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Debt (Tables) | 3 Months Ended
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Mar. 31, 2021
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | Further details of the Notes are as follows:
Issuance |  | Maturity Date |  | Interest Rate |  | First Interest Payment Date |  | Effective Interest Rate |  | Semi-Annual Interest Payment Dates |  | Initial Conversion Rate per $1,000 Principal |  | Initial Conversion Price |  | Number of Shares (in millions)
2023 Notes |  | August 1, 2023 |  | 1.25 | % |  | February 1, 2019 |  | 1.86 | % |  | February 1 and August 1 |  | 24.0460 |  | $ | 41.59 |  |  | 1.1 |
2025 Notes |  | May 1, 2025 |  | 2.25 | % |  | November 1, 2020 |  | 2.88 | % |  | May 1 and November 1 |  | 16.3875 |  | $ | 61.02 |  |  | 3.8 |
2027 Notes |  | March 15, 2027 |  | 0.25 | % |  | September 15, 2021 |  | 0.67 | % |  | March 15 and September 15 |  | 9.6734 |  | $ | 103.38 |  |  | 5.8 |
Schedule of Liability and Equity Components of Convertible Debt | As a result of applying the modified retrospective method to adopt this standard, the following adjustments were made to the consolidated balance sheet as of January 1, 2021 (in thousands):
| As Reported |  | Adjustments |  | Adjusted Under ASU 2020-06
| December 31, 2020 |  | Transfer Equity Component of the Debt to Liabilities |  | Reverse Equity Component of Debt Issuance Costs |  | Reverse Debt Discount Amortization |  | Record Debt Issuance Costs Amortization |  | Total |  | January 1, 2021
Liabilities and Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes, net | $ | 378,586 |  |  | $ | 102,166 |  |  | $ | (3,140) |  |  | $ | (28,811) |  |  | $ | 1,226 |  |  | $ | 71,441 |  |  | $ | 450,027 |
Total liabilities | $ | 841,586 |  |  | $ | 102,166 |  |  | $ | (3,140) |  |  | $ | (28,811) |  |  | $ | 1,226 |  |  | $ | 71,441 |  |  | $ | 913,027 |
Stockholders' Equity: |  |  |  |  |  |  |  |  |  |  |  |  |
Additional paid-in capital | $ | 692,603 |  |  | $ | (102,166) |  |  | $ | 3,140 |  |  | $ | — |  |  | $ | — |  |  | $ | (99,026) |  |  | $ | 593,577 |
Accumulated deficit | $ | (617,279) |  |  | $ | — |  |  | $ | — |  |  | $ | 28,811 |  |  | $ | (1,226) |  |  | $ | 27,585 |  |  | $ | (589,694) |
Total stockholders' equity | $ | 71,536 |  |  | $ | (102,166) |  |  | $ | 3,140 |  |  | $ | 28,811 |  |  | $ | (1,226) |  |  | $ | (71,441) |  |  | $ | 95 |
Total liabilities and stockholders' equity | $ | 913,122 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 913,122 |
The net carrying amount of the Notes as of March 31, 2021 and December 31, 2020 was as follows (in thousands):
|  | As of March 31, 2021 |  | As of December 31, 2020
|  | 2023 Notes |  | 2025 Notes |  | 2027 Notes |  | Total |  | 2023 Notes |  | 2025 Notes |  | Total
Principal |  | $ | 47,353 |  |  | $ | 230,000 |  |  | $ | 600,000 |  |  | $ | 877,353 |  |  | $ | 230,000 |  |  | $ | 230,000 |  |  | $ | 460,000 |
Unamortized debt discount |  | — |  |  | — |  |  | — |  |  | — |  |  | (30,425) |  |  | (42,930) |  |  | (73,355) |
Unamortized debt issuance costs |  | (778) |  |  | (5,957) |  |  | (14,909) |  |  | (21,644) |  |  | (3,009) |  |  | (5,050) |  |  | (8,059) |
Net carrying amount |  | $ | 46,575 |  |  | $ | 224,043 |  |  | $ | 585,091 |  |  | $ | 855,709 |  |  | $ | 196,566 |  |  | $ | 182,020 |  |  | $ | 378,586 |
Interest expense related to the Notes was as follows (in thousands):
| Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
| 2023 Notes |  | 2025 Notes |  | 2027 Notes |  | Total |  | 2023 Notes |  | Total
Contractual interest expense | $ | 558 |  |  | $ | 1,294 |  |  | $ | 50 |  |  | $ | 1,902 |  |  | $ | 719 |  |  | $ | 719 |
Amortization of debt discount | — |  |  | — |  |  | — |  |  | — |  |  | 2,496 |  |  | 2,496 |
Amortization of debt issuance costs | 221 |  |  | 319 |  |  | 80 |  |  | 620 |  |  | 247 |  |  | 247 |
Induced conversion expense | 2,740 |  |  | — |  |  | — |  |  | 2,740 |  |  | — |  |  | — |
Total interest expense | $ | 3,519 |  |  | $ | 1,613 |  |  | $ | 130 |  |  | $ | 5,262 |  |  | $ | 3,462 |  |  | $ | 3,462 |

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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