Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2021
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Restatement As previously disclosed in the Explanatory Note to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “2020 10-K”), the Company restated its previously issued audited consolidated financial statements as of and for the years ended December 31, 2019 and 2018 and its unaudited quarterly consolidated financial statements as of and for each of the quarterly periods ended March 31, 2020 and 2019, June 30, 2020 and 2019, September 30, 2020 and 2019 and December 31, 2019. Previously filed annual reports on Form 10-K and quarterly reports on Form 10-Q for the periods affected by the restatement have not been amended. Accordingly, investors should not rely upon the Company’s previously released financial statements for these periods and any earnings releases or other communications relating to these periods, and, for these periods, investors should rely solely on the financial statements and other financial data for the relevant periods included in the 2020 10-K. Commencing with this quarterly report on Form 10-Q, we will include in our quarterly reports for fiscal 2021 restated results for the corresponding interim periods of fiscal 2020. Principles of Consolidation The unaudited interim condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. Interim Financial Statements The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with U.S. generally accepted accounting principles (“GAAP”), the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year. Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s 2020 10-K. The information presented in the accompanying unaudited interim condensed consolidated balance sheets as of December 31, 2020 has been derived from the Company’s December 31, 2020 audited consolidated financial statements. There have been no changes in our accounting policies from those reported in our 2020 10-K, except for the adoption of Accounting Standards Update (“ASU”) 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40), as described in the Recently Adopted Accounting Guidance section. We have also expanded our accounting policy relating to cash equivalents, and available-for-sale securities as follows: Cash Equivalents The Company considers all highly-liquid debt securities with original maturities of three months or less to be cash equivalents. At March 31, 2021, cash equivalents consist of commercial paper with original maturities of three months or less. Due to their short-term nature, the carrying amounts reported in the unaudited interim condensed consolidated balance sheets approximate the fair value of cash and cash equivalents. Available-for-sale securities Available-for-sale securities is comprised of commercial paper with original maturities greater than three months and corporate bonds. We consider these securities to be available for use in our current year operations, and therefore classify them as current even if we do not dispose of the securities in the following year. Available-for-sale securities are recorded at fair value as of each balance sheet date. As of each balance sheet date, unrealized gains and losses, with the exception of credit related losses, are recorded to Accumulated Other Comprehensive Income. Any credit related losses are recognized as a credit loss allowance on the balance sheet with a corresponding adjustment to operations. Recent Accounting Pronouncements Recently Adopted Accounting Guidance Other than the adoption of the accounting guidance mentioned in our 2020 10-K and ASU 2020-06, there have been no other significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements. On January 1, 2021, we early adopted ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) using the modified retrospective approach. Consequently, the Company’s 3.75% Convertible Senior Notes due 2025, which is referred to herein as the 3.75% Convertible Senior Notes, is now accounted for as a single liability measured at its amortized cost. This accounting change removed the impact of recognizing the equity component of the Company’s convertible notes at issuance and the subsequent accounting impact of additional interest expense from debt discount amortization. Future interest expense of the convertible notes will be lower as a result of adoption of this guidance and net loss per share will be computed using the if-converted method for convertible instruments. The cumulative effect of the accounting change upon adoption on January 1, 2021 increased the carrying amount of the 3.75% Convertible Senior Notes by $120.7 million, reduced accumulated deficit by $9.6 million and reduced additional paid-in capital by $130.2 million. Recent Accounting Guidance Not Yet Effective All issued but not yet effective accounting and reporting standards as of March 31, 2021 are either not applicable to the Company or are not expected to have a material impact on the Company.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2021

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Restatement

As previously disclosed in the Explanatory Note to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “2020 10-K”), the Company restated its previously issued audited consolidated financial statements as of and for the years ended December 31, 2019 and 2018 and its unaudited quarterly consolidated financial statements as of and for each of the quarterly periods ended March 31, 2020 and 2019, June 30, 2020 and 2019, September 30, 2020 and 2019 and December 31, 2019.

Previously filed annual reports on Form 10-K and quarterly reports on Form 10-Q for the periods affected by the restatement have not been amended. Accordingly, investors should not rely upon the Company’s previously released financial statements for these periods and any earnings releases or other communications relating to these periods, and, for these periods, investors should rely solely on the financial statements and other financial data for the relevant periods included in the 2020 10-K. Commencing with this quarterly report on Form 10-Q, we will include in our quarterly reports for fiscal 2021 restated results for the corresponding interim periods of fiscal 2020.

Principles of Consolidation

The unaudited interim condensed consolidated financial statements include the financial statements of the Company and its wholly-owned subsidiaries. Intercompany balances and transactions have been eliminated in consolidation.

Interim Financial Statements

The accompanying unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). In the opinion of management, all adjustments, which consist solely of normal recurring adjustments, necessary to present fairly, in accordance with U.S. generally accepted accounting principles (“GAAP”), the financial position, results of operations and cash flows for all periods presented, have been made. The results of operations for the interim periods presented are not necessarily indicative of the results that may be expected for the full year.

Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto included in the Company’s 2020 10-K.

The information presented in the accompanying unaudited interim condensed consolidated balance sheets as of December 31, 2020 has been derived from the Company’s December 31, 2020 audited consolidated financial statements.

There have been no changes in our accounting policies from those reported in our 2020 10-K, except for the adoption of Accounting Standards Update (“ASU”) 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40), as described in the Recently Adopted Accounting Guidance section. We have also expanded our accounting policy relating to cash equivalents, and available-for-sale securities as follows:

Cash Equivalents

The Company considers all highly-liquid debt securities with original maturities of three months or less to be cash equivalents. At March 31, 2021, cash equivalents consist of commercial paper with original maturities of three months or less. Due to their short-term nature, the carrying amounts reported in the unaudited interim condensed consolidated balance sheets approximate the fair value of cash and cash equivalents.

Available-for-sale securities

Available-for-sale securities is comprised of commercial paper with original maturities greater than three months and corporate bonds. We consider these securities to be available for use in our current year operations, and therefore classify them as current even if we do not dispose of the securities in the following year.

Available-for-sale securities are recorded at fair value as of each balance sheet date. As of each balance sheet date, unrealized gains and losses, with the exception of credit related losses, are recorded to Accumulated Other Comprehensive Income. Any credit related losses are recognized as a credit loss allowance on the balance sheet with a corresponding adjustment to operations.

Recent Accounting Pronouncements

Recently Adopted Accounting Guidance

Other than the adoption of the accounting guidance mentioned in our 2020 10-K and ASU 2020-06, there have been no other significant changes in our reported financial position or results of operations and cash flows resulting from the adoption of new accounting pronouncements.

On January 1, 2021, we early adopted ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40) using the modified retrospective approach. Consequently, the Company’s 3.75% Convertible Senior Notes due 2025, which is referred to herein as the 3.75% Convertible Senior Notes, is now accounted for as a single liability measured at its amortized cost. This accounting change removed the impact of recognizing the equity component of the Company’s convertible notes at issuance and the subsequent accounting impact of additional interest expense from debt discount amortization. Future interest expense of the convertible notes will be lower as a result of adoption of this guidance and net loss per share will be computed using the if-converted method for convertible instruments. The cumulative effect of the accounting change upon adoption on January 1, 2021 increased the carrying amount of the 3.75% Convertible Senior Notes by $120.7 million, reduced accumulated deficit by $9.6 million and reduced additional paid-in capital by $130.2 million.

Recent Accounting Guidance Not Yet Effective

All issued but not yet effective accounting and reporting standards as of March 31, 2021 are either not applicable to the Company or are not expected to have a material impact on the Company.