Organization and Description of Business	6 Months Ended
Jun. 30, 2016
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 acquired in the acquisition of Allenex AB (“Allenex” or “Olerup”), is 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 Olerup SSP®, a set of Human Leukocyte Antigen (“HLA”) typing used prior to hematopoietic stem cell/bone marrow transplantation and organ transplantation. 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 Allenex, 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, 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. The Company, by way of Olerup’s sales and distribution agreement with Conexio Genomics (since acquired by Illumina, Inc.) offers a complete product range for sequence-based typing (“SBT”) of HLA alleles. SBT Resolver is a test kit for sequence based HLA typing, while AssignSBT is the companion software for sequence analysis. Because this SBT technology is primarily used in larger typing laboratories, it is a good complement to SSP technology, which is a more natural fit at smaller centers. In 2014, Olerup began active development of a new HLA typing product, QTYPE, that uses real-time PCR (q-PCR) methodology. This technology is based on SSP technology, which Olerup was well-situated to develop. The Company’s headquarters are in Brisbane, California; and primary operations are in Brisbane and Stockholm, Sweden; and it operates in two reportable segments. Liquidity and Going Concern The Company has incurred significant losses and negative cash flows from operations since its inception and had an accumulated deficit of $193.3 million at June 30, 2016. As of June 30, 2016, the Company had cash and cash equivalents of $17.1 million, and $28.2 million of debt outstanding under its debt and capital lease obligations, net of debt discount and issuance costs. On April 14, 2016, the Company acquired 98.3% of the outstanding common stock of Allenex. Allenex has 58 employees. Under the terms of the Conditional Share Purchase Agreements entered into on December 16, 2015, as amended, and the tender offer prospectus dated March 7, 2016, and as a result of the tender offer, the aggregate purchase consideration paid by the Company was approximately $34.1 million and consisted of (i) $26.9 million of cash, of which approximately $5.7 million was deferred purchase consideration and payable to Midroc Invest AB, FastPartner AB and Xenella Holding AB (collectively, the “Majority Shareholders”) by no later than March 31, 2017, and (ii) the issuance of 1,375,029 shares of the Company’s common stock valued at $7.2 million. Of the total cash consideration, $8.0 million of cash payable to the Majority Shareholders was deposited into an escrow account by the Company and subsequently invested in the Company by the Majority Shareholders through a purchase of the Company’s equity securities in a financing that was completed on June 15, 2016 (the “Subsequent Financing”). Upon the completion of the Subsequent Financing, certain contingencies in the Conditional Share Purchase Agreements were waived, and the deferred purchase consideration is payable to the Majority Shareholders by no later than March 31, 2017. The Company determined at the date of the acquisition that these contingencies would be waived. The Company intends to complete compulsory acquisition proceedings under Swedish law to purchase the remaining shares of Allenex. On June 8, 2016, the Company delisted Allenex’s common stock from Nasdaq Stockholm. See Note 5 for more detail about the Allenex acquisition. On April 14, 2016, the Company completed the sale of 591,860 units (“Units”) to certain accredited investors (the “Private Placement”) at a purchase price of $23.94 per Unit. Each Unit was comprised of (i) one share of the Company’s common stock, (ii) five shares of Series A Mandatorily Convertible Preferred Stock (“Series A Preferred”), and (iii) three warrants, each to purchase one share of the Company’s common stock. The aggregate gross proceeds to the Company from the Private Placement were approximately $14.2 million. Concurrently, the Company also entered into commitment letters (the “Commitment Letters”) pursuant to which the Majority Shareholders purchased the Company’s equity securities in the Subsequent Financing. The Company made payments of approximately $1.1 million and $97,000 in placement fees and other offering expenses, respectively, to placement agents in connection with the sale of the 591,860 Units in the Private Placement. Following the closing of the Private Placement, the Company agreed to a number of requirements, including submitting the Private Placement to the Company’s stockholders for approval pursuant to the rules of The NASDAQ Stock Market LLC (the “Requisite Stockholder Approval”), which was obtained on June 16, 2016, and granting certain registration rights, including the registration of shares sold in the Private Placement on a registration statement on Form S-3. Upon obtaining the Requisite Stockholder Approval on June 16, 2016, each share of Series A Preferred was converted into one share of the Company’s common stock. On May 27, 2016, the Company filed a registration statement on Form S-3 (the “2016 Form S-3”) with the Securities and Exchange Commission (the “SEC”) to register for resale the shares of common stock issued or issuable upon conversion of the Series A Preferred and upon exercise of the warrants sold in the Private Placement. The 2016 Form S-3 was declared effective by the SEC on July 12, 2016. On June 15, 2016, the Company completed the Subsequent Financing for the sale of an additional 334,169 Units to the Majority Shareholders. The aggregate gross proceeds to the Company from the Subsequent Financing were $8.0 million. Securities issued in the Subsequent Financing were issued and sold at the same price and upon substantially the same terms as the Units issued in the Private Placement. See Note 13 for more detail about the Private Placement and Subsequent Financing. 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. Due to insufficient working capital in Allenex, a debt covenant in the Term Loan Facility relating to maintaining an adequate leverage ratio was violated at June 30, 2016. The Company obtained a waiver from Danske Bank A/S (“Danske”) for this violation of the debt covenant. While Allenex received a waiver from Danske for the violation as of June 30, 2016, due to continuing liquidity matters, Allenex has determined that it is not probable that it will be in compliance with this covenant in future periods. For these reasons, the long-term debt was reclassified to current liabilities and resulted in a reduction in working capital. Additionally, if the loan was no longer available or Danske demanded repayment of the debt, the Company may not have sufficient capital to operate and there would be substantial doubt about its ability to continue as a going concern. On June 10, 2016, the Centers for Medicare and Medicaid Services (‘CMS”), announced proposed changes in reimbursement for a number of established molecular diagnostic tests, including AlloMap. Under the draft fee schedule, which would become effective on January 1, 2017, AlloMap reimbursement from CMS for patients covered by Medicare would be reduced from $2,821 to $732. The draft fee schedule was subject to an open comment period through August 10, 2016, and has not yet been adopted as final. The Company provided comments to CMS. If the current proposal is adopted, it could cause the Company to discontinue testing for Medicare patients. Given the significant portion of payments to the Company represented by Medicare, any resulting lower test revenue would have a material adverse effect on the Company’s operations. Absent additional and sufficient financing, in addition to Danske not demanding repayment of the outstanding debt, the Company will likely exhaust its cash and cash equivalents in the quarter ending December 2016 unless the Company substantially reduces its costs and operations, including research and development activities, marketing activities and programs, and other general and administrative expenses. As a result of the Company’s obligations and lack of immediately available financial resources, there is uncertainty regarding the Company’s ability to maintain liquidity sufficient to operate its business effectively, which raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unsuccessful in its efforts to raise outside financing or refinance the Company’s indebtedness in the near term, the Company will be required to significantly reduce or cease operations. The accompanying financial statements have been prepared assuming that the Company will continue as a going concern through December 31, 2016, 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 acquired in the acquisition of Allenex AB (“Allenex” or “Olerup”), is 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 Olerup SSP®, a set of Human Leukocyte Antigen (“HLA”) typing used prior to hematopoietic stem cell/bone marrow transplantation and organ transplantation.

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 Allenex, 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, 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. The Company, by way of Olerup’s sales and distribution agreement with Conexio Genomics (since acquired by Illumina, Inc.) offers a complete product range for sequence-based typing (“SBT”) of HLA alleles. SBT Resolver is a test kit for sequence based HLA typing, while AssignSBT is the companion software for sequence analysis. Because this SBT technology is primarily used in larger typing laboratories, it is a good complement to SSP technology, which is a more natural fit at smaller centers. In 2014, Olerup began active development of a new HLA typing product, QTYPE, that uses real-time PCR (q-PCR) methodology. This technology is based on SSP technology, which Olerup was well-situated to develop.

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

Liquidity and Going Concern

The Company has incurred significant losses and negative cash flows from operations since its inception and had an accumulated deficit of $193.3 million at June 30, 2016. As of June 30, 2016, the Company had cash and cash equivalents of $17.1 million, and $28.2 million of debt outstanding under its debt and capital lease obligations, net of debt discount and issuance costs.

On April 14, 2016, the Company acquired 98.3% of the outstanding common stock of Allenex. Allenex has 58 employees. Under the terms of the Conditional Share Purchase Agreements entered into on December 16, 2015, as amended, and the tender offer prospectus dated March 7, 2016, and as a result of the tender offer, the aggregate purchase consideration paid by the Company was approximately $34.1 million and consisted of (i) $26.9 million of cash, of which approximately $5.7 million was deferred purchase consideration and payable to Midroc Invest AB, FastPartner AB and Xenella Holding AB (collectively, the “Majority Shareholders”) by no later than March 31, 2017, and (ii) the issuance of 1,375,029 shares of the Company’s common stock valued at $7.2 million. Of the total cash consideration, $8.0 million of cash payable to the Majority Shareholders was deposited into an escrow account by the Company and subsequently invested in the Company by the Majority Shareholders through a purchase of the Company’s equity securities in a financing that was completed on June 15, 2016 (the “Subsequent Financing”). Upon the completion of the Subsequent Financing, certain contingencies in the Conditional Share Purchase Agreements were waived, and the deferred purchase consideration is payable to the Majority Shareholders by no later than March 31, 2017. The Company determined at the date of the acquisition that these contingencies would be waived. The Company intends to complete compulsory acquisition proceedings under Swedish law to purchase the remaining shares of Allenex. On June 8, 2016, the Company delisted Allenex’s common stock from Nasdaq Stockholm. See Note 5 for more detail about the Allenex acquisition.

On April 14, 2016, the Company completed the sale of 591,860 units (“Units”) to certain accredited investors (the “Private Placement”) at a purchase price of $23.94 per Unit. Each Unit was comprised of (i) one share of the Company’s common stock, (ii) five shares of Series A Mandatorily Convertible Preferred Stock (“Series A Preferred”), and (iii) three warrants, each to purchase one share of the Company’s common stock. The aggregate gross proceeds to the Company from the Private Placement were approximately $14.2 million. Concurrently, the Company also entered into commitment letters (the “Commitment Letters”) pursuant to which the Majority Shareholders purchased the Company’s equity securities in the Subsequent Financing. The Company made payments of approximately $1.1 million and $97,000 in placement fees and other offering expenses, respectively, to placement agents in connection with the sale of the 591,860 Units in the Private Placement. Following the closing of the Private Placement, the Company agreed to a number of requirements, including submitting the Private Placement to the Company’s stockholders for approval pursuant to the rules of The NASDAQ Stock Market LLC (the “Requisite Stockholder Approval”), which was obtained on June 16, 2016, and granting certain registration rights, including the registration of shares sold in the Private Placement on a registration statement on Form S-3. Upon obtaining the Requisite Stockholder Approval on June 16, 2016, each share of Series A Preferred was converted into one share of the Company’s common stock. On May 27, 2016, the Company filed a registration statement on Form S-3 (the “2016 Form S-3”) with the Securities and Exchange Commission (the “SEC”) to register for resale the shares of common stock issued or issuable upon conversion of the Series A Preferred and upon exercise of the warrants sold in the Private Placement. The 2016 Form S-3 was declared effective by the SEC on July 12, 2016. On June 15, 2016, the Company completed the Subsequent Financing for the sale of an additional 334,169 Units to the Majority Shareholders. The aggregate gross proceeds to the Company from the Subsequent Financing were $8.0 million. Securities issued in the Subsequent Financing were issued and sold at the same price and upon substantially the same terms as the Units issued in the Private Placement. See Note 13 for more detail about the Private Placement and Subsequent Financing.

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.

Due to insufficient working capital in Allenex, a debt covenant in the Term Loan Facility relating to maintaining an adequate leverage ratio was violated at June 30, 2016. The Company obtained a waiver from Danske Bank A/S (“Danske”) for this violation of the debt covenant. While Allenex received a waiver from Danske for the violation as of June 30, 2016, due to continuing liquidity matters, Allenex has determined that it is not probable that it will be in compliance with this covenant in future periods. For these reasons, the long-term debt was reclassified to current liabilities and resulted in a reduction in working capital. Additionally, if the loan was no longer available or Danske demanded repayment of the debt, the Company may not have sufficient capital to operate and there would be substantial doubt about its ability to continue as a going concern.

On June 10, 2016, the Centers for Medicare and Medicaid Services (‘CMS”), announced proposed changes in reimbursement for a number of established molecular diagnostic tests, including AlloMap. Under the draft fee schedule, which would become effective on January 1, 2017, AlloMap reimbursement from CMS for patients covered by Medicare would be reduced from $2,821 to $732. The draft fee schedule was subject to an open comment period through August 10, 2016, and has not yet been adopted as final. The Company provided comments to CMS. If the current proposal is adopted, it could cause the Company to discontinue testing for Medicare patients. Given the significant portion of payments to the Company represented by Medicare, any resulting lower test revenue would have a material adverse effect on the Company’s operations.

Absent additional and sufficient financing, in addition to Danske not demanding repayment of the outstanding debt, the Company will likely exhaust its cash and cash equivalents in the quarter ending December 2016 unless the Company substantially reduces its costs and operations, including research and development activities, marketing activities and programs, and other general and administrative expenses. As a result of the Company’s obligations and lack of immediately available financial resources, there is uncertainty regarding the Company’s ability to maintain liquidity sufficient to operate its business effectively, which raises substantial doubt about the Company’s ability to continue as a going concern. If the Company is unsuccessful in its efforts to raise outside financing or refinance the Company’s indebtedness in the near term, the Company will be required to significantly reduce or cease operations.

The accompanying financial statements have been prepared assuming that the Company will continue as a going concern through December 31, 2016, 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.