based compensation expense |  | $ | 1,630 |  |  | $ | 922 |  |  | $ | 1,815 |
Assumptions used to Calculate Fair Value of Stock Options | The assumptions that were used to calculate the grant date fair value of OncoCyte’s employee and non-employee stock option grants for the years ended December 31, 2017, 2016 and 2015 were as follows.
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Expected life (in years) |  |  | 6.15 |  |  |  |  | 6.21 |  |  |  |  | 6.83 |  |
Risk-free interest rates |  |  | 2.03 | % |  |  |  | 1.46 | % |  |  |  | 1.87 | % |
Volatility |  |  | 66.01 | % |  |  |  | 64.64 | % |  |  |  | 74.15 | % |
Dividend yield |  |  | - | % |  |  |  | - | % |  |  |  | - | % |

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