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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Schedule of Assumptions used in Estimation of Fair Value of the Share-based Payment Awards on the Grant Date |
|  | Year Ended
|  | December 31,
|  | 2020 |  | 2019
Risk-free interest rate |  | 1.6% - 2.5% |  | 1.6% - 2.5%
Volatility |  | 128% - 138.5% |  | 128% - 138.5%
Expected life (years) |  | 3.0 - 5.0 |  | 3.0 - 5.0
Dividend yield |  | 0 % |  | 0 %
Summary of Option and RSU Activity under Amended and Restated 2000 Stock Option and Equity Incentive Plan and Amended and Restated 2010 Equity Incentive Plan | A summary of stock option and restricted stock unit (RSU) award activity under the Plans is presented below (in thousands, except exercise price):
|  |  |  |  |  | Options outstanding |
|  |  |  |  |  |  |  |  |  | Weighted |
|  | Shares |  |  |  |  |  |  | Average |
|  | Available |  |  | Number of |  |  | Exercise |
|  | for Grant |  |  | Shares |  |  | Prices |
Balance as of January 1, 2019 |  |  | 200 |  |  |  | 17 |  |  | $ | 96.24 |
Additional shares authorized under the Plan |  |  | 183 |  |  |  | — |  |  |  | — |
RSUs granted |  |  | (120 | ) |  |  | — |  |  |  | — |
RSUs cancelled and returned to the Plan |  |  | 1 |  |  |  | — |  |  |  | — |
Options granted |  |  | (145 | ) |  |  | 145 |  |  | $ | 2.64 |
Options cancelled and returned to the Plan |  |  | 1 |  |  |  | (1 | ) |  | $ | 144.00 |
Plan termination |  |  | (32 | ) |  |  | — |  |  | $ | — |
Balance as of December 31, 2019 |  |  | 88 |  |  |  | 161 |  |  | $ | 10.85 |
RSUs granted |  |  | (9 | ) |  |  | — |  |  |  | — |
RSUs cancelled and returned to the Plan |  |  | 2 |  |  |  | — |  |  |  | — |
Options cancelled |  |  | — |  |  |  | (2 | ) |  | $ | 4.00 |
Balance as of December 31, 2020 |  |  | 81 |  |  |  | 159 |  |  | $ | 10.82 |
Summary of RSU Activity under the Plans | A summary of RSU activity under the Plans is presented below (in thousands, except fair value):
|  |  |  |  |  | Weighted |
|  |  |  |  |  | Average |
|  | Number of |  |  | Grant-Date |
|  | Shares |  |  | Fair Value |
Non-vested shares as of January 1, 2019 |  |  | 14 |  |  | $ | 24.31 |
Granted |  |  | 120 |  |  | $ | 3.79 |
Vested |  |  | (30 | ) |  | $ | 12.89 |
Cancelled |  |  | (1 | ) |  | $ | 25.13 |
Non-vested shares as of December 31, 2019 |  |  | 103 |  |  | $ | 3.75 |
Granted |  |  | 9 |  |  | $ | 1.74 |
Vested |  |  | (43 | ) |  | $ | 3.72 |
Cancelled |  |  | (4 | ) |  | $ | 4.00 |
Non-vested shares as of December 31, 2020 |  |  | 65 |  |  | $ | 3.48 |
Summary of Significant Ranges of Outstanding and Exercisable Options | The following table summarizes significant ranges of outstanding and exercisable options at December 31, 2020 (in thousands, except contractual life and exercise price):
|  | Options Outstanding |  |  | Options Exercisable |
|  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Average |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Remaining |  |  | Weighted |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Contractual |  |  | Average |  |  |  |  |  |  | Average |  |  | Aggregate |
|  | Number |  |  | Life |  |  | Exercise |  |  | Number |  |  | Exercise |  |  | Intrinsic |
Range of Exercise Price |  | Outstanding |  |  | (in Years) |  |  | Price |  |  | Exercisable |  |  | Price |  |  | value |
$1.57 - $14.99 |  |  | 143 |  |  |  | 8.26 |  |  | $ | 2.62 |  |  |  | 68 |  |  | $ | 2.94 |  |  | $ | 25 |
$15.00 - $25.59 |  |  | 8 |  |  |  | 2.74 |  |  | $ | 15.00 |  |  |  | 8 |  |  | $ | 15.00 |  |  | $ | — |
$25.60 - $143.99 |  |  | 2 |  |  |  | 3.35 |  |  | $ | 41.81 |  |  |  | 2 |  |  | $ | 41.81 |  |  | $ | — |
$144.00 - $409.99 |  |  | 5 |  |  |  | 5.65 |  |  | $ | 144.00 |  |  |  | 5 |  |  | $ | 144.00 |  |  | $ | — |
$410.00 - $924.00 |  |  | 1 |  |  |  | 4.19 |  |  | $ | 430.64 |  |  |  | 1 |  |  | $ | 430.64 |  |  | $ | — |
$1.57 - $924.00 |  |  | 159 |  |  |  | 7.80 |  |  | $ | 10.82 |  |  |  | 84 |  |  | $ | 18.39 |  |  | $ | 25 |

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