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Debt (Tables) | 3 Months Ended
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Mar. 31, 2020
Debt Disclosure [Abstract] |
Summary of Debt Outstanding | Convertible senior notes consist of the following (in thousands):
| March 31, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
4.875% convertible senior notes due 2020 | $ | 1,905 |  |  |  |  |  |  | $ | 1,905 |  |  |  |  |
3.25% convertible senior notes due 2023* | 43,745 |  |  |  |  |  |  | 50,753 |  |  |  |  |
Total convertible senior notes | $ | 45,650 |  |  |  |  |  |  | $ | 52,658 |  |  |  |  |
* The amounts presented for the 3.25% convertible senior notes due 2023 within the table represent the fair value as of March 31, 2020 and December 31, 2019 (see Note 16 - Fair Value Measurements). The principal amount of these notes totaled $37.6 million as of March 31, 2020 and December 31, 2019. Term loan consists of the following (in thousands):
| March 31, 2020 |  |  |  |  |  | December 31, 2019 |  |  |  |
| Principal Amount** |  | Debt Discount/ Issuance Costs* |  | Net Amount |  | Principal Amount** |  | Debt Discount/ Issuance Costs* |  | Net Amount
Term Loan | $ | 134,801 |  |  | $ | (11,364) |  |  | $ | 123,437 |  |  |  | $ | 134,801 |  |  | $ | (12,319) |  |  | $ | 122,482 |
* The term loan was valued using the discounted cash flow method to determine the implied debt discount. The debt discount and issuance costs are being amortized over the life of the term loan. ** The amount presented excludes accrued, but unpaid, payment-in-kind interest of $2.2 million and $1.3 million of March 31, 2020 and December 31, 2019, respectively.

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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=6877327&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=114775744&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=26873400&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=114775744&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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