Subsequent Events	3 Months Ended
Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	17. SUBSEQUENT EVENTS Perceptive Term Loan On April 17, 2018, the Company entered into a Credit Agreement and Guaranty (the “Perceptive Credit Agreement”) with Perceptive as a lender and administrative agent for the several banks and other financial institutions or entities from time to time party to the Perceptive Credit Agreement for an initial term loan of $15.0 million (the “Tranche A Term Loan”), with a second tranche of $10.0 million available at the Company’s option, subject to the satisfaction of customary conditions (the “Tranche B Term Loan” and, together with the Tranche A Term Loan, the “Term Loan”). Approximately $11.1 million of the proceeds of the Tranche A Term Loan were used to fully repay the Company’s outstanding indebtedness with FastPartner AB, Mohammed Al Amoudi and Danske on April 17, 2018. The remainder of the proceeds will be used for general corporate purposes. The Tranche A Term Loan was funded on the date of closing. The Company paid a fee of $262,500 to Perceptive as the administrative agent. In addition, on April 17, 2018, the Company issued to Perceptive a warrant (the “Trance A Warrant” and, together with the Perceptive Credit Agreement and the Security Agreement, the “Financing Documents”), to purchase up to 140,000 shares of common stock of the Company at an initial exercise price of $8.60, subject to adjustment as provided in the Tranche A Warrant. The Tranche A Warrant will become initially exercisable commencing six months after the date of issuance and will terminate, if not earlier exercised, on April 17, 2025. The Tranche B Term Loan is available at the Company’s option at any time from April 17, 2018 to April 17, 2019, subject to the Company achieving certain product revenue targets, issuing the Tranche B Warrant (as defined below) and satisfying customary conditions. In the event the Company exercises its option for the Tranche B Term Loan, the Company will pay to Perceptive as the administrative agent out of the proceeds of the Tranche B Term Loan a fee in the amount equal to 1.75% of the principal amount of the Tranche B Term Loan advanced on such date. If the Tranche B Term Loan is funded, the Company will issue to Perceptive an additional warrant to purchase up to 93,333 shares of common stock (the “Tranche B Warrant”). The Tranche B Warrant will be on substantially the same terms, and in substantially the same form, as the Tranche A Warrant. In connection with the Perceptive Credit Agreement, the Company entered into a Security Agreement with Perceptive, as administrative agent (the “Security Agreement”). The Security Agreement provides that the Term Loan is secured by substantially all of the Company’s assets and a pledge of 65% of the equity interests of CareDx International AB. The Term Loan accrues interest per annum at 9.00% (the “Applicable Margin”) plus the greater of the one-month LIBOR or 1.5%. Payments under the Perceptive Credit Agreement are interest-only until the first principal payment is due on April 30, 2021, followed by monthly payments of principal and interest through the scheduled maturity date on April 17, 2023. The Term Loan may be prepaid by the Company, in whole or in part at any time, subject to a prepayment fee. The Perceptive Credit Agreement contains customary affirmative and restrictive covenants and representations and warranties, including financial reporting obligations and limitations on indebtedness, liens, fundamental changes, acquisitions, investments, dividends or distributions, corporate changes, asset sales, affiliate transactions, material agreements, licenses, sale and leaseback transactions, hazardous materials, accounting, compliance with laws and reimbursement of certain expenses of Perceptive. The Perceptive Credit Agreement also contains other customary provisions, such as expense reimbursement and confidentiality obligations, as well as indemnification rights for the benefit of Perceptive. The Perceptive Credit Agreement provides for customary events of default, including, among other things, nonpayments of principal, interest and other amounts, inaccuracies in representations and warranties, failure to comply with covenants, defaults on other material indebtedness, bankruptcy or insolvency, judgments, changes of control or impairments of Perceptive’s security interests. Upon the occurrence of an event of default and following any applicable cure periods, if any, the Applicable Margin shall automatically increase 3.00% per annum (the “Default Rate”). This Default Rate may be applied to the outstanding loan balances, and the Agent may declare all outstanding obligations immediately due and payable and take such other actions as set forth in the Perceptive Credit Agreement. License and Commercialization Agreement with Illumina On May 4, 2018, the Company entered into a License and Commercialization Agreement (the “License Agreement”) with Illumina, Inc. (“Illumina”), which provides the Company with worldwide distribution, development and commercialization rights to Illumina’s next generation sequencing (“NGS”) product line for use in the field of bone marrow transplantation diagnostic testing and solid organ transplantation diagnostic testing (the “Field”). Beginning on June 1, 2018, the Company will be the exclusive worldwide distributor of Illumina’s TruSight HLA v1 and v2 product lines, and associated Assign HLA software, for use in the Field. In addition, the Company will also be granted the exclusive right to develop and commercialize the next generation (v3) of the HLA product lines for use in the Field, as well as a NGS product for chimerism detection. The Company has agreed to use its own trademarks for commercialization of the development stage HLA and chimerism products and intends using names associated with an AlloSeq branding. Under the terms of the License Agreement, the Company made a $5.0 million initial payment to Illumina and will pay royalties in the mid-single to low-double digits on sales of future commercialized products. Pursuant to the License Agreement, the Company is obligated to complete timely development and commercialization of the future products, and has agreed to minimum purchase commitments of finished products and raw materials from Illumina through 2023. Illumina also agreed to provide transition and support services to the Company.

17. SUBSEQUENT EVENTS

Perceptive Term Loan

On April 17, 2018, the Company entered into a Credit Agreement and Guaranty (the “Perceptive Credit Agreement”) with Perceptive as a lender and administrative agent for the several banks and other financial institutions or entities from time to time party to the Perceptive Credit Agreement for an initial term loan of $15.0 million (the “Tranche A Term Loan”), with a second tranche of $10.0 million available at the Company’s option, subject to the satisfaction of customary conditions (the “Tranche B Term Loan” and, together with the Tranche A Term Loan, the “Term Loan”). Approximately $11.1 million of the proceeds of the Tranche A Term Loan were used to fully repay the Company’s outstanding indebtedness with FastPartner AB, Mohammed Al Amoudi and Danske on April 17, 2018. The remainder of the proceeds will be used for general corporate purposes.

The Tranche A Term Loan was funded on the date of closing. The Company paid a fee of $262,500 to Perceptive as the administrative agent. In addition, on April 17, 2018, the Company issued to Perceptive a warrant (the “Trance A Warrant” and, together with the Perceptive Credit Agreement and the Security Agreement, the “Financing Documents”), to purchase up to 140,000 shares of common stock of the Company at an initial exercise price of $8.60, subject to adjustment as provided in the Tranche A Warrant. The Tranche A Warrant will become initially exercisable commencing six months after the date of issuance and will terminate, if not earlier exercised, on April 17, 2025.

The Tranche B Term Loan is available at the Company’s option at any time from April 17, 2018 to April 17, 2019, subject to the Company achieving certain product revenue targets, issuing the Tranche B Warrant (as defined below) and satisfying customary conditions. In the event the Company exercises its option for the Tranche B Term Loan, the Company will pay to Perceptive as the administrative agent out of the proceeds of the Tranche B Term Loan a fee in the amount equal to 1.75% of the principal amount of the Tranche B Term Loan advanced on such date. If the Tranche B Term Loan is funded, the Company will issue to Perceptive an additional warrant to purchase up to 93,333 shares of common stock (the “Tranche B Warrant”). The Tranche B Warrant will be on substantially the same terms, and in substantially the same form, as the Tranche A Warrant.

In connection with the Perceptive Credit Agreement, the Company entered into a Security Agreement with Perceptive, as administrative agent (the “Security Agreement”). The Security Agreement provides that the Term Loan is secured by substantially all of the Company’s assets and a pledge of 65% of the equity interests of CareDx International AB. The Term Loan accrues interest per annum at 9.00% (the “Applicable Margin”) plus the greater of the one-month LIBOR or 1.5%. Payments under the Perceptive Credit Agreement are interest-only until the first principal payment is due on April 30, 2021, followed by monthly payments of principal and interest through the scheduled maturity date on April 17, 2023. The Term Loan may be prepaid by the Company, in whole or in part at any time, subject to a prepayment fee.

The Perceptive Credit Agreement contains customary affirmative and restrictive covenants and representations and warranties, including financial reporting obligations and limitations on indebtedness, liens, fundamental changes, acquisitions, investments, dividends or distributions, corporate changes, asset sales, affiliate transactions, material agreements, licenses, sale and leaseback transactions, hazardous materials, accounting, compliance with laws and reimbursement of certain expenses of Perceptive. The Perceptive Credit Agreement also contains other customary provisions, such as expense reimbursement and confidentiality obligations, as well as indemnification rights for the benefit of Perceptive.

The Perceptive Credit Agreement provides for customary events of default, including, among other things, nonpayments of principal, interest and other amounts, inaccuracies in representations and warranties, failure to comply with covenants, defaults on other material indebtedness, bankruptcy or insolvency, judgments, changes of control or impairments of Perceptive’s security interests. Upon the occurrence of an event of default and following any applicable cure periods, if any, the Applicable Margin shall automatically increase 3.00% per annum (the “Default Rate”). This Default Rate may be applied to the outstanding loan balances, and the Agent may declare all outstanding obligations immediately due and payable and take such other actions as set forth in the Perceptive Credit Agreement.

License and Commercialization Agreement with Illumina

On May 4, 2018, the Company entered into a License and Commercialization Agreement (the “License Agreement”) with Illumina, Inc. (“Illumina”), which provides the Company with worldwide distribution, development and commercialization rights to Illumina’s next generation sequencing (“NGS”) product line for use in the field of bone marrow transplantation diagnostic testing and solid organ transplantation diagnostic testing (the “Field”).

Beginning on June 1, 2018, the Company will be the exclusive worldwide distributor of Illumina’s TruSight HLA v1 and v2 product lines, and associated Assign HLA software, for use in the Field. In addition, the Company will also be granted the exclusive right to develop and commercialize the next generation (v3) of the HLA product lines for use in the Field, as well as a NGS product for chimerism detection. The Company has agreed to use its own trademarks for commercialization of the development stage HLA and chimerism products and intends using names associated with an AlloSeq branding.

Under the terms of the License Agreement, the Company made a $5.0 million initial payment to Illumina and will pay royalties in the mid-single to low-double digits on sales of future commercialized products. Pursuant to the License Agreement, the Company is obligated to complete timely development and commercialization of the future products, and has agreed to minimum purchase commitments of finished products and raw materials from Illumina through 2023. Illumina also agreed to provide transition and support services to the Company.