XML 41 R31.htm IDEA: XBRL DOCUMENT
v3.23.2

Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of non vested restricted stock unit activity |
Schedule of non vested restricted stock unit activity |  |  |  |  |  |
|  |  |  |  | Weighted Average |
|  | RSUs |  |  | Fair Value (a) |
Outstanding, December 31, 2022 |  |  | 224,288 |  |  | $ | 15.42 |
Granted |  |  | 127,630 |  |  |  | 11.29 |
Vested |  |  | (31,089 | ) |  |  | 17.47 |
Forfeited |  |  | (36,701 | ) |  |  | 15.32 |
Outstanding, June 30, 2023 |  |  | 284,128 |  |  | $ | 11.48 |
(a) | Shares are valued at the grant-date market price.
Schedule of stock option activity |
Schedule of stock option activity |  |  |  |  |  |
|  |  |  |  | Weighted Average |
|  | Options |  |  | Exercise Price |
Outstanding, December 31, 2022 |  |  | 2,379,700 |  |  | $ | 3.31 |
Granted |  |  | 324,000 |  |  |  | 11.08 |
Cancelled |  |  | (373,234 | ) |  |  | 3.29 |
Outstanding, June 30, 2023 |  |  | 2,330,466 |  |  | $ | 4.05 |
Schedule of summarizes information about stock options outstanding |
Schedule of summarizes information about stock options outstanding |  |  |  |  |  |  |  |  |  |
Range of |  | Options |  | Weighted Average |  | Weighted |  | Options |  | Weighted
Exercise |  | Outstanding |  | Remaining |  | Average |  | Exercisable |  | Average
Prices |  | at 6/30/23 |  | Contractual Life |  | Exercise Price |  | at 6/30/23 |  | Exercise Price
$1.32 to $12.36 |  | 2,330,466 |  | 5.75 years |  | $4.05 |  | 1,868,960 |  | $2.33

X
- References No definition available. + Details
Name: | empr_ScheduleOfShareBasedCompensationSummarizesInformationAboutStockOptionsOutstandingTableTextBlock
Namespace Prefix: | empr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration