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Indebtedness, net (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2021
USD ($)
day
$ / shares
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 18, 2021
USD ($)
Debt Instrument [Line Items]              
Gain (loss) recognized on loans           $ 0  
Amortization of principal amortization   $ 1,000,000.0   $ 2,400,000      
Net proceeds from long-term debt       $ 83,231,000 $ 109,317,000    
Convertible senior notes | Convertible Senior Notes              
Debt Instrument [Line Items]              
Face amount of debt $ 86,250,000           $ 86,250,000
Interest rate 4.50% 4.50%   4.50%      
Net proceeds from long-term debt $ 82,800,000            
Coupon interest expense   $ 464,000   $ 464,000      
Carrying amount of the equity component 6,300,000            
Initial discount $ 9,300,000            
Discount amortization     $ 185,000 $ 185,000      
Conversion rate 0.1577909            
Conversion price (in dollars per share) | $ / shares $ 6.34            
Threshold percentage of stock price trigger 130.00%            
Threshold trading days | day 20            
Threshold consecutive trading days | day 30            
Redemption price, percentage 100.00%            
Convertible senior notes | Convertible Senior Notes | Discount rate              
Debt Instrument [Line Items]              
Debt instrument, measurement input 0.071