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v3.21.2

Debt (Narrative) (Details) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 18, 2020 USD ($) $ / shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 01, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of convertible debt |  |  |  |  | $ 100,000,000 |  |  |
Adoption adjustment long-term debt |  | $ 309,405,000 |  | $ 309,405,000 |  |  | $ 291,663,000 |
Interest expense |  | 4,100,000 | $ 4,900,000 | 13,000,000.0 | 12,000,000.0 |  |  |
Debt issuance costs |  |  |  | $ 2,219,000 | 3,647,000 |  |  |
Revolving credit facility, percentage repaid for no covenants |  |  |  | 25.00% |  |  |  |
Interest Expense [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 361,000 |  |  |  |
Debt extinguishment costs |  |  |  | $ 474,000 |  |  |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Face value | $ 100,000,000.0 |  |  |  |  |  |  |
Interest rate on amounts borrowed | 4.25% |  |  |  |  |  |  |
Maturity date |  |  |  | Jul. 01, 2025 |  |  |  |
Proceeds from issuance of convertible debt | $ 96,500,000 |  |  |  |  |  |  |
Conversion ratio | 42.6203 |  |  |  |  |  |  |
Conversion principle amount | $ 1,000 |  |  |  |  |  |  |
Conversion price | $ / shares | $ 23.46 |  |  |  |  |  |  |
Debt fair value |  | $ 124,200,000 |  | $ 124,200,000 |  |  |  |
Effective interest rate |  | 5.05% |  | 5.05% |  |  |  |
Interest expense |  | $ 1,200,000 | $ 2,000,000.0 | $ 3,700,000 | $ 2,200,000 |  |  |
Unamortized debt issuance costs |  | $ 2,700,000 |  | $ 2,700,000 |  |  |  |
Convertible Senior Notes [Member] | Circumstance I [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Conversion trading day threshold | item |  |  |  | 20 |  |  |  |
Conversion consecutive trading day threshold | item |  |  |  | 30 |  |  |  |
Conversion percentage of stock price threshold |  |  |  | 130.00% |  |  |  |
Convertible Senior Notes [Member] | Circumstance II [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Conversion principle amount |  |  |  | $ 1,000 |  |  |  |
Conversion trading day threshold | item |  |  |  | 5 |  |  |  |
Conversion consecutive trading day threshold | item |  |  |  | 5 |  |  |  |
Conversion percentage of stock price threshold |  |  |  | 98.00% |  |  |  |
Convertible Senior Notes [Member] | Circumstance After July 5, 2023 [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Conversion trading day threshold | item |  |  |  | 20 |  |  |  |
Conversion consecutive trading day threshold | item |  |  |  | 30 |  |  |  |
Conversion percentage of stock price threshold |  |  |  | 130.00% |  |  |  |
Conversion percentage of principal amount |  |  |  | 100.00% |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  |  |  | $ 30,000,000.0
Secured Debt [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  |  |  | $ 255,000,000.0
Term Loan [Member] | Amended Credit Agreement Two [Member] | Circumstance I [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, extension circumstance period |  |  |  | 91 days |  |  |  |
Term Loan [Member] | Amended Credit Agreement Two [Member] | Circumstance II [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, extension circumstance period |  |  |  | 182 days |  |  |  |
Term Loan [Member] | Base Rate [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 2.25% |  |  |  |
Term Loan [Member] | Base Rate [Member] | Amended Credit Agreement Two [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 2.50% |  |  |  |
Term Loan [Member] | LIBOR [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 3.25% |  |  |  |
Term Loan [Member] | LIBOR [Member] | Amended Credit Agreement Two [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 3.50% |  |  |  |
Revolving Credit Facility And Term Loan [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 2,100,000 |  |  |  |
Amortization of the debt issuance costs |  |  |  | $ 1,800,000 |  |  |  |
Revolving Credit Facility And Term Loan [Member] | Amended Credit Agreement Two [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Debt instrument, extension period |  |  |  | 2 years 6 months |  |  |  |
Revolving Credit Facility And Term Loan [Member] | Convertible Senior Notes [Member] | Amended Credit Agreement Two [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate on amounts borrowed |  | 4.25% |  | 4.25% |  |  |  |
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Adoption adjustment long-term debt |  |  |  |  |  | $ 20,400,000 |  |
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Convertible Senior Notes [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Adoption adjustment long-term debt |  |  |  |  |  | $ 100,000,000.0 |  |

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