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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Schedule of assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements Using
As of December 31, 2024 | ​ | Fair Value |  | Prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Money Market Funds | ​ | $ | 276,374 | ​ | $ | 276,374 | ​ | $ | — | ​ | $ | —
Commercial Paper | ​ | ​ | 4,920 | ​ | ​ | — | ​ | ​ | 4,920 | ​ | ​ | —
Corporate Bonds | ​ | ​ | 250 | ​ | ​ | — | ​ | ​ | 250 | ​ | ​ | —
U.S. Treasury Securities | ​ | ​ | 5,983 | ​ | ​ | — | ​ | ​ | 5,983 | ​ | ​ | —
ecosio Cash Earn-outs | ​ | ​ | 74,400 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 74,400
ecosio Stock Earn-outs | ​ | ​ | 48,100 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 48,100
​ | ​ | Fair Value Measurements Using
As of December 31, 2023 | ​ | Fair Value |  | Prices in active markets for identical assets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
Money Market Funds | ​ | $ | 53,049 | ​ | $ | 53,049 | ​ | $ | — | ​ | $ | —
Commercial Paper | ​ | ​ | 7,168 | ​ | ​ | — | ​ | ​ | 7,168 | ​ | ​ | —
U.S. Treasury Securities | ​ | ​ | 3,621 | ​ | ​ | — | ​ | ​ | 3,621 | ​ | ​ | —
Tellutax Contingent Consideration | ​ | ​ | 4,900 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,900
Foreign Currency Forward Contracts | ​ | ​ | 849 | ​ | ​ | — | ​ | ​ | 849 | ​ | ​ | —
Schedule of additional information on Cash and Stock Earn-outs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Maximum | ​ | ​ | ​ | Fair Value | ​ | Fair Value
Cash Earn-outs/ Period | ​ | Payout | ​ | ​ | ​ | December 31, 2024 | ​ | at Acquisition Date
Year 1 - December 1, 2024 - December 1, 2025 | ​ | $ | 19,600 | ​ | ​ | ​ | $ | 17,900 | ​ | $ | 16,700
Year 2 - December 1, 2025 - December 1, 2026 | ​ | ​ | 30,625 | ​ | ​ | ​ | ​ | 24,400 | ​ | ​ | 23,200
Year 3 - December 1, 2026 - December 1, 2027 | ​ | ​ | 44,130 | ​ | ​ | ​ | ​ | 32,100 | ​ | ​ | 31,100
Total Cash Earn-outs | ​ | $ | 94,355 | ​ | ​ | ​ | $ | 74,400 | ​ | $ | 71,000
​ | ​ | Maximum | ​ | ​ | ​ | Fair Value | ​ | Fair Value
Stock Earn-outs/ Period | ​ | Payout (1) | ​ | ​ | ​ | December 31, 2024 | ​ | at Acquisition Date
Year 1 - December 1, 2024 - December 1, 2025 | ​ | $ | 12,000 | ​ | ​ | ​ | $ | 17,200 | ​ | $ | 12,200
Year 2 - December 1, 2025 - December 1, 2026 | ​ | ​ | 12,000 | ​ | ​ | ​ | ​ | 16,300 | ​ | ​ | 11,400
Year 3 - December 1, 2026 - December 1, 2027 | ​ | ​ | 11,000 | ​ | ​ | ​ | ​ | 14,600 | ​ | ​ | 10,400
Total Stock Earn-outs | ​ | $ | 35,000 | ​ | ​ | ​ | $ | 48,100 | ​ | $ | 34,000
(1) Maximum payout based on Vertex's August 6, 2024 opening share price of $37.02, as referenced in the purchase agreement.
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Changes in fair value of contingent consideration | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Tellutax | ​ | ecosio | ​ | ecosio
​ | ​ | Contingent | ​ | Contingent Consideration | ​ | Contingent Consideration
​ | ​ | Consideration | ​ | Cash Earn-outs | ​ | Stock Earn-outs
Balance, January 1, 2022 | ​ | $ | 2,500 | ​ | $ | — | ​ | $ | —
Fair value adjustments | ​ | ​ | 2,300 | ​ | ​ | — | ​ | ​ | —
Balance, December 31, 2022 | ​ | ​ | 4,800 | ​ | ​ | — | ​ | ​ | —
Fair value adjustments | ​ | ​ | 1,549 | ​ | ​ | — | ​ | ​ | —
Payments | ​ | ​ | (1,449) | ​ | ​ | — | ​ | ​ | —
Balance, December 31, 2023 | ​ | ​ | 4,900 | ​ | ​ | — | ​ | ​ | —
ecosio acquisition (Note 3) | ​ | ​ | — | ​ | ​ | 71,000 | ​ | ​ | 34,000
Fair value adjustments | ​ | ​ | (2,575) | ​ | ​ | 3,400 | ​ | ​ | 14,100
Payments | ​ | ​ | (2,325) | ​ | ​ | — | ​ | ​ | —
Balance, December 31, 2024 | ​ | $ | — | ​ | $ | 74,400 | ​ | $ | 48,100
Ecosio |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Summary of fair value of contingent consideration and unobservable inputs used for the Monte Carlo Simulation valuation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
Liabilities |  | Fair Value |  | ​ | Valuation Technique |  | ​ | Unobservable Inputs
ecosio Contingent Consideration - Cash Earn-outs | ​ | $ | 74,400 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | 7.7 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | 3.2 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
ecosio Contingent Consideration - Stock Earn-outs | ​ | $ | 48,100 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | 7.7 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | 3.2 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Acquisition Date
Liabilities |  | Fair Value |  | ​ | Valuation Technique |  | ​ | Unobservable Inputs
ecosio Contingent Consideration - Cash Earn-outs | ​ | $ | 71,000 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | 7.6 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | 3.5 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
ecosio Contingent Consideration - Stock Earn-outs | ​ | $ | 34,000 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | 21.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | 7.6 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | 3.5 | ​
Tellutax |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Summary of fair value of contingent consideration and unobservable inputs used for the Monte Carlo Simulation valuation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
Liability |  | Fair Value |  | ​ | Valuation Technique |  | ​ | Unobservable Inputs
Tellutax Contingent Consideration | ​ | $ | 4,900 | ​ | ​ | Monte Carlo Simulation | ​ | ​ | Revenue volatility | ​ | 60.0 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Revenue discount rate | ​ | 20.8 | %
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Term (in years) | ​ | 1.3 | ​
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of contingent payment arrangements including the terms that will result in payment and the accounting treatment that will be followed if such contingencies occur, including the potential impact on earnings per share if contingencies are to be settled in common stock of the entity. The description also may include the period over which amounts are expected to be paid, and changes in the amount since the previous reporting period. This also includes contingent options and commitments. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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