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v3.20.4

Debt (Narrative) (Details) |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 18, 2020 USD ($) $ / shares | Apr. 29, 2020 USD ($) | Jun. 30, 2015 | Sep. 30, 2018 | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Dec. 01, 2017 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term loan balance |  |  |  |  | $ 300,148,000 | $ 223,176,000 |  |  |
Credit facility default interest rate |  |  |  |  | 2.00% |  |  |  |
Credit facility aggregate interest rate |  |  |  |  | 4.25% |  |  |  |
Credit facility commitment fee percentage |  |  |  |  | 0.50% |  |  |  |
Credit facility repayments |  |  |  |  | $ 30,000,000 |  |  |  |
Proceeds from issuance of convertible debt |  |  |  |  | 100,000,000 |  |  |  |
Interest expense |  |  |  |  | 16,700,000 | 14,900,000 | $ 15,800,000 |  |
Government Sponsored Debt [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Loan term |  |  | 9 years |  |  |  |  |  |
2.45% Sparkasse Zollernalb (KFW Loan 1) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term loan balance |  |  |  |  | $ 886,000 | 1,061,000 |  |  |
Interest rate on amounts borrowed |  |  | 2.45% |  | 2.45% |  |  |  |
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term loan balance |  |  |  |  | $ 1,457,000 | 1,615,000 |  |  |
Interest rate on amounts borrowed |  |  | 1.40% |  | 1.40% |  |  |  |
Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility repayments |  |  |  |  | $ 30,000,000.0 |  |  |  |
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 |  |  |  |  |  |  |  |
Conversion feature |  |  |  |  | $ 16,400,000 |  |  |  |
Conversion, Net of tax |  |  |  |  | 4,700,000 |  |  |  |
Interest expense |  |  |  |  | $ 4,200,000 |  |  |  |
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
Term loan balance |  |  |  |  | $ 79,555,000 |  |  |  |
Credit facility maturity date |  |  |  |  | Dec. 01, 2022 |  |  |  |
Credit facility outstanding balance |  |  |  |  |  |  |  | $ 30,000,000.0 |
Credit facility aggregate interest rate |  |  |  |  |  |  |  | 5.20% |
Credit facility repayments |  |  |  |  | $ 30,000,000.0 |  |  |  |
Line of credit facility, percentage threshold of principal amount outstanding |  |  |  |  | 25.00% |  |  |  |
Revolving Credit Facility [Member] | Amended Credit Agreement [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Maximum percentage allowed for total principal amount of loans |  | 25.00% |  |  |  |  |  |  |
Maximum principal amount of loans outstanding |  | $ 7,500,000 |  |  |  |  |  |  |
First lien net leverage ratio |  | 3.4 |  |  |  |  |  |  |
Minimum liquidity requirement |  | $ 12,000,000.0 |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  |  | 3.00% |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  |  | 4.00% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  |  | 3.25% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  |  | 4.25% |  |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility aggregate commitments |  |  |  |  |  |  |  |  | 255,000,000.0
Credit facility outstanding balance |  |  |  |  |  |  |  |  | 225,000,000.0
Term Loan [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Term loan balance |  |  |  |  | $ 218,250,000 | $ 220,500,000 |  |  | $ 225,000,000.0
Credit facility maturity date |  |  |  |  | Dec. 01, 2024 |  |  |  |
Term Loan [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 3.00% | 2.25% |  |  |  |
Term Loan [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Credit facility margin |  |  |  | 4.00% | 3.25% |  |  |  |

X
- Definition Debt Instrument, Convertible, Net Of Tax + References No definition available. + Details
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X
- Definition Debt Instrument, Convertible, Redemption Percentage Of Principal Amount + References No definition available. + Details
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- Definition Debt instrument, debt default, interest rate in addition if there is a default. + References No definition available. + Details
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- Definition Debt Instrument, First Lien Net Leverage Ratio + References No definition available. + Details
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- Definition Line Of Credit Facility, Maximum Principal Amount Of Loans Outstanding Under Revolving Credit Facility + References No definition available. + Details
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- Definition Line Of Credit Facility, Maximum Threshold Principal Amount Of Loans Outstanding, Percentage + References No definition available. + Details
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- Definition Line of credit facility, percentage threshold of principal amount outstanding. + References No definition available. + Details
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- Definition Minimum Liquidity Covenant Restrictions Requirement + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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X
- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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X
- Definition Amount of a favorable spread to a debt holder between the amount of debt being converted and the value of the securities received upon conversion. This is an embedded conversion feature of convertible debt issued that is in-the-money at the commitment date. + References Reference 1: 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 + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: 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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 3: 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(a)(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: 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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X
- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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 2: 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 + Details
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X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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X
- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: 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=120395209&loc=SL114868664-224227 + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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