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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
STOCK-BASED COMPENSATION |
Schedule of stock-based compensation expense | Stock-based compensation expense is included in the consolidated statements of income as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
General and administrative | ​ | $ | 1,698 | ​ | $ | 2,056 | ​ | $ | 3,233
Schedule of stock-based compensation expense included in the consolidated statements of operations by award type | Stock-based compensation expense included in the consolidated statements of income by award type is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
Stock options | ​ | $ | 242 | ​ | $ | — | ​ | $ | 305
RSUs | ​ |  | 1,149 | ​ |  | 1,431 | ​ |  | 1,650
RSAs | ​ |  | 273 | ​ |  | 615 | ​ |  | 1,920
Market-based RSUs (PSUs) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (224)
Market-based RSAs (PSAs) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (464)
ESPP | ​ |  | 34 | ​ |  | 10 | ​ |  | 46
Total stock-based compensation expense | ​ | $ | 1,698 | ​ | $ | 2,056 | ​ | $ | 3,233
Schedule of unrecognized stock-based compensation cost | As of December 31, 2020, the unrecognized stock-based compensation cost and the estimated weighted-average amortization period were as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Unrecognized | ​ | Weighted-Average
​ | ​ | Compensation | ​ | Amortization
(In thousands) |  | Cost |  | Period (Years)
Stock options | ​ | $ | 1,328 | ​ | 3.4
RSUs | ​ | ​ | 351 |  | 0.3
RSAs | ​ |  | 369 |  | 2.4
Total unrecognized compensation cost | ​ | $ | 2,048 | ​ | ​
Summary of equity award activity and related information | The following table summarizes equity award activity under the 2012 Plan and prior plans and related information: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Price of | ​ | Number of | ​ | Fair Value | ​ | Number of | ​ | Fair Value
​ | ​ | outstanding | ​ | Outstanding | ​ | outstanding | ​ | per Share | ​ | outstanding | ​ | per Share
(In thousands, except per share data) |  | options |  | Options |  | RSUs |  | at Grant |  | RSAs |  | at Grant
Balance as of December 31, 2019 | ​ | 1,087 | ​ | $ | 24.18 | ​ | 94 | ​ | $ | 13.94 | ​ | 78 | ​ | $ | 14.46
Granted | ​ | 250 | ​ | ​ | 14.10 | ​ | 85 | ​ | ​ | 13.30 | ​ | 31 | ​ | ​ | 14.30
Exercised | ​ | (30) | ​ | ​ | 12.30 | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | —
Released RSUs/RSAs | ​ | — | ​ | ​ | — | ​ | (94) | ​ | ​ | 13.94 | ​ | (28) | ​ | ​ | 13.92
Forfeited | ​ | (152) | ​ | ​ | 24.43 | ​ | — | ​ | ​ | — | ​ | (51) | ​ | ​ | 14.56
Balance as of December 31, 2020 | ​ | 1,155 | ​ | ​ | 22.28 | ​ | 85 | ​ | ​ | 13.30 | ​ | 30 | ​ | ​ | 14.61
Summary of weighted-average assumptions used to calculate estimated value of stock options | The weighted-average assumptions used in calculating the estimated value of our stock options on the date of grant as follows:
​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ |  | December 31, 2020 |
Risk-free interest rate |  | ​ | 0.4 | %
Expected term (in years) |  | ​ | 6.11 | ​
Volatility |  | ​ | 46.9 | %
Dividend yield |  | ​ | 0 | %
Weighted-average estimated fair value of stock options granted | ​ | $ | 6.28 | ​

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