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SHARE-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [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, 2020.
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 |
2008 Plan |  |  | 200,000 |  |  |  | immediately upon granting to six years |  | $12.35~$21.20 |  |  | — |
2009 Plan |  |  | 500,000 |  | (4) |  | immediately upon granting to four years |  | $4.775~$12.35 |  |  | — |
2010 Plan |  |  | 440,000 |  | (5) |  | three years |  | $4.0505~$5.7 |  |  | — |
(1) | The granted awards, net of forfeited or canceled options, were within reserved shares of 1,400 thousand common shares.
(2) | The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 200 thousand common shares.
(3) | The granted awards, net of forfeited or canceled options or shares, were within reserved shares of 400 thousand common shares.
(4) | The granted awards, net of forfeited or canceled options, were within reserved shares of 300 thousand common shares.
(5) | The granted awards, net of forfeited or canceled options, were within reserved shares of 200 thousand common shares.
Summary of Option Transactions | Option transactions during the last three years are summarized as follows:
|  | 2018 |  |  | 2019 |  |  | 2020 |
|  | Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |  |  | Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |  |  | Weighted Avg. Exercise Price |  |  | No. of Shares (in thousands) |  |  | Weighted- Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value (in thousands) |
Balance at January 1 |  | $ | 14.78 |  |  |  | 308 |  |  | $ | 10.88 |  |  |  | 229 |  |  | $ | 11.00 |  |  |  | 225 |  |  |  |  |  |  |  |  |
Options granted |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Options Forfeited / canceled / expired |  |  | 26.08 |  |  |  | (79 | ) |  |  | 3.85 |  |  |  | (4 | ) |  |  | 12.35 |  |  |  | (176 | ) |  |  |  |  |  |  |  |
Balance at December 31 |  | $ | 10.88 |  |  |  | 229 |  |  | $ | 11.00 |  |  |  | 225 |  |  | $ | 6.16 |  |  |  | 49 |  |  |  | 2.58 |  |  | $ | 1 |
Exercisable at December 31 |  | $ | 10.97 |  |  |  | 227 |  |  | $ | 11.05 |  |  |  | 224 |  |  | $ | 6.16 |  |  |  | 49 |  |  |  | 2.58 |  |  | $ | 1 |
Vested and expected to vest at December 31 |  | $ | 10.88 |  |  |  | 229 |  |  | $ | 11.00 |  |  |  | 225 |  |  | $ | 6.16 |  |  |  | 49 |  |  |  | 2.58 |  |  | $ | 1 |
Information about Stock Options Outstanding | The following table sets forth information about stock options outstanding at December 31, 2020:
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 |  |  | 8 |  |  | 3.68 years |  | Under $5 |  |  | 8 |
$5~$50 |  |  | 41 |  |  | 2.36 years |  | $5~$50 |  |  | 41 |
$50~$100 |  |  | — |  |  |  |  | $50~$100 |  |  | — |
|  |  | 49 |  |  |  |  |  |  |  | 49 |

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