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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 18, 2020
USD ($)
$ / shares
Apr. 29, 2020
USD ($)
Jun. 30, 2015
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
Sep. 30, 2018
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 01, 2017
USD ($)
Line of Credit Facility [Line Items]                      
Term loan balance       $ 299,568,000   $ 299,568,000       $ 223,176,000  
Restricted cash and cash equivalents       $ 11,972,000   $ 11,972,000       2,000,000  
Credit facility default interest rate       2.00%   2.00%          
Credit facility aggregate interest rate       4.25%   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       $ 3,700,000 $ 3,800,000 7,000,000.0 $ 7,700,000        
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       933,000   933,000       1,061,000  
Interest rate on amounts borrowed     2.45%                
1.40% Sparkasse Zollernalb (KFW Loan 2) [Member]                      
Line of Credit Facility [Line Items]                      
Term loan balance       1,470,000   $ 1,470,000       1,615,000  
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                    
Conversion feature       $ 16,400,000              
Effective interest rate       4.25%   4.25%          
Contractual coupon interest       $ 156,000              
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       77,790,000   $ 77,790,000          
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]                      
Term loan balance       $ 219,375,000   $ 219,375,000       $ 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           2.25%   3.00%      
Term Loan [Member] | LIBOR [Member]                      
Line of Credit Facility [Line Items]                      
Credit facility margin           3.25%   4.00%