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Debt - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
May 14, 2018
day
$ / shares
Jul. 31, 2017
USD ($)
day
$ / shares
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
May 31, 2018
USD ($)
Debt Instrument [Line Items]              
Principal amount     $ 316,250,000 $ 316,250,000      
Carrying amount     $ 260,632,000 $ 260,632,000 $ 251,229,000 $ 247,886,000  
2024 Convertible Notes              
Debt Instrument [Line Items]              
Stated interest rate   2.875%          
Principal amount   $ 143,750,000          
Effective interest rate     9.00% 9.00%      
2024 Convertible Notes | Common Stock Class A Non-voting              
Debt Instrument [Line Items]              
Conversion rate per $1,000 principal amount   0.1          
Conversion price, per share (in dollars per share) | $ / shares   $ 10.00          
2024 Convertible Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt, gross     $ 39,800,000 $ 39,800,000      
Carrying amount     25,300,000 25,300,000      
2024 Convertible Notes | Senior Notes              
Debt Instrument [Line Items]              
Principal amount     143,750,000 143,750,000      
Carrying amount     121,910,000 121,910,000 117,193,000 115,681,000  
2024 Convertible Notes | Debt Conversion, Condition One | Senior Notes              
Debt Instrument [Line Items]              
Trading days threshold | day   20          
Consecutive trading day threshold | day   30          
2025 Convertible Notes              
Debt Instrument [Line Items]              
Stated interest rate 2.375%           2.375%
Principal amount             $ 172,500,000
2025 Convertible Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt, gross     49,600,000 49,600,000      
2025 Convertible Notes | Senior Notes              
Debt Instrument [Line Items]              
Principal amount     172,500,000 172,500,000      
Carrying amount     $ 138,722,000 $ 138,722,000 $ 133,164,000 $ 131,378,000  
Effective interest rate     9.00% 9.00%      
Conversion rate per $1,000 principal amount 0.0628931            
Conversion price, per share (in dollars per share) | $ / shares $ 15.90            
Share price (in dollars per share) | $ / shares $ 15.90            
2025 Convertible Notes | Senior Notes | Additional Paid-in Capital              
Debt Instrument [Line Items]              
Equity component of debt     $ 39,100,000 $ 39,100,000      
2025 Convertible Notes | Debt Conversion, Condition One | Senior Notes              
Debt Instrument [Line Items]              
Trading days threshold | day 20            
Consecutive trading day threshold | day 30