Subsequent Event	9 Months Ended
Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Event	11. SUBSEQUENT EVENT On October 29, 2025, we entered into an Agreement and Plan of Merger (the “Merger Agreement”) with NEC Corporation, a company incorporated under the laws of Japan (“NEC”) and Canvas Transaction Company, Inc., a Delaware corporation and a wholly owned subsidiary of NEC (“Merger Sub”). Pursuant to the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into CSG (the “Merger”), with CSG continuing as the surviving corporation as a wholly owned subsidiary of NEC. Our Board has unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger, and, subject to the terms of the Merger Agreement, resolved to recommend that our stockholders adopt the Merger Agreement. Per the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of CSG common stock that is issued and outstanding immediately prior to the Effective Time (other than the Cancelled Shares and Dissenting Shares, as they are defined in the Merger Agreement), will be converted into the right to receive $80.70 per share in cash (the “Merger Consideration”). In addition, the Merger Agreement provides for the following treatment of our equity awards: • Each outstanding restricted stock award that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding restricted stock award will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding restricted stock award. • Each outstanding performance-based or market-based restricted stock award (other than the CEO Award (as defined below)) that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award (with applicable performance metrics generally deemed achieved at the greater of target and actual performance as of the latest practical date prior to the Effective Time) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding performance-based or market-based restricted stock award (other than the CEO Award) will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration (with applicable performance metrics deemed achieved at the greater of target and actual performance as of the latest practical date prior to the Effective Time), plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding performance-based or market-based restricted stock award. • The market-based restricted stock award granted to our CEO on December 10, 2024 (the “CEO Award”) will be converted into a deferred cash award based on the number of CSG shares underlying such award (with applicable performance metrics deemed achieved based on the Merger Consideration) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the CEO Award. • Additionally, each restricted stock award that would have vested and settled in accordance with its terms in 2026 will vest and settle on or prior to December 31, 2025, with any applicable performance-based vesting conditions deemed achieved based on actual performance as of the latest practical date. If the Merger is consummated, this will result in the outstanding loans under the 2025 Credit Agreement being repaid and commitments thereunder being terminated at the closing. If the Merger is consummated, this would also likely result in a conversion trigger for the 2023 Convertible Note holders. If the Merger is consummated, CSG shares will be delisted from the Nasdaq Global Select Market and deregistered under the Securities Exchange Act of 1934, as amended. The closing of the Merger is expected to occur during 2026, subject to the satisfaction of customary closing conditions including receipt of approval by CSG’s stockholders and required regulatory approvals. If the Merger Agreement is terminated under certain specified circumstances, including termination by CSG to accept and enter into a definitive agreement with respect to a superior proposal, CSG will be required to pay NEC a termination fee of $82,000,000. If the Merger Agreement is terminated under other certain specified circumstances, NEC will be required to pay CSG a termination fee of $135,000,000. The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.1 to our Current Report on Form 8-K filed with the SEC on October 29, 2025. We have incurred and will incur certain costs relating to the proposed Merger, such as financial advisory, legal, accounting, and other professional services fees. Future costs cannot be estimated at this time.

Subsequent Event

9 Months Ended

Sep. 30, 2025

11. SUBSEQUENT EVENT

On October 29, 2025, we entered into an Agreement and Plan of Merger (the “Merger Agreement”) with NEC Corporation, a company incorporated under the laws of Japan (“NEC”) and Canvas Transaction Company, Inc., a Delaware corporation and a wholly owned subsidiary of NEC (“Merger Sub”). Pursuant to the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub will merge with and into CSG (the “Merger”), with CSG continuing as the surviving corporation as a wholly owned subsidiary of NEC. Our Board has unanimously approved the Merger Agreement and the transactions contemplated thereby, including the Merger, and, subject to the terms of the Merger Agreement, resolved to recommend that our stockholders adopt the Merger Agreement.

Per the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the Merger (the “Effective Time”), each share of CSG common stock that is issued and outstanding immediately prior to the Effective Time (other than the Cancelled Shares and Dissenting Shares, as they are defined in the Merger Agreement), will be converted into the right to receive $80.70 per share in cash (the “Merger Consideration”).

In addition, the Merger Agreement provides for the following treatment of our equity awards:

•

Each outstanding restricted stock award that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding restricted stock award will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding restricted stock award.

•

Each outstanding performance-based or market-based restricted stock award (other than the CEO Award (as defined below)) that is vested as of immediately prior to the Effective Time (or that will vest solely as a result of the consummation of the transactions contemplated by the Merger Agreement, including, if the Effective Time occurs in 2026, restricted stock awards that would have completed their full vesting period and been settled in accordance with their terms in 2027) will be converted into the right to receive an amount in cash equal to the number of CSG shares underlying such award (with applicable performance metrics generally deemed achieved at the greater of target and actual performance as of the latest practical date prior to the Effective Time) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and become payable shortly following the Effective Time, and each other outstanding performance-based or market-based restricted stock award (other than the CEO Award) will be converted into a deferred cash award based on the number of CSG shares underlying such award multiplied by the Merger Consideration (with applicable performance metrics deemed achieved at the greater of target and actual performance as of the latest practical date prior to the Effective Time), plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the corresponding performance-based or market-based restricted stock award.

•

The market-based restricted stock award granted to our CEO on December 10, 2024 (the “CEO Award”) will be converted into a deferred cash award based on the number of CSG shares underlying such award (with applicable performance metrics deemed achieved based on the Merger Consideration) multiplied by the Merger Consideration, plus any applicable accrued and unpaid dividends, and will vest and become payable on the original time-based vesting schedule, subject to substantially the same terms and conditions as the CEO Award.

•

Additionally, each restricted stock award that would have vested and settled in accordance with its terms in 2026 will vest and settle on or prior to December 31, 2025, with any applicable performance-based vesting conditions deemed achieved based on actual performance as of the latest practical date.

If the Merger is consummated, this will result in the outstanding loans under the 2025 Credit Agreement being repaid and commitments thereunder being terminated at the closing. If the Merger is consummated, this would also likely result in a conversion trigger for the 2023 Convertible Note holders.

If the Merger is consummated, CSG shares will be delisted from the Nasdaq Global Select Market and deregistered under the Securities Exchange Act of 1934, as amended.

The closing of the Merger is expected to occur during 2026, subject to the satisfaction of customary closing conditions including receipt of approval by CSG’s stockholders and required regulatory approvals.

If the Merger Agreement is terminated under certain specified circumstances, including termination by CSG to accept and enter into a definitive agreement with respect to a superior proposal, CSG will be required to pay NEC a termination fee of $82,000,000. If the Merger Agreement is terminated under other certain specified circumstances, NEC will be required to pay CSG a termination fee of $135,000,000.

The foregoing summary of the Merger Agreement and the transactions contemplated thereby does not purport to be complete and is subject to, and qualified in its entirety by, the full text of the Merger Agreement, which is filed as Exhibit 2.1 to our Current Report on Form 8-K filed with the SEC on October 29, 2025.

We have incurred and will incur certain costs relating to the proposed Merger, such as financial advisory, legal, accounting, and other professional services fees. Future costs cannot be estimated at this time.