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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Company's Stock Option Activity | Following is a summary of the Company’s stock option activity for the three years ended December 31, 2020:
|  | Number of Options |  |  | Weighted Average Exercise Price |
Outstanding at December 31, 2017 |  |  | 674,000 |  |  | $ | 3.43 |
Granted |  |  | 495,000 |  |  |  | 6.72 |
Exercised |  |  | (52,000 | ) |  |  | 2.08 |
Cancelled / forfeited |  |  | (6,000 | ) |  |  | 3.20 |
Outstanding at December 31, 2018 |  |  | 1,111,000 |  |  |  | 4.95 |
Granted |  |  | 683,000 |  |  |  | 6.48 |
Exercised |  |  | (6,000 | ) |  |  | 1.18 |
Cancelled / forfeited |  |  | (67,000 | ) |  |  | 6.35 |
Outstanding at December 31, 2019 |  |  | 1,721,000 |  |  |  | 5.52 |
Granted |  |  | 800,000 |  |  |  | 15.49 |
Exercised |  |  | (305,000 | ) |  |  | 4.36 |
Cancelled / forfeited |  |  | (207,000 | ) |  |  | 8.04 |
Outstanding at December 31, 2020 |  |  | 2,009,000 |  |  | $ | 9.40 |
Summary of Information Regarding the Company's Outstanding and Exercisable Stock Options | The table below summarizes information regarding the Company’s outstanding and exercisable stock options as of December 31, 2020:
Range of Exercise Prices: |  | Options Outstanding |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |
$0.01 to $4.00 |  |  | 355,000 |  |  |  | 5.2 |  |  | $ | 3.56 |
$4.01 to $8.00 |  |  | 904,000 |  |  |  | 8.0 |  |  |  | 6.65 |
$8.01 to $12.00 |  |  | — |  |  |  | — |  |  |  | — |
$12.01 to $16.00 |  |  | 750,000 |  |  |  | 9.1 |  |  |  | 15.49 |
|  |  | 2,009,000 |  |  |  | 7.9 |  |  | $ | 9.40 |
Range of Exercise Prices: |  | Options Exercisable |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Weighted Average Exercise Price |
$0.01 to $4.00 |  |  | 222,000 |  |  |  | 5.2 |  |  | $ | 3.59 |
$4.01 to $8.00 |  |  | 164,000 |  |  |  | 7.8 |  |  |  | 6.74 |
$8.01 to $12.00 |  |  | — |  |  |  | — |  |  |  | — |
$12.01 to $16.00 |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 386,000 |  |  |  | 6.3 |  |  | $ | 4.93 |
Summary of Assumptions with Respect to the Black-Scholes Option Pricing Model | The Company used the following average assumptions with respect to the Black-Scholes option pricing model for Mastech Digital stock options issued during 2020, 2019 and 2018.
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Stock option grants: |  |  |  |  |  |  |  |  |
Weighted-average risk-free interest rate |  |  | 1.4 | % |  |  | 2.4 | % |  |  | 2.8 | %
Weighted-average dividend yield |  |  | 0.0 | % |  |  | 0.0 | % |  |  | 0.0 | %
Expected volatility |  |  | 52.7 | % |  |  | 49.7 | % |  |  | 50.6 | %
Expected term (in years) |  |  | 3.9 |  |  |  | 5.0 |  |  |  | 5.0 |
Weighted-average fair value |  | $ | 6.36 |  |  | $ | 2.95 |  |  | $ | 3.15 |
Summary of Mastech's Restricted Stock Unit Activity | Following is a summary of Mastech’s restricted stock activity for the three years ended December 31, 2020:
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Beginning outstanding balance |  |  | 33,285 |  |  |  | 34,380 |  |  |  | 30,500 |
Awarded |  |  | 11,475 |  |  |  | 16,365 |  |  |  | 25,380 |
Released |  |  | (13,917 | ) |  |  | (17,460 | ) |  |  | (21,500 | )
Forfeited |  |  | — |  |  |  | — |  |  |  | — |
Ending outstanding balance |  |  | 30,843 |  |  |  | 33,285 |  |  |  | 34,380 |

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