XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.25.1

STOCKHOLDERS' EQUITY AND EQUITY INCENTIVE PLANS (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2025
Equity [Abstract] |
Share-based Payment Arrangement, Activity |
|  | Number of Options |  | Weighted Average exercise price |  | Weighted remaining contractual term (years) |  | Aggregate Intrinsic Value
Outstanding as of January 1, 2025 |  | 16,321,014 |  | $ | 3.29 |  |  | 4.34 |  | $ | 5,212 |
Granted |  | — |  |  | $ | — |  |  |  |  |
Exercised |  | (1,252,550) |  |  | $ | 2.04 |  |  |  |  | $ | 445 |
Forfeited |  | (693,151) |  |  | $ | 4.72 |  |  |  |  |
Outstanding as of March 31, 2025 |  | 14,375,313 |  | $ | 3.33 |  |  | 4.71 |  | $ | 3,076 |
Exercisable options at end of the period |  | 14,370,625 |  | $ | 3.33 |  |  | 4.71 |  | $ | 3,076 |
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity |
|  | RSUs Outstanding |  | Weighted Average Grant Date Fair Value per Share
Outstanding as of January 1, 2025 |  | 12,331,745 |  | $1.56
RSUs granted |  | 8,418,514 |  | $2.58
RSUs vested |  | (2,112,442) |  | $1.69
RSUs forfeited (1) |  | (1,734,972) |  | $1.52
Unvested and Outstanding as of March 31, 2025 |  | 16,902,845 |  | $2.05
Schedule of share-based compensation expense by line item |
|  | Three Months Ended March 31,
|  | 2025 |  | 2024
Cost of revenue |  | $ | 128 |  |  | $ | 285 |
Research and development |  | 849 |  |  | 1,172 |
Sales and marketing |  | 432 |  |  | 770 |
General and administrative |  | 3,124 |  |  | 4,302 |
Total expenses |  | $ | 4,533 |  |  | $ | 6,529 |
Schedule Of Shares Of Common Stock Reserved For Future Issuance |
|  | March 31, 2025
Outstanding options |  | 14,375,313 |
Outstanding RSUs |  | 16,902,845 |
Shares reserved under 2021 Plan |  | 6,035,813 |
Total |  | 37,313,971 |

X
- Definition Schedule Of Shares Of Common Stock Reserved For Future Issuance + References No definition available. + Details
Name: | kltr_ScheduleOfSharesOfCommonStockReservedForFutureIssuanceTableTextBlockTableTextBlock
Namespace Prefix: | kltr_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -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_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration