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Earnings (loss) per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Earnings (loss) per Share | Earnings (loss) per Share Basic earnings (loss) per share is computed by dividing net income by the weighted-average number of shares outstanding during the period. Diluted earnings per share is computed by dividing net income by the sum of (1) the weighted-average number of shares of common stock outstanding during the period, and (2) the dilutive effect of assumed conversion of equity awards using the treasury stock method. With respect to the number of weighted-average shares outstanding (denominator), diluted shares reflects: (i) the exercise of options to acquire common stock to the extent that the options’ exercise prices are less than the average market price of common shares during the period and (ii) the pro forma vesting of restricted stock units. The following table sets forth the computations of basic and diluted earnings per share:
| Three months ended September 30, |  | Nine months ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Basic income (loss) per share |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income (loss) attributable to Mistras Group, Inc. | $ | 3,380 |  |  | $ | 1,523 |  |  | $ | 3,955 |  |  | $ | (99,642) |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 29,619 |  |  | 29,177 |  |  | 29,550 |  |  | 29,086 |
Basic income (loss) per share | $ | 0.11 |  |  | $ | 0.05 |  |  | $ | 0.13 |  |  | $ | (3.43) |
Diluted income (loss) per share: |  |  |  |  |  |  |
Numerator: |  |  |  |  |  |  |
Net income (loss) attributable to Mistras Group, Inc. | $ | 3,380 |  |  | $ | 1,523 |  |  | $ | 3,955 |  |  | $ | (99,642) |
Denominator: |  |  |  |  |  |  |
Weighted average common shares outstanding | 29,619 |  |  | 29,177 |  |  | 29,550 |  |  | 29,086 |
Dilutive effect of stock options outstanding | — |  |  | — |  |  | — |  |  | — |
Dilutive effect of restricted stock units outstanding (1) | 508 |  |  | 134 |  |  | 543 |  |  | — |
| 30,127 |  |  | 29,311 |  |  | 30,093 |  |  | 29,086 |
Diluted income (loss) per share | $ | 0.11 |  |  | $ | 0.05 |  |  | $ | 0.13 |  |  | $ | (3.43) |
_______________ (1) For the nine months ended September 30, 2020, 213,000 shares related to restricted stock were excluded from the calculation of diluted EPS due to the net loss for the period.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3630-109257 + Details
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