Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2021
Accounting Policies [Abstract]
Recently Adopted Accounting Pronouncements and New Accounting Standards	Recently Adopted Accounting Pronouncements On January 1, 2021, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02 (Topic 842) “Leases” which supersedes the lease recognition requirements in ASC Topic 840, “Leases”. Under ASU No. 2016-02, lessees are required to recognize assets and liabilities on the consolidated balance sheets for most leases and provide enhanced disclosures. For companies that are not emerging growth companies (“EGCs”), the ASU was effective for fiscal years beginning after December 15, 2018. For EGCs, the ASU is effective for fiscal years beginning after December 15, 2021. The Company early adopted the new standard using the modified retrospective method by recording a right-of-use asset of $13.2 million, short-term portion of lease liabilities of $6.3 million and long-term portion of lease liabilities of $7.2 million as of the effective date. Prior periods will not be restated and will continue to be reported under Topic 840 guidance in effect during those periods. The Company applied the package of practical expedients to leases that commenced before the effective date whereby the Company elected to not reassess the following: (i) whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The adoption did not have a material impact on its consolidated statements of operations or its consolidated statements of cash flows. See Note 13, Leases, for further information and disclosures related to the adoption of this standard. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU No. 2019-12”), which is intended to simplify various aspects of the accounting for income taxes. ASU No. 2019-12 removes certain exceptions to the general principles in Topic 740 and clarifies and amends existing guidance to improve consistent application. This standard is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted. The Company has adopted the pronouncement and it did not have a material impact on its consolidated financial statements and related disclosures. New Accounting Standards To be adopted In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses, which was subsequently amended by ASU No. 2018-19 and ASU No. 2019-10, requires the measurement of expected credit losses for financial instruments carried at amortized cost held at the reporting date based on historical experience, current conditions and reasonable forecasts. The updated guidance also amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. In addition, the length of time a security has been in an unrealized loss position will no longer impact the determination of whether a credit loss exists. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The standard is effective for EGCs the fiscal year beginning after December 15, 2022, or December 15, 2021 if we were to lose EGC status in 2021. The Company will continue to assess the possible impact of this standard, but currently does not expect the adoption of this standard will have a significant impact on its consolidated financial statements and its limited history of bad debt expense relating to trade accounts receivable.
Corporate Conversion and Stock Split	Corporate Conversion and Stock Split On October 14, 2020, prior to the issuance of any of our shares of common stock in our initial public offering (the “IPO”), we converted from a Delaware limited liability company to a Delaware corporation. In connection with the corporate conversion, we converted all 1,000 of our outstanding member units into 100,000,000 shares of common stock and then completed a stock split of 1.19994-for-1. The corporate conversion and stock split representing 119,994,467 shares of common stock have been adjusted retroactively for the purposes of calculating basic and diluted earnings per share.
Principles of Consolidation	Principles of Consolidation The condensed consolidated financial statements include the accounts of Array Technologies, Inc. and its Subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.
Use of Estimates	Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates include impairment of goodwill, impairment of long-lived assets, fair value of contingent consideration, allowance for doubtful accounts, reserve for excess or obsolete inventories, valuation of deferred tax assets and warranty reserve. Due to the COVID-19 pandemic, there has been and will continue to be uncertainty and disruption in the global economy and financial markets. Management has made estimates and assumptions taking into consideration certain possible impacts due to COVID-19. These estimates may change, as new events occur, and additional information is obtained. Actual results may differ from previously estimated amounts, and such differences may be material to the condensed consolidated financial statements; however, management believes that these estimates and assumptions provide a reasonable basis for the fair presentation of the consolidated financial statements. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the period they occur.
Impact of COVID-19 Pandemic	Impact of COVID-19 Pandemic In December 2019, a novel strain of coronavirus, SARS-CoV-2, which causes coronavirus disease 2019, or COVID-19, surfaced in Wuhan, China. Since then, COVID-19 has spread to multiple countries, including the United States. On March 11, 2020, the World Health Organization declared COVID-19 a pandemic. Due to economic conditions our industry has seen rapid commodity price increases and strained logistics, causing us to experience temporary decreased margins and thus decreased cash from operations. We have taken, and continue to take, mitigating steps to overcome the economic challenges and, therefore, believe the impact to be temporary, but cannot be certain the timing of when we will achieve better margins. We have sufficient liquidity and financing options available, and we expect to have sufficient liquidity to operate for the next 12 months. The Company has implemented adjustments to its operations designed to keep employees safe and comply with federal, state and local guidelines, including those regarding social distancing. The extent to which COVID19 may further impact the Company’s business, results of operations, financial condition and cash flows will depend on future developments, which are highly uncertain and cannot be predicted with confidence. In response to COVID-19, the United States government has passed legislation and taken other actions to provide financial relief to companies and other organizations affected by the pandemic.
Equity-Based Compensation	Equity-Based Compensation On October 14, 2020, the Company’s 2020 Equity Incentive Plan (the “2020 Plan”) became effective. Under the 2020 Plan, the Company may grant (i) restricted stock units (RSU’s) to its employees and non-employee directors in connection with their service on the board of directors, and (ii) performance stock units (“PSUs”) to certain of its executive officers and members of management. The PSUs contain performance and market conditions. The RSUs are valued at the closing stock price on the date of grant and recognized on a straight-line basis over vesting term. The PSU grants were valued using the Monte Carlo simulation method and the assigned fair value on grant date will be recognized on a straight-line basis over the vesting term of the awards. The probability of the awards meeting the performance related vested conditions is not included in the grant date fair value, but rather will be estimated quarterly and the Company will true-up the expense recognition accordingly upon any probability to vest revision. The Company accounts for forfeitures as they occur. In the case of Class B units (the “Class B Units”) and Class C units (the “Class C Units” and, together with the Class B Units, the “Units”) of the Former Parent granted to certain employees and directors of the Company, the determination of the fair value of equity awards issued to employees of the Company was based upon the underlying share price and a number of assumptions, including volatility, performance period, risk-free interest rate and expected dividends. The Class B Units fully vested upon the completion of the Company’s follow-on offering of its common stock in March 2021 (the “2021 Follow-on Offering”) as it was considered a sale of the Former Parent and the Company recognized the remaining unamortized compensation expense of $6.3 million.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2021

Recently Adopted Accounting Pronouncements and New Accounting Standards

Recently Adopted Accounting Pronouncements

On January 1, 2021, the Company adopted Accounting Standards Update (“ASU”) No. 2016-02 (Topic 842) “Leases” which supersedes the lease recognition requirements in ASC Topic 840, “Leases”. Under ASU No. 2016-02, lessees are required to recognize assets and liabilities on the consolidated balance sheets for most leases and provide enhanced disclosures. For companies that are not emerging growth companies (“EGCs”), the ASU was effective for fiscal years beginning after December 15, 2018. For EGCs, the ASU is effective for fiscal years beginning after December 15, 2021. The Company early adopted the new standard using the modified retrospective method by recording a right-of-use asset of $13.2 million, short-term portion of lease liabilities of $6.3 million and long-term portion of lease liabilities of $7.2 million as of the effective date. Prior periods will not be restated and will continue to be reported under Topic 840 guidance in effect during those periods. The Company applied the package of practical expedients to leases that commenced before the effective date whereby the Company elected to not reassess the following: (i) whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The adoption did not have a material impact on its consolidated statements of

operations or its consolidated statements of cash flows. See Note 13, Leases, for further information and disclosures related to the adoption of this standard.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU No. 2019-12”), which is intended to simplify various aspects of the accounting for income taxes. ASU No. 2019-12 removes certain exceptions to the general principles in Topic 740 and clarifies and amends existing guidance to improve consistent application. This standard is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted. The Company has adopted the pronouncement and it did not have a material impact on its consolidated financial statements and related disclosures.

New Accounting Standards

To be adopted

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses, which was subsequently amended by ASU No. 2018-19 and ASU No. 2019-10, requires the measurement of expected credit losses for financial instruments carried at amortized cost held at the reporting date based on historical experience, current conditions and reasonable forecasts. The updated guidance also amends the current other-than-temporary impairment model for available-for-sale debt securities by requiring the recognition of impairments relating to credit losses through an allowance account and limits the amount of credit loss to the difference between a security’s amortized cost basis and its fair value. In addition, the length of time a security has been in an unrealized loss position will no longer impact the determination of whether a credit loss exists. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The standard is effective for EGCs the fiscal year beginning after December 15, 2022, or December 15, 2021 if we were to lose EGC status in 2021. The Company will continue to assess the possible impact of this standard, but currently does not expect the adoption of this standard will have a significant impact on its consolidated financial statements and its limited history of bad debt expense relating to trade accounts receivable.

Corporate Conversion and Stock Split

On October 14, 2020, prior to the issuance of any of our shares of common stock in our initial public offering (the “IPO”), we converted from a Delaware limited liability company to a Delaware corporation. In connection with the corporate conversion, we converted all 1,000 of our outstanding member units into 100,000,000 shares of common stock and then completed a stock split of 1.19994-for-1. The corporate conversion and stock split representing 119,994,467 shares of common stock have been adjusted retroactively for the purposes of calculating basic and diluted earnings per share.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Array Technologies, Inc. and its Subsidiaries. All intercompany accounts and transactions have been eliminated upon consolidation.

Use of Estimates

Use of Estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Significant estimates include impairment of goodwill, impairment of long-lived assets, fair value of contingent consideration, allowance for doubtful accounts, reserve for excess or obsolete inventories, valuation of deferred tax assets and warranty reserve. Due to the COVID-19 pandemic, there has been and will continue to be uncertainty and disruption in the global economy and financial markets. Management has made estimates and assumptions taking into consideration certain possible impacts due to COVID-19. These estimates may change, as new events occur, and additional information is obtained. Actual results may differ from previously estimated amounts, and such differences may be material to the condensed consolidated financial statements; however, management believes that these estimates and assumptions provide a reasonable basis for the fair presentation of the consolidated financial statements. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the period they occur.

Impact of COVID-19 Pandemic

In December 2019, a novel strain of coronavirus, SARS-CoV-2, which causes coronavirus disease 2019, or COVID-19, surfaced in Wuhan, China. Since then, COVID-19 has spread to multiple countries, including the United States. On March 11, 2020, the World Health Organization declared COVID-19 a pandemic. Due to economic conditions our industry has seen rapid commodity price increases and strained logistics, causing us to experience temporary decreased margins and thus decreased cash from operations. We have taken, and continue to take, mitigating steps to overcome the economic challenges and, therefore, believe the impact to be temporary, but cannot be certain the timing of when we will achieve better margins. We have sufficient

liquidity and financing options available, and we expect to have sufficient liquidity to operate for the next 12 months. The Company has implemented adjustments to its operations designed to keep employees safe and comply with federal, state and local guidelines, including those regarding social distancing. The extent to which COVID19 may further impact the Company’s business, results of operations, financial condition and cash flows will depend on future developments, which are highly uncertain and cannot be predicted with confidence. In response to COVID-19, the United States government has passed legislation and taken other actions to provide financial relief to companies and other organizations affected by the pandemic.

Equity-Based Compensation

On October 14, 2020, the Company’s 2020 Equity Incentive Plan (the “2020 Plan”) became effective. Under the 2020 Plan, the Company may grant (i) restricted stock units (RSU’s) to its employees and non-employee directors in connection with their service on the board of directors, and (ii) performance stock units (“PSUs”) to certain of its executive officers and members of management. The PSUs contain performance and market conditions. The RSUs are valued at the closing stock price on the date of grant and recognized on a straight-line basis over vesting term. The PSU grants were valued using the Monte Carlo simulation method and the assigned fair value on grant date will be recognized on a straight-line basis over the vesting term of the awards. The probability of the awards meeting the performance related vested conditions is not included in the grant date fair value, but rather will be estimated quarterly and the Company will true-up the expense recognition accordingly upon any probability to vest revision. The Company accounts for forfeitures as they occur.

In the case of Class B units (the “Class B Units”) and Class C units (the “Class C Units” and, together with the Class B Units, the “Units”) of the Former Parent granted to certain employees and directors of the Company, the determination of the fair value of equity awards issued to employees of the Company was based upon the underlying share price and a number of assumptions, including volatility, performance period, risk-free interest rate and expected dividends. The Class B Units fully vested upon the completion of the Company’s follow-on offering of its common stock in March 2021 (the “2021 Follow-on Offering”) as it was considered a sale of the Former Parent and the Company recognized the remaining unamortized compensation expense of $6.3 million.