XML 108 R93.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Subsequent Events - Additional Information (Detail) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Jul. 01, 2017 USD ($) | Apr. 19, 2017 shares | Mar. 15, 2017 USD ($) $ / shares shares | Mar. 02, 2017 USD ($) | Jul. 15, 2016 USD ($) | Apr. 25, 2016 USD ($) | Jan. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Apr. 18, 2017 $ / d | Jan. 30, 2015 $ / shares shares
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  |  |  |  | $ 0 | $ 15,625,000 | $ 0 |  |
Debt instrument maturity date |  |  |  |  |  |  |  |  | Dec. 01, 2018 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant to purchase stock, shares | shares |  |  |  |  |  |  |  |  |  |  |  |  | 34,483
Warrant to purchase of stock, per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.96
Oberland Complaint [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  |  |  |  | $ 1,400,000 |  |  |  |  |  |
Amount accrued for claim |  |  |  |  |  |  | $ 1,400,000 |  | $ 600,000 |  |  |  |
Subsequent Event [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 27,800,000 |  |  |  |  |  |  |  |  |
Warrant to purchase stock, shares | shares |  |  |  | 1,250,000 |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 24,000,000 |  |  |  |  |  |  |  |  |
Pay-off of term debt |  |  |  | 11,200,000 |  |  |  |  |  |  |  |  |
Minimum cash requirement |  |  |  | $ 9,400,000 |  |  |  |  |  |  |  |  |
Debt instrument maturity date |  |  |  | Feb. 28, 2020 |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 9.50% |  |  |  |  |  |  |  |  |
Conversion price per share | $ / shares |  |  |  | $ 4.56 |  |  |  |  |  |  |  |  |
Debt conversion description |  |  |  | Additionally, after September 1, 2017, upon the satisfaction of certain conditions, including the volume weighted average price of the Company’s common stock exceeding 250% of the Conversion Price for twenty consecutive trading days, the Company can require that the Debentures be converted into shares of the Company’s common stock, subject to certain limitations. |  |  |  |  |  |  |  |  |
Debt, possible redemption amount after March 1, 2018 |  |  |  | $ 937,500 |  |  |  |  |  |  |  |  |
Debt redemption description |  |  |  | Commencing on March 1, 2018, each of the holders of the Debentures shall have the right, at its option, to require the Company to redeem up to $937,500 of the outstanding principal amount of its Debenture per month. The Company will be required to promptly, but in any event no more than one trading day after the holder delivers a redemption notice to the Company, pay the applicable redemption amount in cash or, at the Company’s election and subject to certain conditions, in shares of the Company’s common stock. If the Company elects to pay the redemption amount in shares of the Company’s common stock, then the shares will be delivered based on a price equal to the lowest of (a) 88% of the average of the three lowest volume weighted average prices of the Company’s common stock over the prior 20 trading days, (b) 88% of the prior trading day’s volume weighted average price, or (c) the Conversion Price. The Company may only opt for payment in shares of the Company’s common stock if certain conditions are met. |  |  |  |  |  |  |  |  |
Percentage of average three lowest volume weighted average prices of common stock if elected to pay in shares |  |  |  | 88.00% |  |  |  |  |  |  |  |  |
Percentage of prior trading day's volume weighted average price if elected to pay in shares |  |  |  | 88.00% |  |  |  |  |  |  |  |  |
Warrant to purchase of stock, per share | $ / shares |  |  |  | $ 5.00 |  |  |  |  |  |  |  |  |
Warrants, issued date |  |  |  | Sep. 16, 2017 |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  | Sep. 15, 2022 |  |  |  |  |  |  |  |  |
Number of shares to seek shareholders approval to issue additional common stock | shares |  |  |  | 4,269,522 |  |  |  |  |  |  |  |  |
Percentage of gross proceeds from sale of debentures as fee of placement |  |  |  | 3.00% |  |  |  |  |  |  |  |  |
Date of first required payment |  |  |  | 2018-03 |  |  |  |  |  |  |  |  |
Warrants exercisable period from grant date |  |  |  | 185 days |  |  |  |  |  |  |  |  |
Warrants, term |  |  |  | 5 years 6 months |  |  |  |  |  |  |  |  |
Accruing liquidated damages payable amount per day | $ / d |  |  |  |  |  |  |  |  |  |  |  | 7,000 |
Subsequent Event [Member] | JGB Debt [Member] | If Debenture is accelerated prior to March 1, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of debt principal and interest outstanding repayment |  |  |  | 115.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | JGB Debt [Member] | If Debenture is accelerated after March 1, 2018 but prior to March 1, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of debt principal and interest outstanding repayment |  |  |  | 108.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | JGB Debt [Member] | If Debenture is accelerated after March 1, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of debt principal and interest outstanding repayment |  |  |  | 105.00% |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Oberland Complaint [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement amount |  |  |  |  | $ (600,000) |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restriction on sale of common stock | shares |  |  | 8,534,261 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Maximum [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Required repayment of debt per month |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |
Conexio [Member] | Scenario Forecast [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration to be paid for finished goods acquired |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |
Consideration to be paid for unfinished inventory acquired | $ 200,000 |  |  |  |  |  |  |  |  |  |  |  |
Conexio [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related quarterly payments, percentage on gross revenue |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Conexio [Member] | Subsequent Event [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition related quarterly payments on gross revenue |  |  |  |  |  |  |  | $ 700,000 |  |  |  |  |
Obligations and liabilities assumed for product warranty claims |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |

X
- Definition Accruing liquidated damages payable amount per day. + References No definition available. + Details
Name: | cdna_AccruingLiquidatedDamagesPayableAmountPerDay
Namespace Prefix: | cdna_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Business combination consideration to be paid for finished goods. + References No definition available. + Details
Name: | cdna_BusinessCombinationConsiderationToBePaidForFinishedGoods
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business combination consideration to be paid for unfinished inventory. + References No definition available. + Details
Name: | cdna_BusinessCombinationConsiderationToBePaidForUnfinishedInventory
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business combination, obligations and liabilities assumed for product warranty claims. + References No definition available. + Details
Name: | cdna_BusinessCombinationObligationsAndLiabilitiesAssumedForProductWarrantyClaims
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business combination payments on gross revenue. + References No definition available. + Details
Name: | cdna_BusinessCombinationPaymentsOnGrossRevenue
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Business combination payments percentage on gross revenue. + References No definition available. + Details
Name: | cdna_BusinessCombinationPaymentsPercentageOnGrossRevenue
Namespace Prefix: | cdna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of warrant or right, exercisable period of warrants from grant date. + References No definition available. + Details
Name: | cdna_ClassOfWarrantOrRightExercisablePeriodOfWarrantsFromGrantDate
Namespace Prefix: | cdna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of warrant or right, expiration term of warrants. + References No definition available. + Details
Name: | cdna_ClassOfWarrantOrRightExpirationTermOfWarrants
Namespace Prefix: | cdna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, month and year of first required payment. + References No definition available. + Details
Name: | cdna_DebtInstrumentMonthAndYearOfFirstRequiredPayment
Namespace Prefix: | cdna_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt possible redemption amount. + References No definition available. + Details
Name: | cdna_DebtPossibleRedemptionAmount
Namespace Prefix: | cdna_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares to seek shareholders approval to issue additional common stock. + References No definition available. + Details
Name: | cdna_NumberOfSharesToSeekShareholdersApprovalToIssueAdditionalCommonStock
Namespace Prefix: | cdna_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of gross proceeds from sale of debentures as fee of placement. + References No definition available. + Details
Name: | cdna_PercentageOfGrossProceedsFromSaleOfDebenturesAsFeeOfPlacement
Namespace Prefix: | cdna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of lowest volume weighed average price of common stock on redemption. + References No definition available. + Details
Name: | cdna_PercentageOfLowestVolumeWeightedAveragePriceOfCommonStockOnRedemption
Namespace Prefix: | cdna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of prior trading days volume weighed average price of common stock on redemption. + References No definition available. + Details
Name: | cdna_PercentageOfPriorTradingDaysVolumeWeightedAveragePriceOfCommonStockOnRedemption
Namespace Prefix: | cdna_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Restriction on sale of common stock. + References No definition available. + Details
Name: | cdna_RestrictionOnSaleOfCommonStock
Namespace Prefix: | cdna_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Warrants expiration date. + References No definition available. + Details
Name: | cdna_WarrantsExpirationDate
Namespace Prefix: | cdna_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date the warrants or rights are exercisable, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(3)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRighstDateFromWhichWarrantsOrRightsExercisable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The name of the original debt issue that has been converted in a noncash (or part noncash) transaction during the accounting period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References No definition available. + Details
Name: | us-gaap_DebtConversionDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
Name: | us-gaap_DebtInstrumentConvertibleConversionPrice1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Description of debt redemption features under terms of the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LitigationReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination. + References No definition available. + Details
Name: | us-gaap_ProceedsFromDebtNetOfIssuanceCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LitigationCaseAxis=cdna_OberlandComplaintMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=cdna_JBGDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentRedemptionPeriodAxis=us-gaap_DebtInstrumentRedemptionPeriodFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cdna_ConexioGenomicsPtyLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |