Organization and Description of Business	3 Months Ended
Mar. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization and Description of Business	1. ORGANIZATION AND DESCRIPTION OF BUSINESS CareDx, Inc. (“CareDx” or the “Company”) together with its subsidiaries, is a global transplant diagnostics company with product offerings along the pre- and post-transplant continuum. The Company focuses on discovery, development and commercialization of clinically differentiated, high-value diagnostic surveillance solutions for transplant patients. In post-transplant diagnostics, the Company offers AlloMap®, which is a heart transplant molecular test (“AlloMap”). In pre-transplant diagnostics, the Company offers high quality products that increase the chance of successful transplants by facilitating a better match between a donor and a recipient of stem cells and organs. AlloMap is a gene expression test that helps clinicians monitor and identify heart transplant recipients with stable graft function who have a low probability of moderate to severe acute cellular rejection. Since 2008, the Company has sought to expand the adoption and utilization of its AlloMap solution through ongoing studies to substantiate the clinical utility and actionability of AlloMap, secure positive reimbursement decisions for AlloMap from large private and public payers, develop and enhance its relationships with key members of the transplant community, including opinion leaders at major transplant centers, and explore opportunities and technologies for the development of additional solutions for post-transplant surveillance. The Company believes the use of AlloMap, in conjunction with other clinical indicators, can help healthcare providers and their patients better manage long-term care following a heart transplant. In particular, the Company believes AlloMap can improve patient care by helping healthcare providers avoid the use of unnecessary, invasive surveillance biopsies and determine the appropriate dosage levels of immunosuppressants. AlloMap has received 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) for marketing and sale as a test to aid in the identification of recipients with a low probability of moderate or severe acute cellular rejection. A 510(k) submission is a premarketing submission made to the FDA. Clearance may be granted by the FDA if it finds the device or test provides satisfactory evidence pertaining to the claimed intended uses and indications for the device or test. The Company is also pursuing the development of additional products for transplant monitoring using a variety of technologies, including AlloSure®, its proprietary next-generation sequencing-based test to detect donor-derived cell-free DNA (“dd-cfDNA”) after transplantation. Through the acquisition of ImmuMetrix, Inc. (“IMX”), a privately held development-stage company working on dd-cfDNA-based solutions in transplantation and other fields, the Company added to its existing know-how, expertise, and intellectual property the ability to apply dd-cfDNA technology to the surveillance of transplant recipients, which has contributed to the development of AlloSure. With the acquisition of CareDx, International AB, formerly Allenex AB (“Allenex” or “Olerup”), on April 14, 2016, the Company develops, manufactures, markets and sells high quality products that increase the chance of successful transplants by facilitating a better match between a donor and a recipient of stem cells and organs. Olerup SSP is used to type HLA alleles based on the sequence specific primer (“SSP”) technology and has a market in Europe and selected other markets for pre-transplant solutions. The Company also offers XM-ONE®, a standardized test that identifies a patient’s antigens against HLA Class I or Class II, as well as antibodies against a donor’s endothelium. This cross-match test has primarily been used prior to kidney transplants. With the acquisition of the business assets of Conexio Genomics Pty Ltd (“Conexio”) on January 20, 2017, the Company offers a complete product range for sequence-based typing (“SBT”) of HLA alleles. Olerup SBT Resolver is a test kit for sequence based HLA typing, while Assign SBT is the companion software for sequence analysis. In 2014, Olerup began active development of a new HLA typing product, Olerup QTYPE, that uses real-time polymerase chain reaction (“PCR”) methodology. Olerup QTYPE was commercially launched at the end of September 2016. The Company’s headquarters are in Brisbane, California; primary operations are in Brisbane and Stockholm, Sweden; and the Company operates in two reportable segments. Liquidity and Going Concern The Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) effective December 31, 2016, which requires the Company to make certain disclosures if it concludes that there is substantial doubt about the entity’s ability to continue as a going concern within one year from the date of the issuance of these financial statements. The Company has incurred significant losses and negative cash flows from operations since its inception and had an accumulated deficit of $218.1 million at March 31, 2017. As of March 31, 2017, the Company had cash and cash equivalents of $12.2 million, and $32.4 million of debt outstanding under its debt obligations, net of debt discount. In March 2017, the Company received net proceeds of $24.0 million in connection with the issuance of a convertible debt obligation to JGB Collateral LLC and certain of its affiliates (“JGB”), of which $11.2 million was used to repay the Company’s outstanding debt obligations to East West Bank. In addition, the debt agreement requires the Company to maintain a minimum of $9.4 million of cash at a named financial institution. These funds are restricted as to withdrawal and are not available to the Company to fund its operations or repay indebtedness. Pursuant to the Company’s convertible debt financing agreements, the Company was required to file a registration statement with the SEC registering for resale the shares underlying the securities issued or issuable to JGB in the financing. Because the Company failed to file the registration statement with the SEC by April 17, 2017, commencing on April 18, 2017, the Company began accruing liquidated damages payable to JGB at a rate of approximately $7,000 per day. These damages accrued at the same rate on a daily basis until the registration statement was filed with the SEC on April 26, 2017. On May 3, 2017, JGB waived any claim or right to receive liquidated damages for the late filing of the registration statement. A quarterly debt covenant in the Company’s Term Loan Facility Agreement (the “Term Loan Facility”) with Danske Bank A/S (“Danske”) relating to maintaining an adequate leverage ratio was violated in June 30, 2016 and September 30, 2016. The Company obtained waivers from Danske for the violations of the debt covenant at June 30, 2016 and September 30, 2016. The debt covenant leverage ratio for December 31, 2016 and future periods was amended on March 27, 2017. The Company was in compliance with the amended debt covenants at December 31, 2016. The Company was not in compliance with the amended debt covenant leverage ratio at March 31, 2017 and for this reason, and the continuing liquidity matters, the long-term debt due to Danske is classified as a current liability in the condensed consolidated balance sheets as of March 31, 2017 and December 31, 2016. Additionally, if the loan was no longer available or Danske demanded repayment of the debt, the Company may not have sufficient capital to operate. The Company believes its cash and cash equivalents of $12.2 million at March 31, 2017 and expected revenues will not be sufficient to allow the Company to fund its current operations beyond June 30, 2017. The Company will require additional financing and/or refinancing of its current debt obligations to fund working capital, repay debt and pay its obligations. The Company may pursue financing and refinancing opportunities in both the private and public debt and equity markets through sales of debt or equity securities. Additional financing might include one or more offerings and one or more of a combination of discounted or at-the-market common stock, securities convertible into or exchangeable for shares of common stock, warrants or other rights to purchase or acquire common stock. However, there can be no assurance that the Company will be successful in acquiring additional funding at levels sufficient to fund its operations or on terms favorable to the Company. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of one year from the date of the issuance of these financial statements. If the Company is unsuccessful in its efforts to raise additional financing and/or refinance the Company’s indebtedness in the near term, the Company will be required to significantly reduce or cease operations. Additionally, due to the substantial doubt about the Company’s ability to continue operating as a going concern, the entire amount of borrowings was classified as current at March 31, 2017. The accompanying financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and the settlement of liabilities and commitments in the normal course of business. The financial statements do not reflect any adjustments relating to the recoverability and reclassifications of assets and liabilities that might be necessary if the Company is unable to continue as a going concern.

1. ORGANIZATION AND DESCRIPTION OF BUSINESS

CareDx, Inc. (“CareDx” or the “Company”) together with its subsidiaries, is a global transplant diagnostics company with product offerings along the pre- and post-transplant continuum. The Company focuses on discovery, development and commercialization of clinically differentiated, high-value diagnostic surveillance solutions for transplant patients. In post-transplant diagnostics, the Company offers AlloMap®, which is a heart transplant molecular test (“AlloMap”). In pre-transplant diagnostics, the Company offers high quality products that increase the chance of successful transplants by facilitating a better match between a donor and a recipient of stem cells and organs.

AlloMap is a gene expression test that helps clinicians monitor and identify heart transplant recipients with stable graft function who have a low probability of moderate to severe acute cellular rejection. Since 2008, the Company has sought to expand the adoption and utilization of its AlloMap solution through ongoing studies to substantiate the clinical utility and actionability of AlloMap, secure positive reimbursement decisions for AlloMap from large private and public payers, develop and enhance its relationships with key members of the transplant community, including opinion leaders at major transplant centers, and explore opportunities and technologies for the development of additional solutions for post-transplant surveillance. The Company believes the use of AlloMap, in conjunction with other clinical indicators, can help healthcare providers and their patients better manage long-term care following a heart transplant. In particular, the Company believes AlloMap can improve patient care by helping healthcare providers avoid the use of unnecessary, invasive surveillance biopsies and determine the appropriate dosage levels of immunosuppressants. AlloMap has received 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) for marketing and sale as a test to aid in the identification of recipients with a low probability of moderate or severe acute cellular rejection. A 510(k) submission is a premarketing submission made to the FDA. Clearance may be granted by the FDA if it finds the device or test provides satisfactory evidence pertaining to the claimed intended uses and indications for the device or test. The Company is also pursuing the development of additional products for transplant monitoring using a variety of technologies, including AlloSure®, its proprietary next-generation sequencing-based test to detect donor-derived cell-free DNA (“dd-cfDNA”) after transplantation. Through the acquisition of ImmuMetrix, Inc. (“IMX”), a privately held development-stage company working on dd-cfDNA-based solutions in transplantation and other fields, the Company added to its existing know-how, expertise, and intellectual property the ability to apply dd-cfDNA technology to the surveillance of transplant recipients, which has contributed to the development of AlloSure.

With the acquisition of CareDx, International AB, formerly Allenex AB (“Allenex” or “Olerup”), on April 14, 2016, the Company develops, manufactures, markets and sells high quality products that increase the chance of successful transplants by facilitating a better match between a donor and a recipient of stem cells and organs. Olerup SSP is used to type HLA alleles based on the sequence specific primer (“SSP”) technology and has a market in Europe and selected other markets for pre-transplant solutions. The Company also offers XM-ONE®, a standardized test that identifies a patient’s antigens against HLA Class I or Class II, as well as antibodies against a donor’s endothelium. This cross-match test has primarily been used prior to kidney transplants. With the acquisition of the business assets of Conexio Genomics Pty Ltd (“Conexio”) on January 20, 2017, the Company offers a complete product range for sequence-based typing (“SBT”) of HLA alleles. Olerup SBT Resolver is a test kit for sequence based HLA typing, while Assign SBT is the companion software for sequence analysis. In 2014, Olerup began active development of a new HLA typing product, Olerup QTYPE, that uses real-time polymerase chain reaction (“PCR”) methodology. Olerup QTYPE was commercially launched at the end of September 2016.

The Company’s headquarters are in Brisbane, California; primary operations are in Brisbane and Stockholm, Sweden; and the Company operates in two reportable segments.

Liquidity and Going Concern

The Company adopted Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) No. 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40) effective December 31, 2016, which requires the Company to make certain disclosures if it concludes that there is substantial doubt about the entity’s ability to continue as a going concern within one year from the date of the issuance of these financial statements. The Company has incurred significant losses and negative cash flows from operations since its inception and had an accumulated deficit of $218.1 million at March 31, 2017. As of March 31, 2017, the Company had cash and cash equivalents of $12.2 million, and $32.4 million of debt outstanding under its debt obligations, net of debt discount.

In March 2017, the Company received net proceeds of $24.0 million in connection with the issuance of a convertible debt obligation to JGB Collateral LLC and certain of its affiliates (“JGB”), of which $11.2 million was used to repay the Company’s outstanding debt obligations to East West Bank. In addition, the debt agreement requires the Company to maintain a minimum of $9.4 million of cash at a named financial institution. These funds are restricted as to withdrawal and are not available to the Company to fund its operations or repay indebtedness.

Pursuant to the Company’s convertible debt financing agreements, the Company was required to file a registration statement with the SEC registering for resale the shares underlying the securities issued or issuable to JGB in the financing. Because the Company failed to file the registration statement with the SEC by April 17, 2017, commencing on April 18, 2017, the Company began accruing liquidated damages payable to JGB at a rate of approximately $7,000 per day. These damages accrued at the same rate on a daily basis until the registration statement was filed with the SEC on April 26, 2017. On May 3, 2017, JGB waived any claim or right to receive liquidated damages for the late filing of the registration statement.

A quarterly debt covenant in the Company’s Term Loan Facility Agreement (the “Term Loan Facility”) with Danske Bank A/S (“Danske”) relating to maintaining an adequate leverage ratio was violated in June 30, 2016 and September 30, 2016. The Company obtained waivers from Danske for the violations of the debt covenant at June 30, 2016 and September 30, 2016. The debt covenant leverage ratio for December 31, 2016 and future periods was amended on March 27, 2017. The Company was in compliance with the amended debt covenants at December 31, 2016. The Company was not in compliance with the amended debt covenant leverage ratio at March 31, 2017 and for this reason, and the continuing liquidity matters, the long-term debt due to Danske is classified as a current liability in the condensed consolidated balance sheets as of March 31, 2017 and December 31, 2016. Additionally, if the loan was no longer available or Danske demanded repayment of the debt, the Company may not have sufficient capital to operate.

The Company believes its cash and cash equivalents of $12.2 million at March 31, 2017 and expected revenues will not be sufficient to allow the Company to fund its current operations beyond June 30, 2017. The Company will require additional financing and/or refinancing of its current debt obligations to fund working capital, repay debt and pay its obligations. The Company may pursue financing and refinancing opportunities in both the private and public debt and equity markets through sales of debt or equity securities. Additional financing might include one or more offerings and one or more of a combination of discounted or at-the-market common stock, securities convertible into or exchangeable for shares of common stock, warrants or other rights to purchase or acquire common stock. However, there can be no assurance that the Company will be successful in acquiring additional funding at levels sufficient to fund its operations or on terms favorable to the Company. These conditions raise substantial doubt about the Company’s ability to continue as a going concern for a period of one year from the date of the issuance of these financial statements. If the Company is unsuccessful in its efforts to raise additional financing and/or refinance the Company’s indebtedness in the near term, the Company will be required to significantly reduce or cease operations.

Additionally, due to the substantial doubt about the Company’s ability to continue operating as a going concern, the entire amount of borrowings was classified as current at March 31, 2017.

The accompanying financial statements have been prepared assuming that the Company will continue as a going concern, which contemplates the realization of assets and the settlement of liabilities and commitments in the normal course of business. The financial statements do not reflect any adjustments relating to the recoverability and reclassifications of assets and liabilities that might be necessary if the Company is unable to continue as a going concern.