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Summary of Significant Accounting Policies | 3 Months Ended
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Mar. 31, 2021
Summary of Significant Accounting Policies |
Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies During the three months ended March 31, 2021, there were no material changes to the Company’s significant accounting policies as disclosed in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (filed on February 26, 2021), except as described in Recently Adopted Accounting Pronouncements below. Basis of Presentation The accompanying unaudited interim condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. The unaudited interim condensed consolidated financial information includes only adjustments of a normal recurring nature necessary for a fair presentation of the results of operations, financial position, changes in stockholders’ equity, and cash flows. The results of operations for the three and three months ended March 31, 2021, are not necessarily indicative of the results for the full year or the results for any future periods. The condensed consolidated balance sheet as of December 31, 2020 has been derived from audited financial statements at that date, these financial statements should be read in conjunction with the audited financial statements, and related notes for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the SEC on February 26, 2021. Liquidity Matters The Company has incurred net losses since its inception and anticipates net losses and negative operating cash flows for the near future. The Company had a net loss of $63.9 million for the three months ended March 31, 2021 and an accumulated deficit of $987.0 million as of March 31, 2021. As of March 31, 2021, the Company had $65.3 million in cash, cash equivalents, and restricted cash, $588.4 million in marketable securities, $50.1 million of outstanding balance of the Credit Line (as defined in Note 10, Debt) including accrued interest, and $287.5 million outstanding principal balance of its 2.25% Convertible Senior Notes (the “Convertible Notes”). The Company used a portion of the net proceeds from the offering of the Convertible Notes to repay its obligations under its 2017 Term Loan with OrbiMed. While the Company has introduced multiple products that are generating revenues, these revenues have not been sufficient to fund all operations. Accordingly, the Company has funded the portion of operating costs that exceeds revenues through a combination of equity issuances, debt issuances, and other financings. The Company continues to develop and commercialize future products and, consequently, it will need to generate additional revenues to achieve future profitability and may need to raise additional equity or debt financing. If the Company raises additional funds by issuing equity securities, its stockholders will experience dilution. Additional debt financing, if available, may involve covenants restricting its operations or its ability to incur additional debt. Any additional debt financing or additional equity that the Company raises may contain terms that are not favorable to it or its stockholders and requires significant debt service payments, which diverts resources from other activities. Additional financing may not be available at all, or in amounts or on terms acceptable to the Company. If the Company is unable to obtain additional financing, it may be required to delay the development and commercialization of its products and significantly scale back its business and operations. In April 2019, the Company completed an underwritten equity offering and sold 6,052,631 shares of its common stock at a price of $19 per share to the public. Before offering expenses of $0.6 million, the Company received proceeds of $108.1 million net of the underwriting discount. In October 2019, the Company completed another underwritten equity offering and sold 6,571,428 shares of its common stock at a price of $35 per share to the public. Before offering expenses of $0.4 million, the Company received proceeds of $216.2 million net of the underwriting discount. In September 2020, the Company completed an additional underwritten equity offering and sold 4,791,665 shares of its common stock at a price of $60.00 per share to the public. Before offering expenses of $0.3 million, the Company received proceeds of $271.0 million net of the underwriting discount. Based on the Company’s current business plan, the Company believes that its existing cash and marketable securities will be sufficient to meet its anticipated cash requirements for at least 12 months after May 6, 2021. Principles of Consolidation ​ The accompanying condensed consolidated financial statements include all the accounts of the Company and its subsidiaries. The Company established a subsidiary that operates in the state of Texas to support the Company’s laboratory and operational functions. All intercompany balances and transactions have been eliminated. Use of Estimates The preparation of financial statements in accordance with generally accepted accounting principles (GAAP) in the United States requires management to make estimates and assumptions about future events that affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities, and reported amounts of revenues and expenses. Significant items subject to such estimates include the allowance for doubtful accounts calculated based on the average selling price expected to be received from insurance payors, the operating right-of-use assets and the associated lease liabilities, deferred revenues associated with unsatisfied performance obligations, accrued liability for potential refund requests, the valuation of the Convertible Notes, stock-based compensation, the fair value of common stock, income tax uncertainties, and the expected consideration to be received from contracts with customers. These estimates and assumptions are based on management's best estimates and judgment. Management regularly evaluates its estimates and assumptions using historical experience and other factors, including contractual terms and statutory limits; however, actual results could differ from these estimates and could have an adverse effect on the Company's financial statements. Credit Losses ​ Trade accounts receivable and other receivables. The allowance for doubtful accounts is based on the Company’s assessment of the collectability of customer accounts. The Company regularly reviews the allowance by considering factors such as historical experience, credit quality, the age of the accounts receivable balances, and current economic conditions that may affect a customer’s ability to pay. ​ The following is a roll-forward of the allowances for credit losses related to trade accounts receivable and other receivables for the three months ended March 31, 2021: ​
​ | ​ | ​ | ​
​ | ​ | Three months ended
​ |  | March 31,
​ | ​ | 2021
​ | ​ | ​ | (in thousands)
Beginning balance | ​ | $ | 4,220
Write-offs | ​ | ​ | (110)
Total | ​ | $ | 4,110
​ | ​ | ​ | ​
​ Available-for-sale debt securities. The amended guidance from ASU 2016-13 requires the measurement of expected credit losses for available-for-sale debt securities held at the reporting date over the remaining life based on historical experience, current conditions, and reasonable and supportable forecasts. The Company evaluated its investment portfolio under the new available-for-sale debt securities impairment model guidance. The vast majority of the Company’s investment portfolio are low risk, investment grade securities. ​ Investments Investments consist primarily of debt securities such as U.S. Treasuries, U.S. agency and municipal bonds. Management determines the appropriate classification of securities at the time of purchase and re-evaluates such determination at each balance sheet date. The Company generally classifies its entire investment portfolio as available-for-sale. The Company views its available-for-sale portfolio as available for use in current operations. Accordingly, the Company classifies all investments as short-term, irrespective of maturity date. Available-for-sale securities are carried at fair value, with unrealized gains and losses reported in accumulated other comprehensive income (loss), which is a separate component of stockholders’ equity. Risk and Uncertainties The Company is subject to risks and uncertainties as a result of the COVID-19 pandemic. The extent of the impact of the COVID-19 pandemic on the Company's business is highly uncertain and difficult to predict, and the full extent and duration of the impact of the COVID-19 pandemic on its business, its operations, and the global economy as a whole is not yet known. While the Company’s test volumes grew during the three months ended March 31, 2021, the overall average selling prices for its tests decreased in the three months ended March 31, 2021 compared to the three months ended March 31, 2020, the Company cannot predict the potential nature, magnitude and duration of the effects of the COVID-19 pandemic on the macroeconomic environment. Financial instruments that potentially subject the Company to credit risk consist of cash, accounts receivable and investments. The Company limits its exposure to credit loss by placing its cash in financial institutions with high credit ratings. The Company's cash may consist of deposits held with banks that may at times exceed federally insured limits. The Company performs evaluations of the relative credit standing of these financial institutions and limits the amount of credit exposure with any one institution. The Company performs evaluations of financial conditions for insurance carriers, patients, clinics and laboratory partners and generally does not require collateral to support credit sales. For the three months ended March 31, 2021, and 2020, there were no customers exceeding 10% of total revenues on an individual basis. As of March 31, 2021 and December 31, 2020, there were no customers with an outstanding balance exceeding 10% of net accounts receivable. Accumulated Other Comprehensive Income (Loss) Comprehensive loss and its components encompass all changes in equity other than those with stockholders, and include net loss, unrealized gains and losses on available-for-sale marketable securities. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three months ended | ​
​ | March 31, | ​
​ | 2021 | ​ | 2020 | ​
​ | (in thousands) | ​
Beginning balance | $ | 4,259 | ​ | $ | 919 | ​
Net unrealized gain (loss) on available-for-sale securities, net of tax | ​ | (1,062) | ​ | ​ | 4,747 | ​
Ending balance | $ | 3,197 | ​ | $ | 5,666 | ​
​ Recent Accounting Pronouncements From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) under its accounting standard codifications or other standard setting bodies and adopted by the Company as of the specified effective date. Unless otherwise discussed below, the Company believes that the impact of accounting standards updates recently issued that are not yet effective will not have a material impact on its financial position or results of operations upon adoption. Recently Adopted Accounting Pronouncements Fair Value Measurement In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. ASU 2018-13 proposes new disclosure requirements for unrealized gains or losses recognized in other comprehensive income that are attributable to fair value changes in assets and liabilities categorized within Level III of the fair value hierarchy, as well as quantitative information about significant unobservable inputs used to value such assets and liabilities. It eliminates the requirement to disclose the reasons for the transfers of assets and liabilities measured in fair value on a recurring basis between Level I and Level II. The Company has adopted this ASU as of January 1, 2020, which did not have a material impact on its consolidated financial statements. Goodwill - Internal-Use Software In August 2018, the FASB issued ASU 2018‑15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350‑40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract. The amendments in this update align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The accounting for the service element of a hosting arrangement that is a service contract is not affected by the amendments in this update. The Company adopted ASU 2018-15 as of January 1, 2020 using the prospective approach, which did not have a material impact on its condensed consolidated financial statements upon the adoption. Credit Losses In June 2016, the FASB issued ASU 2016-13, Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments and also issued subsequent amendments to the initial guidance: ASU 2018-19, ASU 2019-04, and ASU 2019-05. The standard requires measurement and recognition of expected credit losses for financial assets by requiring an allowance to be recorded as an offset to the amortized cost of such assets. For available-for-sale debt securities, expected credit losses should be estimated when the fair value of the debt securities is below their associated amortized costs. The Company adopted ASU 2016-13, as amended, effective January 1, 2020 using the modified retrospective method and recorded a cumulative-effect adjustment of $0.4 million in retained earnings as of January 1, 2020. Collaborative Arrangements In November 2018, the FASB issued ASU 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606, which clarifies that certain transactions between participants in a collaborative arrangement should be accounted for under ASC 606 when the counterparty is a customer. In addition, Topic 808 precludes an entity from presenting consideration from a transaction in a collaborative arrangement as revenue from contracts with customers if the counterparty is not a customer for that transaction. This guidance will be effective for the Company beginning January 1, 2020. The Company has adopted this standard as of January 1, 2020, which did not have a material impact on its condensed consolidated financial statements upon the adoption. Income Taxes In December 2019, the FASB issued ASU 2019-12, Simplifying the Accounting for Income Taxes (Topic 740), which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020. An entity that elects early adoption must adopt all the amendments in the same period. Most amendments within this ASU are required to be applied on a prospective basis, while certain amendments must be applied on a retrospective or modified retrospective basis. The Company has adopted this standard as of September 30, 2020, which did not have a material impact on its condensed consolidated financial statements upon the adoption. In October 2020, ASU 2020-10, Codification Improvements, was issued which simplifies the existing codification. The guidance includes presentation disclosures for the amount of income tax expense or benefit related to other comprehensive income. ASU 2010-10 is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early application of the amendments is permitted for public business entities for any annual or interim period for which financial statements have not been issued. The Company has adopted this standard as of January 1, 2021, which did not have a material impact on its condensed consolidated financial statements upon the adoption. Debt In August 2020, ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) was issued which simplifies the accounting for convertible instruments. The guidance removes certain accounting models which separate conversion features from the host contract for convertible instruments. Either a modified retrospective method of transition or a fully retrospective method of transition is permissible for the adoption of this standard. Update No. 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted no earlier than the fiscal year beginning after December 15, 2020. The Company has adopted this standard as of January 1, 2021 using the modified retrospective approach. As a result of the adoption of ASU 2020-06, the Convertible Notes due May 2027 are no longer bifurcated into separate liability and equity components in the March 31, 2021 condensed consolidated balance sheet. Rather, the $287.5 million principal amount of the Company’s Convertible Notes was classified only as a liability in the March 31, 2021 condensed consolidated balance sheet. Upon adoption of ASU 2020-06, an adjustment was recorded to the Convertible Notes liability component, equity component (additional paid-in-capital) and retained earnings. The cumulative effect of the change was recognized as an adjustment to the opening balance of retained earnings at the date of adoption. The comparative information has not been restated and continues to be presented according to accounting standards in effect for those periods. This adjustment was calculated based on the carrying amount of the Convertible Notes as if it had always been treated only as a liability. Further, an adjustment was recorded to the debt discount and issuance costs as if these had always been treated as a contra liability only. Interest expense related to the accretion of the Convertible Notes is no longer recognized. Interest expense for the Convertible Notes for the three months ended March 31, 2021 would have been $2.3 million higher without the adoption of ASU 2020-06. As such, net loss from continuing operations attributable to the Company per common share for the three months ended March 31, 2021 is $0.03 lower due to the effect of adoption of ASU 2020-06. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | December 31, | ​ | ASU 2020-06 | ​ | January 1,
​ | 2020 | ​ | Adoption Adjustment | ​ | 2021
​ | (in thousands)
Liabilities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding Principal | $ | 287,500 | ​ | $ | — | ​ | $ | 287,500
Unamortized debt discount and issuance cost | ​ | (85,007) | ​ | ​ | 76,674 | ​ | ​ | (8,333)
Net carrying amount | $ | 202,493 | ​ | $ | 76,674 | ​ | $ | 279,167
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Additional paid-in-capital | $ | (1,411,286) | ​ | $ | 82,872 | ​ | $ | (1,328,414)
Accumulated deficit | ​ | (929,318) | ​ | ​ | 6,198 | ​ | ​ | (923,120)
​ New Accounting Pronouncements Not Yet Adopted In March 2020, ASU 2020-04, Reference Rate Reform (Topic 848) was issued which provides temporary optional guidance to ease the potential burden in accounting for reference rate reform. The new guidance provides optional expedients and exceptions for applying generally accepted accounting principles to transactions affected by reference rate reform if certain criteria are met. These transactions include contract modifications, hedging relationship, and sale or transfer of debt securities classified as HTM. Early adoption of this ASU is permitted, and the Company may elect to apply the amendments prospectively through December 31, 2022. The Company’s financial instruments that are in the scope of ASU 2020-04 include but are not limited to the UBS credit line agreement. The Company is currently evaluating the impact of the adoption of this standard on its consolidated financial statements.

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