Significant Agreements	12 Months Ended
Significant Agreements	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Significant Agreements	Significant Agreements Commercial Agreements In August 2017, we entered into a distribution services agreement with an independent third party, Optime, to provide exclusive specialty pharmacy and patient services programs for Korlym beginning August 10, 2017. Under the terms of this agreement, Optime acts as the exclusive specialty pharmacy distributor of Korlym in the United States, subject to certain exceptions. Optime provides services related to pharmacy operations; patient intake, access and reimbursement; patient support; claims management and accounts receivable; and data and reporting. We provide Korlym to Optime, which it dispenses to patients. Optime does not purchase Korlym from us and it does not take title to the product. Title passes directly from us to the patient at the time the patient receives the medicine. The initial term of our agreement with Optime is five years, unless terminated earlier by us upon 90 days’ notice. The agreement contains additional customary termination provisions, representations, warranties and covenants. Subject to certain limitations, we have agreed to indemnify Optime for certain third-party claims related to the product, and we have each agreed to indemnify the other for certain breaches of representations, warranties, covenants and other specified matters. Manufacturing Agreements Related to Korlym We purchase all of our API for Korlym from PCAS. On July 25, 2018, we amended our agreement with PCAS to add a second manufacturing site and extend its term to December 31, 2021, with two one-year automatic renewals, unless either party provides 12 months advance written notice of its intent not to renew. The amendment provides exclusivity between PCAS and Corcept. In the event PCAS cannot meet our requirements, we may purchase API from another supplier. As of December 31, 2019, we had non-cancelable commitments to purchase $0.6 million worth of API from PCAS over the next 12 months. We have agreements with two third-party manufacturers to produce and bottle Korlym tablets. Research and Development Agreements Our clinical trials are conducted through the use of clinical research organizations (“CROs”). Our Phase 3 GRACE trial of relacorilant for the treatment of patients with Cushing’s syndrome is being conducted under an agreement with ICON plc (“ICON”). IQVIA (formerly, "Novella Clinical LLC") is helping us conduct our Phase 2 trial of relacorilant to treat patients with metastatic ovarian cancer and our Phase 1/2 trial of exicorilant to treat patients with CRPC. Medpace, Inc. ("Medpace") is helping us conduct our Phase 2 trial testing miricorilant's activity in reversing recent antipsychotic-induced weight gain. Our agreements with ICON and IQVIA may be terminated by us on 60 days’ written notice or sooner if the parties mutually agree. Our agreement with Medpace may be terminated by us without cause at any time. In July 2019, we entered into clinical study agreements with Quotient Sciences for clinical research on CORT113176, miricorilant and exicorilant, with initial terms of less than one year, with no extensions. We may terminate any of these agreements early should the study data justify or require termination. As of December 31, 2019, we had non-cancelable purchase commitments of approximately $0.4 million from Quotient over the next 12 months. Lease Agreement See discussion below in Note 5, Leases, regarding our office lease.