Commitments, Contingencies, and Other Matters	6 Months Ended
Commitments, Contingencies, and Other Matters	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies, and Other Matters	12. Commitments, Contingencies, and Other Matters Minimum Purchase Commitments We have a non-cancellable cloud hosting arrangement with Amazon Web Services (“AWS”) that contains provisions for minimum purchase commitments. Specifically, purchase commitments under the agreement total $131.0 million over five years. The agreement, which started July 2021 and is now in its third year as of June 30, 2024, contains minimum spending requirements of $28.0 million in each of the third, fourth, and fifth years. Spending under this agreement for the three and six months ended June 30, 2024 totaled $10.7 million and $21.0 million, respectively. Spending under this agreement for the three and six months ended June 30, 2023 totaled $9.1 million and $18.5 million, respectively. The timing of payments under the agreement may vary. Exclusive of the AWS contract, we have other non-cancellable agreements for subscription software products that contain provisions stipulating minimum purchase commitments. However, the annual purchase commitments under these contracts are, individually and in the aggregate, immaterial to our consolidated financial statements. Pegasystems Litigation On May 29, 2020, we filed a civil complaint against Pegasystems, Inc. (“Pegasystems”) and Youyong Zou, a Virginia resident, in the Circuit Court for Fairfax County, Virginia. Appian Corp v. Pegasystems Inc. & Youyong Zou, No. 2020-07216 (Fairfax Cty. Ct.). On May 10, 2022, we announced the jury awarded us $2.036 billion in damages for misappropriation of our trade secrets and $1 in damages for violating the Virginia Computer Crimes Act. Pegasystems filed several post-trial motions seeking relief in the form of reducing the damages award or setting aside the jury’s verdict and either granting a new trial or entering judgment in Pegasystems’ favor. All of these motions were denied, and final judgment was entered by the Court on September 15, 2022. The final judgment reaffirmed the $2.036 billion in damages and also ordered Pegasystems to pay Appian $23.6 million in attorney's fees associated with the case as well as statutory post-judgment interest on the judgment at an annual rate of 6%, or approximately $122.0 million per year. Defendant Youyong Zou has satisfied the judgment of $5,000 (plus interest) against him in lieu of appealing that judgment. On September 15, 2022, Pegasystems filed a notice of appeal to the Court of Appeals of Virginia. On July 30, 2024, the Court of Appeals of Virginia issued a decision reversing the judgment against Pegasystems and remanding for a new trial. The decision rejected Pegasystems’ argument that Appian had not presented evidence that trade secrets were misappropriated, but reversed the judgment on the basis of evidentiary and damages rulings made by the trial court. On the same day, Appian announced its intention to appeal that decision to the Supreme Court of Virginia and seek to reinstate the full judgment against Pegasystems. A petition to the Supreme Court is expected to be filed by August 29, 2024. After that, the timeline to hear the petition will be in the control of the Supreme Court. We cannot predict the outcome of any appeals or the exact time it will take to resolve them. Judgment Preservation Insurance On September 1, 2023, we entered into a Judgment Preservation Insurance (“JPI”) policy in connection with our $2.036 billion judgment against Pegasystems. The total cost of the policy was $57.3 million and is comprised of the premium, a one-time broker fee, and Virginia lines tax. The policy provides up to $500.0 million of coverage. The total cost of the policy was capitalized and is being amortized on a straight-line basis over the estimated length of the appeals process. As of June 30, 2024, we estimated the length of the appeals process (solely for amortization purposes) to be approximately three years. This estimate is updated each reporting period. Amortization expense associated with the JPI premium is recorded to general and administrative expenses in our consolidated statements of operations. JPI amortization expense was $4.5 million and $9.0 million for the three and six months ended June 30, 2024. As of June 30, 2024, $18.1 million of the unamortized balance is classified as ‘Prepaid expenses and other current assets’ while the remaining $24.2 million is classified as 'Other assets’ on our consolidated balance sheets. We are currently evaluating the impact, if any, that the decision from the Court of Appeals of Virginia will have on our estimated length of the appeals process. Other Legal Matters From time to time, we are subject to legal, regulatory, and other proceedings and claims that arise in the ordinary course of business. Other than as disclosed elsewhere in this Quarterly Report, we are not presently a party to any legal proceedings that, if determined adversely to us, would individually or taken together have a material adverse effect on our business, operating results, financial condition, or cash flows. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources, and other factors. Share Repurchase Program In February 2024, our Board of Directors authorized a program to repurchase up to $50.0 million of our common stock from March 2024 to February 2026. In March 2024, we repurchased 1.3 million shares under this program at an average share price of $37.86, totaling an aggregate cost of $50.0 million. As of June 30, 2024, shareholders’ equity included 72.3 million shares outstanding, net of 1.2 million shares of common stock held in treasury.