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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 18, 2020
USD ($)
$ / shares
Apr. 29, 2020
USD ($)
Jun. 30, 2015
Mar. 31, 2021
USD ($)
item
Mar. 31, 2020
USD ($)
Sep. 30, 2018
Jan. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 01, 2017
USD ($)
Line of Credit Facility [Line Items]                  
Credit facility default interest rate       2.00%          
Credit facility aggregate interest rate       4.25%          
Credit facility commitment fee percentage       0.50%          
Adoption adjustment long-term debt       $ 311,232,000       $ 291,663,000  
Interest expense       $ 4,000,000 $ 3,000,000        
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]                  
Interest rate on amounts borrowed     2.45%            
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]                  
Line of Credit Facility [Line Items]                  
Interest rate on amounts borrowed     1.40%            
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                
Interest expense       $ 1,200,000          
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
Credit facility maturity date       Dec. 01, 2022          
Credit facility outstanding balance         $ 30,000,000.0        
Maximum percentage allowed for total principal amount of loans       25.00%          
Credit facility aggregate interest rate         5.20%        
Credit facility repayments       $ 30,000,000.0          
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]                  
Credit facility maturity date       Dec. 01, 2024          
Term Loan [Member] | Base Rate [Member]                  
Line of Credit Facility [Line Items]                  
Credit facility margin       2.25%   3.00%      
Term Loan [Member] | LIBOR [Member]                  
Line of Credit Facility [Line Items]                  
Credit facility margin       3.25%   4.00%      
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