Commitments and Contingencies	6 Months Ended
Jun. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies Operating Leases The Company leases office space under non-cancelable operating lease agreements that expire on various dates through July 2043. As of June 30, 2026, the Company has $441.1 million in future minimum rent payments for its office space. Contractual Obligations As of June 30, 2026, the Company has $20.9 million in non-cancellable purchase obligations, consisting of primarily network equipment maintenance and software license contracts, of which $9.5 million will be fulfilled within one year. Legal Matters The Company is subject to certain legal proceedings described below, and from time to time may be subject to legal matters arising in the ordinary course of business. Where it is determined that a loss is probable and estimable in a given matter, the Company establishes an accrual. Any amounts accrued as of the balance sheet date are not material in any of the currently pending matters. In management’s opinion, the Company does not expect that the ultimate resolution of any currently pending legal matter in future periods will have a material effect on our financial condition, but could have a material effect on our results of operations for a given reporting period. On July 10, 2025, the City and County of San Francisco Tax Collector (“City of San Francisco”) issued a Corrected Tax Collector Decision on Petition for Redetermination to Bandwidth, asserting an Access Line Tax (“ALT”) deficiency in the amount of $3.8 million. The Company disputes the City of San Francisco’s application of the ALT to Bandwidth as well as the amount of the deficiency. On July 25, 2025, the Company paid and placed on deposit the amount under protest, as required by law. On August 7, 2025, Bandwidth filed a Claim for Refund with the City of San Francisco seeking a refund of the full amount. The Company to date has been unable to resolve the Claim for Refund with the City of San Francisco, and on December 31, 2025 the Company filed a Complaint for Refund challenging the assessment in the Superior Court of the State of California. The City of San Francisco answered the Complaint for Refund on March 27, 2026. The Company believes it has meritorious arguments that support a refund of the full amount. The Company is also involved as a defendant in a lawsuit alleging that the Company failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services in Cook and Kane Counties, Illinois, the City of Chicago, Illinois, and the State of Illinois. The Company intends to vigorously defend this lawsuit and believes that it has meritorious defenses.

The Company leases office space under non-cancelable operating lease agreements that expire on various dates through July 2043. As of June 30, 2026, the Company has $441.1 million in future minimum rent payments for its office space.

As of June 30, 2026, the Company has $20.9 million in non-cancellable purchase obligations, consisting of primarily network equipment maintenance and software license contracts, of which $9.5 million will be fulfilled within one year.

The Company is subject to certain legal proceedings described below, and from time to time may be subject to legal matters arising in the ordinary course of business. Where it is determined that a loss is probable and estimable in a given matter, the Company establishes an accrual. Any amounts accrued as of the balance sheet date are not material in any of the currently pending matters. In management’s opinion, the Company does not expect that the ultimate resolution of any currently pending legal matter in future periods will have a material effect on our financial condition, but could have a material effect on our results of operations for a given reporting period.

On July 10, 2025, the City and County of San Francisco Tax Collector (“City of San Francisco”) issued a Corrected Tax Collector Decision on Petition for Redetermination to Bandwidth, asserting an Access Line Tax (“ALT”) deficiency in the amount of $3.8 million. The Company disputes the City of San Francisco’s application of the ALT to Bandwidth as well as the amount of the deficiency. On July 25, 2025, the Company paid and placed on deposit the amount under protest, as required by law. On August 7, 2025, Bandwidth filed a Claim for Refund with the City of San Francisco seeking a refund of the full amount. The Company to date has been unable to resolve the Claim for Refund with the City of San Francisco, and on December 31, 2025 the Company filed a Complaint for Refund challenging the assessment in the Superior Court of the State of California. The City of San Francisco answered the Complaint for Refund on March 27, 2026. The Company believes it has meritorious arguments that support a refund of the full amount.

The Company is also involved as a defendant in a lawsuit alleging that the Company failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services in Cook and Kane Counties, Illinois, the City of Chicago, Illinois, and the State of Illinois. The Company intends to vigorously defend this lawsuit and believes that it has meritorious defenses.