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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Stock Option Activity | A summary of the Company’s outstanding stock option activity for the years ended December 31, 2018 and 2017 is as follows:
|  |  |  |  | December 31, 2018 |  |  |  |
|  |  |  |  | Weighted- Average |  |  | Weighted- Average Remaining Contractual Life |  |  |  |
|  | Options |  |  | Exercise Price |  |  | (Years) |  |  | Intrinsic Value |
Outstanding at December 31, 2017 |  |  | 11,302 |  |  | $ | 264.26 |  |  |  | 7.3 |  |  | $ | - |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expired |  |  | (1 | ) |  | $ | 7,423.20 |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2018 |  |  | 11,301 |  |  | $ | 263.85 |  |  |  | 6.3 |  |  | $ | - |
Exercisable at December 31, 2018 |  |  | 10,636 |  |  | $ | 261.61 |  |  |  | 7.1 |  |  | $ | - |
Vested and expected to vest at December 31, 2018 |  |  | 11,301 |  |  | $ | 263.85 |  |  |  | 6.3 |  |  | $ | - |
|  |  |  |  | December 31, 2017 |  |  |  |
|  |  |  |  | Weighted- Average |  |  | Weighted- Average Remaining Contractual Life |  |  |  |
|  | Options |  |  | Exercise Price |  |  | (Years) |  |  | Intrinsic Value |
Outstanding at December 31, 2016 |  |  | 11,446 |  |  | $ | 367.08 |  |  |  | 8.2 |  |  | $ | - |
Granted |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Expired |  |  | (144 | ) |  | $ | 8,719.64 |  |  |  | - |  |  |  | - |
Outstanding at December 31, 2017 |  |  | 11,302 |  |  | $ | 264.26 |  |  |  | 7.3 |  |  | $ | - |
Exercisable at December 31, 2017 |  |  | 9,835 |  |  | $ | 287.31 |  |  |  | 8.3 |  |  | $ | - |
Vested and expected to vest at December 31, 2017 |  |  | 11,302 |  |  | $ | 264.26 |  |  |  | 7.3 |  |  | $ | - |
Summary of Stock-Based Compensation Expense | Total stock-based compensation expense included in the consolidated statements of operations is allocated as follows (in thousands):
|  | As of December 31, |
|  | 2018 |  |  | 2017 |
Cost of revenue |  | $ | - |  |  | $ | 10 |
Research and development |  |  | 1 |  |  |  | 64 |
General and administrative |  |  | 22 |  |  |  | 92 |
Selling and marketing |  |  | 19 |  |  |  | 53 |
|  | $ | 42 |  |  | $ | 219 |

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