SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Leases — The Company has lease agreements for facilities, warehouses, office space and property and equipment. Effective as of January 1, 2019, at the inception of a contract, the Company determines if the contract is a lease or contains an embedded lease arrangement. Operating leases are included in the operating lease right-of-use asset (“ROU asset”) and operating lease liabilities in the condensed consolidated financial statements. ROU assets, which represent the Company’s right to use the leased assets, and operating lease liabilities, which represent the present value of unpaid lease payments, are both recognized by the Company at the lease commencement date. The Company utilizes its estimated incremental borrowing rate at the lease commencement date to determine the present value of unpaid lease obligations. The rates were estimated primarily using a methodology dependent on the Company’s financial condition, creditworthiness, and availability of certain observable data. In particular, the Company considered its actual cost of borrowing for collateralized loans and its credit rating, along with the corporate bond yield curve in estimating its incremental borrowing rates. ROU assets are recorded as the amount of operating lease liability, adjusted for prepayments, accrued lease payments, initial direct costs, lease incentives, and impairment of the ROU asset. Tenant improvement allowances used to fund leasehold improvements are recognized when earned and reduce the related ROU asset. Tenant improvement allowances are amortized through the ROU asset as a reduction of expense over the term of the lease. Leases may contain rent escalations, however the Company recognizes the lease expense on a straight-line basis over the expected lease term. The Company reviews the terms of any lease renewal options to determine if it is reasonably certain that the renewal options will be exercised. The Company has determined that the expected lease term is typically the minimum non-cancelable period of the lease. The Company has lease agreements that contain both lease and non-lease components, which the Company has elected to account for as a single lease component for all asset classes. Leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheet and are expensed on a straight-line basis over the term of the lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. Stock Based Incentive Compensation — The Company accounts for stock-based incentive compensation expense in accordance with Accounting Standards Codification (“ASC”) Topic 718, Compensation-Stock Compensation (“ASC 718”). Stock-based incentive compensation expense is based on the grant date fair value. The Company estimates the fair value of stock option awards using a Black-Scholes option pricing model and the fair value of restricted stock unit awards using the closing price of the Company’s common stock on the grant date. For awards with a service-based vesting condition, the Company recognizes expense on a straight-line basis over the service period of the award. For awards with performance-based vesting conditions, the Company will recognize expense when it is probable that the performance-based conditions will be met. When the Company determines that it is probable that the performance-based conditions will be met, a cumulative catch-up of expense will be recorded as if the award had been vesting on a straight-line basis from the award date. The award will continue to be expensed on a straight-line basis through the remainder of the vesting period and will be updated if the Company determines that there has been a change in the probability of achieving the performance-based conditions. The Company records the impact of forfeited awards in the period in which the forfeiture occurs. Prior to the Merger, HCI issued incentive units to certain employees of Option Care, who remained employees of the Company following the Merger. In accordance with ASC 718, the Company recognizes compensation expense on a straight-line basis over the shorter of the vesting period of the award or the employee’s expected eligibility date. HC I also issued equity incentive units to certain members of the Option Care Board of Directors, who remained members of the Board of Directors following the Merger. In accordance with ASC Topic 505, Equity Based Payment to Non-Employees, expense was recognized at grant date. See Note 15, Stock-Based Incentive Compensation, for a further discussion of equity incentive plans. Concentrations of Business Risk — The Company generates revenue from managed care contracts and other agreements with commercial third-party payers. Revenue related to the Company’s largest payer was approximately 15% and 13% for the three and nine months ended September 30, 2019, respectively. Revenue related to the Company’s largest payer was approximately 16% and 14% for the three and nine months ended September 30, 2018, respectively. For the three and nine months ended September 30, 2019, approximately 13% and 12%, respectively, of the Company’s revenue was reimbursable through Medicare and Medicaid. For the three and nine months ended September 30, 2018, approximately 11% and 11%, respectively, of the Company’s revenue was reimbursable through Medicare and Medicaid. As of September 30, 2019 and December 31, 2018, respectively, approximately 14% and 13%, respectively, of the Company’s accounts receivable was related to these programs. Governmental programs pay for services based on fee schedules and rates that are determined by the related governmental agency. Laws and regulations pertaining to government programs are complex and subject to interpretation. As a result, there is at least a reasonable possibility that recorded estimates will change in the near term. Concentration of credit risk relating to trade accounts receivable is limited due to the Company’s diversity of patients and payers. For the three and nine months ended September 30, 2019, approximately 69% and 72%, respectively, of the Company’s pharmaceutical and medical supply purchases were from three vendors. For the three and nine months ended September 30, 2018, approximately 75% and 76%, respectively, of the Company’s pharmaceutical and medical supply purchases were from three vendors. Although there are a limited number of suppliers, the Company believes that other vendors could provide similar products on comparable terms. However, a change in suppliers could cause delays in service delivery and possible losses in revenue, which could adversely affect the Company’s financial condition or operating results. Recently-Adopted Accounting Pronouncements — In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases, intended to improve financial reporting about leasing transactions. The new guidance requires entities that lease assets to recognize on their balance sheets the ROU assets and lease liabilities for the rights and obligations created by those leases and to disclose key information about leasing arrangements. ASU 2016-02 is effective for interim and annual periods beginning after December 15, 2018 for public entities and certain not-for-profits. The Company adopted the standard as of January 1, 2019. ASU 2016-02 allows for an optional transition method, which was elected by the Company, and permits the application of the standard as of the effective date without requiring the standard to be applied to the comparative periods presented in the unaudited condensed consolidated financial statements. The Company elected the transition package of three practical expedients allowed by ASU 2016-02, which allows the Company not to reassess prior conclusions about lease identification, lease classification and initial, direct costs. The Company did not elect the practical expedient to use hindsight and, accordingly, the initial lease term did not differ under the new standard versus prior accounting practice. The Company also made a policy election not to apply this standard to any leases with a term of 12 months or less. Adoption of ASU 2016-02 resulted in the Company recording an operating lease liability of $67.0 million and a corresponding ROU asset of $59.9 million in the unaudited condensed consolidated balance sheet as of January 1, 2019. See Note 7, Leases, for further discussion on leases. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The ASU requires that an entity recognizes revenue to depict the transfer of promised goods or services to a customer in an amount that reflects the consideration to which the Company expects to be entitled in exchange for these goods or services. ASU 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017 for public entities and certain not-for-profits. The Company adopted the standard as of January 1, 2018. ASU 2014-09 allows for a modified retrospective approach upon adoption, which was elected by the Company, and permits application of the standard only to contracts that are not completed at the adoption date with no adjustment to the comparative periods presented in the unaudited condensed consolidated financial statements. The Company also elected the practical expedient for the portfolio approach, allowing contracts with similar characteristics and impacts to the financial statements to be evaluated together. ASU 2014-09 requires the Company to recognize revenue as the amount of cash that is ultimately expected to be collected, which resulted in the Company treating its previously-reported provision for doubeful accounts as an implicit price concession and a reduction to revenue. Other than the treatment of bad debt expense, the adoption of this standard did not have a material impact on the Company’s unaudited condensed consolidated financial statements. See Note 4, Revenue, for further discussion on revenue. In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2019-09 modifies when a change to the terms or conditions of share-based payment award must be accounted for as a modification. The new guidance requires modification accounting if the fair value, vesting condition, or the classification of the award is not the same immediately before and after a change to the terms and conditions of the award. The effective date for ASU 2017-09 is for annual or interim periods beginning after December 15, 2017. The Company adopted the standard as of January 1, 2018. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements. Recent Accounting Pronouncements — In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires measurement and recognition of expected credit losses for financial assets held. The Amendments in ASU 2016-13 eliminate the probable threshold for initial recognition of a credit loss in current GAAP and reflect an entity’s current estimate of all expected credit losses. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019, and is to be applied using a modified retrospective transition method. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. Immaterial Error Correction — During the three months ended September 30, 2019, the Company identified prior period misstatements in the recording of other noncurrent liabilities that resulted in an overstatement of goodwill and other noncurrent liabilities in the Company’s consolidated balance sheets. The Company assessed the materiality of these misstatements both quantitatively and qualitatively and determined the correction of these errors to be immaterial to the prior consolidated financial statements taken as a whole. As a result, the Company has corrected the misstatements by decreasing goodwill and other noncurrent liabilities by $6.5 million in the accompanying condensed consolidated financial statements. The misstatements had no impact on net (loss) income or net cash flows from operating, investing, or financing activities in any of the periods presented.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Leases — The Company has lease agreements for facilities, warehouses, office space and property and equipment. Effective as of January 1, 2019, at the inception of a contract, the Company determines if the contract is a lease or contains an embedded lease arrangement. Operating leases are included in the operating lease right-of-use asset (“ROU asset”) and operating lease liabilities in the condensed consolidated financial statements.

ROU assets, which represent the Company’s right to use the leased assets, and operating lease liabilities, which represent the present value of unpaid lease payments, are both recognized by the Company at the lease commencement date. The Company utilizes its estimated incremental borrowing rate at the lease commencement date to determine the present value of unpaid lease obligations. The rates were estimated primarily using a methodology dependent on the Company’s financial condition, creditworthiness, and availability of certain observable data. In particular, the Company considered its actual cost of borrowing for collateralized loans and its credit rating, along with the corporate bond yield curve in estimating its incremental borrowing rates. ROU assets are recorded as the amount of operating lease liability, adjusted for prepayments, accrued lease payments, initial direct costs, lease incentives, and impairment of the ROU asset. Tenant improvement allowances used to fund leasehold improvements are recognized when earned and reduce the related ROU asset. Tenant improvement allowances are amortized through the ROU asset as a reduction of expense over the term of the lease.

Leases may contain rent escalations, however the Company recognizes the lease expense on a straight-line basis over the expected lease term. The Company reviews the terms of any lease renewal options to determine if it is reasonably certain that the renewal options will be exercised. The Company has determined that the expected lease term is typically the minimum non-cancelable period of the lease.

The Company has lease agreements that contain both lease and non-lease components, which the Company has elected to account for as a single lease component for all asset classes. Leases with an initial term of 12 months or less are not recorded on the condensed consolidated balance sheet and are expensed on a straight-line basis over the term of the lease. The Company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants.

Stock Based Incentive Compensation — The Company accounts for stock-based incentive compensation expense in accordance with Accounting Standards Codification (“ASC”) Topic 718, Compensation-Stock Compensation (“ASC 718”). Stock-based incentive compensation expense is based on the grant date fair value. The Company estimates the fair value of stock option awards using a Black-Scholes option pricing model and the fair value of restricted stock unit awards using the closing price of the Company’s common stock on the grant date. For awards with a service-based vesting condition, the Company recognizes expense on a straight-line basis over the service period of the award. For awards with performance-based vesting conditions, the Company will recognize expense when it is probable that the performance-based conditions will be met. When the Company determines that it is probable that the performance-based conditions will be met, a cumulative catch-up of expense will be recorded as if the award had been vesting on a straight-line basis from the award date. The award will continue to be expensed on a straight-line basis through the remainder of the vesting period and will be updated if the Company determines that there has been a change in the probability of achieving the performance-based conditions. The Company records the impact of forfeited awards in the period in which the forfeiture occurs.

Prior to the Merger, HCI issued incentive units to certain employees of Option Care, who remained employees of the Company following the Merger. In accordance with ASC 718, the Company recognizes compensation expense on a straight-line basis over the shorter of the vesting period of the award or the employee’s expected eligibility date. HC I also issued equity incentive units to certain members of the Option Care Board of Directors, who remained members of the Board of Directors following the Merger. In accordance with ASC Topic 505, Equity Based Payment to Non-Employees, expense was recognized at grant date. See Note 15, Stock-Based Incentive Compensation, for a further discussion of equity incentive plans.

Concentrations of Business Risk — The Company generates revenue from managed care contracts and other agreements with commercial third-party payers. Revenue related to the Company’s largest payer was approximately 15% and 13% for the three and nine months ended September 30, 2019, respectively. Revenue related to the Company’s largest payer was approximately 16% and 14% for the three and nine months ended September 30, 2018, respectively. For the three and nine months ended September 30, 2019, approximately 13% and 12%, respectively, of the Company’s revenue was reimbursable through Medicare and Medicaid. For the three and nine months ended September 30, 2018, approximately 11% and 11%, respectively, of the Company’s revenue was reimbursable through Medicare and Medicaid. As of September 30, 2019 and December 31, 2018, respectively, approximately 14% and 13%, respectively, of the Company’s accounts receivable was related to these programs. Governmental programs pay for services based on fee schedules and rates that are determined by the related governmental agency. Laws and regulations pertaining to government programs are complex and subject to interpretation. As a result, there is at least a reasonable possibility that recorded estimates will change in the near term. Concentration of credit risk relating to trade accounts receivable is limited due to the Company’s diversity of patients and payers.

For the three and nine months ended September 30, 2019, approximately 69% and 72%, respectively, of the Company’s pharmaceutical and medical supply purchases were from three vendors. For the three and nine months ended September 30, 2018, approximately 75% and 76%, respectively, of the Company’s pharmaceutical and medical supply purchases were from three vendors. Although there are a limited number of suppliers, the Company believes that other vendors could provide similar products on comparable terms. However, a change in suppliers could cause delays in service delivery and possible losses in revenue, which could adversely affect the Company’s financial condition or operating results.

Recently-Adopted Accounting Pronouncements — In February 2016, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2016-02, Leases, intended to improve financial reporting about leasing transactions. The new guidance requires entities that lease assets to recognize on their balance sheets the ROU assets and lease liabilities for the rights and obligations created by those leases and to disclose key information about leasing arrangements. ASU 2016-02 is effective for interim and annual periods beginning after December 15, 2018 for public entities and certain not-for-profits. The Company adopted the standard as of January 1, 2019. ASU 2016-02 allows for an optional transition method, which was elected by the Company, and permits the application of the standard as of the effective date without requiring the standard to be applied to the comparative periods presented in the unaudited condensed consolidated financial statements. The Company elected the transition package of three practical expedients allowed by ASU 2016-02, which allows the Company not to reassess prior conclusions about lease identification, lease classification and initial, direct costs. The Company did not elect the practical expedient to use hindsight and, accordingly, the initial lease term did not differ under the new standard versus prior accounting practice. The Company also made a policy election not to apply this standard to any leases with a term of 12 months or less. Adoption of ASU 2016-02 resulted in the Company recording an operating lease liability of $67.0 million and a corresponding ROU asset of $59.9 million in the unaudited condensed consolidated balance sheet as of January 1, 2019. See Note 7, Leases, for further discussion on leases.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. The ASU requires that an entity recognizes revenue to depict the transfer of promised goods or services to a customer in an amount that reflects the consideration to which the Company expects to be entitled in exchange for these goods or services. ASU 2014-09 is effective for interim and annual reporting periods beginning after December 15, 2017 for public entities and certain not-for-profits. The Company adopted the standard as of January 1, 2018. ASU 2014-09 allows for a modified retrospective approach upon adoption, which was elected by the Company, and permits application of the standard only to contracts that are not completed at the adoption date with no adjustment to the comparative periods presented in the unaudited condensed consolidated financial statements. The Company also elected the practical expedient for the portfolio approach, allowing contracts with similar characteristics and impacts to the financial statements to be evaluated together. ASU 2014-09 requires the Company to recognize revenue as the amount of cash that is ultimately expected to be collected, which resulted in the Company treating its previously-reported provision for doubeful accounts as an implicit price concession and a reduction to revenue. Other than the treatment of bad debt expense, the adoption of this standard did not have a material impact on the Company’s unaudited condensed consolidated financial statements. See Note 4, Revenue, for further discussion on revenue.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. ASU 2019-09 modifies when a change to the terms or conditions of share-based payment award must be accounted for as a modification. The new guidance requires modification accounting if the fair value, vesting condition, or the classification of the award is not the same immediately before and after a change to the terms and conditions of the award. The effective date for ASU 2017-09 is for annual or interim periods beginning after December 15, 2017. The Company adopted the standard as of January 1, 2018. The adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements — In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which requires measurement and recognition of expected credit losses for financial assets held. The Amendments in ASU 2016-13 eliminate the probable threshold for initial recognition of a credit loss in current GAAP and reflect an entity’s current estimate of all expected credit losses. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019, and is to be applied using a modified retrospective transition method. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements.

Immaterial Error Correction — During the three months ended September 30, 2019, the Company identified prior period misstatements in the recording of other noncurrent liabilities that resulted in an overstatement of goodwill and other noncurrent liabilities in the Company’s consolidated balance sheets. The Company assessed the materiality of these misstatements both quantitatively and qualitatively and determined the correction of these errors to be immaterial to the prior consolidated financial statements taken as a whole. As a result, the Company has corrected the misstatements by decreasing goodwill and other noncurrent liabilities by $6.5 million in the accompanying condensed consolidated financial statements. The misstatements had no impact on net (loss) income or net cash flows from operating, investing, or financing activities in any of the periods presented.