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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summary of General Terms of Stock-Based Compensation Plans for Awards Granted | Summarized below are the general terms of our stock-based compensation plans, for which awards have been granted as of December 31, 2023.
Stock-Based compensation plan |  | Granted awards |  |  |  | Vesting schedule |  | Options’ exercise price |  | RSUs’ grant date fair value |
2004 plan |  |  | 1,575,037 |  | (1) |  | immediately upon granting to four years |  | $3.95~$12.75 |  |  | — |
2006 Plan |  |  | 256,716 |  | (2) |  | immediately upon granting to four years |  | $3.85~$83 |  | $14.55~$80.05 |
2007 Plan |  |  | 675,057 |  | (3) |  | immediately upon granting to four years |  | $2.90~$90.85 |  | $12.35~$76.75 |
(1) The granted awards, net of forfeited or canceled options, were within reserved shares of 1,400 thousand ordinary shares. (2) The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 200 thousand ordinary shares. (3) The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 400 thousand ordinary shares.
Summary of Option Transactions | Option transactions during the last three years are summarized as follows:
| 2023 |  |  | 2022 |  | 2021 |
| Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (in thousands) |  |  | Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |  |  |  | Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |
Balance at January 1 | $ | 6.38 |  |  |  | 33 |  |  |  |  |  |  |  |  | $ | 6.13 |  |  |  | 37 |  |  |  | $ | 6.16 |  |  |  | 49 |
Options granted |  | — |  |  |  | — |  |  |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |
Options exercised |  | — |  |  |  | — |  |  |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  | — |  |  |  | — |
Options Forfeited / canceled / expired |  | 5.05 |  |  |  | (4 | ) |  |  |  |  |  |  |  |  | 4.05 |  |  |  | (4 | ) |  |  |  | 6.25 |  |  |  | (12 | )
Balance at December 31 | $ | 6.56 |  |  |  | 29 |  |  |  | 0.67 |  |  | $ | — |  |  | $ | 6.38 |  |  |  | 33 |  |  |  | $ | 6.13 |  |  |  | 37 |
Exercisable at December 31 | $ | 6.56 |  |  |  | 29 |  |  |  | 0.67 |  |  | $ | — |  |  | $ | 6.38 |  |  |  | 33 |  |  |  | $ | 6.13 |  |  |  | 37 |
Vested and expected to vest at December 31 | $ | 6.56 |  |  |  | 29 |  |  |  | 0.67 |  |  | $ | — |  |  | $ | 6.38 |  |  |  | 33 |  |  |  | $ | 6.13 |  |  |  | 37 |
Information about Stock Options Outstanding | The following table sets forth information about stock options outstanding at December 31, 2023:
Options outstanding |  | Option currently exercisable |
Exercise price |  | No. of Shares (in thousands) |  |  | Weighted average remaining contractual life |  | Exercise price |  | No. of Shares (in thousands) |
Under $5 |  |  | 4 |  |  | 3.35 years |  | Under $5 |  |  | 4 |
$5~$50 |  |  | 25 |  |  | 0.24 years |  | $5~$50 |  |  | 25 |
$50~$100 |  |  | — |  |  |  |  | $50~$100 |  |  | — |
|  |  | 29 |  |  |  |  |  |  |  | 29 |

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