BASIS OF PRESENTATION (Policies)	3 Months Ended
Mar. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying Condensed Consolidated Financial Statements for the Company have been prepared in accordance with United States ("U.S.") generally accepted accounting principles (“GAAP”) for interim financial information and pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying financial statements contain all adjustments (consisting of normal and recurring accruals) necessary to present fairly all financial statements in accordance with GAAP. The Condensed Consolidated Financial Statements herein should be read in conjunction with the Company’s audited Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (the “Form 10-K”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period.
Revenue	The Company primarily generates revenue by performing genetic testing. Testing revenues are primarily derived from the following categories of products: Hereditary Cancer (myRisk, BRACAnalysis, BRACAnalysis CDx), Tumor Profiling (MyChoice CDx, Prolaris, and EndoPredict), Prenatal (Foresight, Prequel, and SneakPeek), and Pharmacogenomics (GeneSight). Revenue is recorded at the estimated transaction price. The Company has determined that the communication of test results indicates transfer of control for revenue recognition purposes.Under ASC 606, Revenue from Contracts with Customers ("ASC 606"), an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company performs its obligation under a contract with a customer by processing tests and communicating the test results to customers, in exchange for consideration from the customer. The Company has the right to bill its customers upon the completion of performance obligations and thus does not record contract assets. Occasionally, customers make payments prior to the Company’s performance of its contractual obligations. When this occurs, the Company records a contract liability as Deferred revenue, which is included in Accrued liabilities in the Condensed Consolidated Balance Sheets. In accordance with ASC 606, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its contracts that are one year or less, as the revenue is expected to be recognized within the next year. Furthermore, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its agreements wherein the Company’s right to payment is in an amount that directly corresponds with the value of the Company’s performance to date. In determining the transaction price, the Company includes an estimate of the expected amount of consideration as revenue. The Company applies this method consistently for similar contracts when estimating the effect of any uncertainty on an amount of variable consideration to which it will be entitled. An estimate of transaction price does not include any estimated amount of variable consideration that is constrained. In addition, the Company considers all the information (historical, current, and forecast) that is reasonably available to identify possible consideration amounts. In determining the expected value, the Company considers the probability of the variable consideration for each possible scenario. The Company also has significant experience with historical discount patterns and uses this experience to estimate transaction prices. The estimate of revenue is affected by assumptions in payor behavior such as changes in payor mix, payor collections, current customer contractual requirements, and experience with collections from third-party payors. When assessing the total consideration for insurance carriers and patients, revenues are further constrained for estimated refunds. The Company reserves certain amounts in Accrued liabilities in the Company’s Condensed Consolidated Balance Sheets in anticipation of requests for refunds of payments made previously by insurance carriers, which are accounted for as reductions in revenues in the Condensed Consolidated Statements of Operations and Comprehensive Loss. Cash collections for certain tests delivered may differ from rates estimated, primarily driven by changes in the estimated transaction price due to contractual adjustments, obtaining updated information from payors and patients that was unknown at the time the performance obligation was met, and settlements with third party payors. As a result of this new information, the Company updates its estimate of the amounts to be recognized for previously delivered tests, the impact of which was not material to the Company's Condensed Consolidated Statements of Operations for the three months ended March 31, 2023. During the three months ended March 31, 2022, the Company recognized $12.4 million in revenue, which resulted in a $0.12 impact to earnings per share, for tests in which the performance obligation of delivering test results was met in prior periods primarily driven by changes in the estimated transaction price.The Company applies the practical expedient related to costs to obtain or fulfill a contract since the amortization period for such costs will be one year or less. Accordingly, no costs incurred to obtain or fulfill a contract have been capitalized. The Company also applies the practical expedient for not adjusting revenue recognized for the effects of the time value of money. This practical expedient has been elected because the Company collects very little cash from customers under payment terms and the vast majority of payment terms have a payback period of less than one year.
Concentration of Credit Risk	Concentration of Credit RiskFinancial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Substantially all of the Company’s accounts receivable are with companies in the healthcare industry, U.S. and state governmental agencies, and individuals. The Company does not believe that receivables due from U.S. and state governmental agencies, such as Medicare, represent a credit risk since the related healthcare programs are funded by the U.S. and state governments.
Fair Value Measurements	The fair value of the Company’s financial instruments reflects the amounts that the Company estimates it will receive in connection with the sale of an asset or pay in connection with the transfer of a liability in an orderly transaction between market participants at the measurement date (exit price). The fair value hierarchy prioritizes the use of inputs used in valuation techniques into the following three levels: Level 1—quoted prices in active markets for identical assets and liabilities. Level 2—observable inputs other than quoted prices in active markets for identical assets and liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Some of the Company’s marketable securities primarily utilize broker quotes in a non-active market for valuation of these securities. Level 3—unobservable inputs. All of the Company’s financial instruments are valued using quoted prices in active markets or based on other observable inputs. For Level 2 securities, the Company uses a third-party pricing service which provides documentation on an ongoing basis that includes, among other things, pricing information with respect to reference data, methodology, inputs summarized by asset class, pricing application and corroborative information. For Level 3 contingent consideration related to the acquisitions of Sividon Diagnostics GmbH ("Sividon") and Gateway Genomics, LLC ("Gateway"), the Company reassesses the fair value of expected contingent consideration and the corresponding liability each reporting period using the Monte Carlo Method, which is consistent with the initial measurement of the expected contingent consideration liability. This fair value measurement is considered a Level 3 measurement because the Company estimates projections during the expected measurement periods of approximately 12.25 years and 2 years for Sividon and Gateway, respectively, utilizing various potential pay-out scenarios. Probabilities were applied to each potential scenario and the resulting values were discounted using a rate that considers weighted average cost of capital as well as a specific risk premium associated with the riskiness of the contingent consideration itself, the related projections, and the overall business. The contingent consideration liabilities are classified as components of Accrued liabilities and Other long-term liabilities in the Company’s Condensed Consolidated Balance Sheets. Changes to contingent consideration liabilities are reflected in Selling, general and administrative expense in the Company’s Condensed Consolidated Statements of Operations. Changes to the unobservable inputs could have a material impact on the Company’s financial statements.

BASIS OF PRESENTATION (Policies)

3 Months Ended

Mar. 31, 2023

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying Condensed Consolidated Financial Statements for the Company have been prepared in accordance with United States ("U.S.") generally accepted accounting principles (“GAAP”) for interim financial information and pursuant to the applicable rules and regulations of the Securities and Exchange Commission (“SEC”). All intercompany accounts and transactions have been eliminated in consolidation. In the opinion of management, the accompanying financial statements contain all adjustments (consisting of normal and recurring accruals) necessary to present fairly all financial statements in accordance with GAAP. The Condensed Consolidated Financial Statements herein should be read in conjunction with the Company’s audited Consolidated Financial Statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (the “Form 10-K”). The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting period.

Revenue

The Company primarily generates revenue by performing genetic testing. Testing revenues are primarily derived from the following categories of products: Hereditary Cancer (myRisk, BRACAnalysis, BRACAnalysis CDx), Tumor Profiling (MyChoice CDx, Prolaris, and EndoPredict), Prenatal (Foresight, Prequel, and SneakPeek), and Pharmacogenomics (GeneSight). Revenue is recorded at the estimated transaction price. The Company has determined that the communication of test results indicates transfer of control for revenue recognition purposes.Under ASC 606, Revenue from Contracts with Customers ("ASC 606"), an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The Company performs its obligation under a contract with a customer by processing tests and communicating the test results to customers, in exchange for consideration from the customer. The Company has the right to bill its customers upon the completion of performance obligations and thus does not record contract assets. Occasionally, customers make payments prior to the Company’s performance of its contractual obligations. When this occurs, the Company records a contract liability as Deferred revenue, which is included in Accrued liabilities in the Condensed Consolidated Balance Sheets.

In accordance with ASC 606, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its contracts that are one year or less, as the revenue is expected to be recognized within the next year. Furthermore, the Company has elected not to disclose the aggregate amount of the transaction price allocated to remaining performance obligations for its agreements wherein the Company’s right to payment is in an amount that directly corresponds with the value of the Company’s performance to date.

In determining the transaction price, the Company includes an estimate of the expected amount of consideration as revenue. The Company applies this method consistently for similar contracts when estimating the effect of any uncertainty on an amount of variable consideration to which it will be entitled. An estimate of transaction price does not include any estimated amount of variable consideration that is constrained. In addition, the Company considers all the information (historical, current, and forecast) that is reasonably available to identify possible consideration amounts. In determining the expected value, the Company considers the probability of the variable consideration for each possible scenario. The Company also has significant experience with historical discount patterns and uses this experience to estimate transaction prices.

The estimate of revenue is affected by assumptions in payor behavior such as changes in payor mix, payor collections, current customer contractual requirements, and experience with collections from third-party payors. When assessing the total consideration for insurance carriers and patients, revenues are further constrained for estimated refunds. The Company reserves certain amounts in Accrued liabilities in the Company’s Condensed Consolidated Balance Sheets in anticipation of requests for refunds of payments made previously by insurance carriers, which are accounted for as reductions in revenues in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Cash collections for certain tests delivered may differ from rates estimated, primarily driven by changes in the estimated transaction price due to contractual adjustments, obtaining updated information from payors and patients that was unknown at the time the performance obligation was met, and settlements with third party payors. As a result of this new information, the Company updates its estimate of the amounts to be recognized for previously delivered tests, the impact of which was not material to the Company's Condensed Consolidated Statements of Operations for the three months ended March 31, 2023. During the three months ended March 31, 2022, the Company recognized $12.4 million in revenue, which resulted in a $0.12 impact to earnings per share, for tests in which the performance obligation of delivering test results was met in prior periods primarily driven by changes in the estimated transaction price.The Company applies the practical expedient related to costs to obtain or fulfill a contract since the amortization period for such costs will be one year or less. Accordingly, no costs incurred to obtain or fulfill a contract have been capitalized. The Company also applies the practical expedient for not adjusting revenue recognized for the effects of the time value of money. This practical expedient has been elected because the Company collects very little cash from customers under payment terms and the vast majority of payment terms have a payback period of less than one year.

Concentration of Credit Risk

Concentration of Credit RiskFinancial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents and accounts receivable. Substantially all of the Company’s accounts receivable are with companies in the healthcare industry, U.S. and state governmental agencies, and individuals. The Company does not believe that receivables due from U.S. and state governmental agencies, such as Medicare, represent a credit risk since the related healthcare programs are funded by the U.S. and state governments.

Fair Value Measurements

The fair value of the Company’s financial instruments reflects the amounts that the Company estimates it will receive in connection with the sale of an asset or pay in connection with the transfer of a liability in an orderly transaction between market participants at the measurement date (exit price). The fair value hierarchy prioritizes the use of inputs used in valuation techniques into the following three levels:

Level 1—quoted prices in active markets for identical assets and liabilities.

Level 2—observable inputs other than quoted prices in active markets for identical assets and liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Some of the Company’s marketable securities primarily utilize broker quotes in a non-active market for valuation of these securities.

Level 3—unobservable inputs.

All of the Company’s financial instruments are valued using quoted prices in active markets or based on other observable inputs. For Level 2 securities, the Company uses a third-party pricing service which provides documentation on an ongoing basis that includes, among other things, pricing information with respect to reference data, methodology, inputs summarized by asset class, pricing application and corroborative information. For Level 3 contingent consideration related to the acquisitions of Sividon Diagnostics GmbH ("Sividon") and Gateway Genomics, LLC ("Gateway"), the Company reassesses the fair value of expected contingent consideration and the corresponding liability each reporting period using the Monte Carlo Method, which is consistent with the initial measurement of the expected contingent consideration liability. This fair value measurement is considered a Level 3 measurement because the Company estimates projections during the expected measurement periods of approximately 12.25 years and 2 years for Sividon and Gateway, respectively, utilizing various potential pay-out scenarios. Probabilities were applied to each potential scenario and the resulting values were discounted using a rate that considers weighted average cost of capital as well as a specific risk premium associated with the riskiness of the contingent consideration itself, the related projections, and the overall business. The contingent consideration liabilities are classified as components of Accrued liabilities and Other long-term liabilities in the Company’s Condensed Consolidated Balance Sheets. Changes to contingent consideration liabilities are reflected in Selling, general and administrative expense in the Company’s Condensed Consolidated Statements of Operations. Changes to the unobservable inputs could have a material impact on the Company’s financial statements.