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Debt (Narrative) (Details) |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2021 USD ($) | Jun. 01, 2021 | Jun. 18, 2020 USD ($) $ / shares | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) day | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 01, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  | $ 316,122,000 |  | $ 316,122,000 |  | $ 317,627,000 |
Debt issuance costs |  |  |  |  |  | 0 | $ 2,219,000 |  |
Long-term debt |  |  |  | 308,531,000 |  | 308,531,000 |  | 309,123,000 |
Interest expense |  |  |  | 4,100,000 | $ 4,900,000 | $ 8,000,000 | 8,900,000 |  |
Interest Expense |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt issuance costs | $ 361,000 |  |  |  |  |  |  |  |
Debt extinguishment costs | $ 474,000 |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility, percentage repaid for no covenants |  |  |  |  |  | 25.00% |  |  |
Convertible senior notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on amounts borrowed |  |  | 4.25% |  |  |  |  |  |
Face value |  |  | $ 100,000,000 |  |  |  |  |  |
Proceeds from issuance of convertible debt |  |  | $ 96,500,000 |  |  |  |  |  |
Conversion ratio |  |  | 0.0426203 |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 23.46 |  |  |  |  |  |
Debt fair value |  |  |  | $ 107,000,000 |  | $ 107,000,000 |  |  |
Effective interest rate |  |  |  | 5.05% |  | 5.05% |  |  |
Interest expense |  |  |  | $ 1,200,000 | $ 1,200,000 | $ 2,500,000 | $ 2,400,000 |  |
Unamortized debt issuance costs |  |  |  | 2,200,000 |  | $ 2,200,000 |  |  |
Convertible senior notes | Circumstance I |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  |  |  |  | 20 |  |  |
Conversion consecutive trading day threshold | day |  |  |  |  |  | 30 |  |  |
Conversion percentage of stock price threshold |  |  |  |  |  | 130.00% |  |  |
Convertible senior notes | Circumstance II |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  |  |  |  | 5 |  |  |
Conversion consecutive trading day threshold | day |  |  |  |  |  | 5 |  |  |
Conversion percentage of stock price threshold |  |  |  |  |  | 98.00% |  |  |
Convertible senior notes | Circumstance After July 5, 2023 |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Conversion trading day threshold | day |  |  |  |  |  | 20 |  |  |
Conversion consecutive trading day threshold | day |  |  |  |  |  | 30 |  |  |
Conversion percentage of stock price threshold |  |  |  |  |  | 130.00% |  |  |
Conversion percentage of principal amount |  |  |  |  |  | 100.00% |  |  |
2.45% Sparkasse Zollernalb (KFW Loan 1) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  | $ 403,000 |  | $ 403,000 |  | 566,000 |
Interest rate on amounts borrowed |  |  |  | 2.45% |  | 2.45% |  |  |
1.40% Sparkasse Zollernalb (KFW Loan 2) |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  | $ 844,000 |  | $ 844,000 |  | 1,061,000 |
Interest rate on amounts borrowed |  |  |  | 1.40% |  | 1.40% |  |  |
Secured Debt |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  |  |  |  | $ 255,000,000
Term loan balance |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured term loan facility |  |  |  | $ 214,875,000 |  | $ 214,875,000 |  | $ 216,000,000 | 225,000,000
Term loan balance | Credit Agreement | Circumstance I |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, extension circumstance period | 91 days |  |  |  |  |  |  |  |
Term loan balance | Credit Agreement | Circumstance II |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, extension circumstance period | 182 days |  |  |  |  |  |  |  |
Term loan balance | Base Rate |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  | 2.25% |  |  |  |  |  |  |
Term loan balance | Base Rate | Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin | 2.50% |  |  |  |  |  |  |  |
Term loan balance | LIBOR |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  | 3.25% |  |  |  |  |  |  |
Term loan balance | LIBOR | Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin | 3.50% |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  |  |  |  | $ 30,000,000
Revolving Credit Facility And Term Loan |  |  |  |  |  |  |  |  |
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 | Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument, extension period | 2 years 6 months |  |  |  |  |  |  |  |
Revolving Credit Facility And Term Loan | Convertible senior notes | Credit Agreement |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest rate on amounts borrowed | 4.25% |  |  |  |  |  |  |  |
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment | Convertible senior notes |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |

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