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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
2025 Notes | Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | $ 5,271 | $ 3,434 |
Amortization of debt discount | 829 | 552 |
Amortization of debt issuance costs | 660 | 439 |
Total interest expense | $ 6,760 | 4,425 |
2022 Notes | Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense |  | 768 | $ 5,782
Amortization of debt discount |  | 1,952 | 7,821
Amortization of debt issuance costs |  | 111 | 459
Total interest expense |  | 2,831 | 14,062
Term Loan | Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense |  | 1,667 | 4,789
Amortization of debt discount |  | 859 | 1,331
Amortization of debt issuance costs |  | 103 | 161
Total interest expense |  | $ 2,629 | $ 6,281

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: 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=124435984&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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