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Subsequent Events (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
May 31, 2020
Subsequent Event [Line Items]            
Capital commitment   $ 18,311,000 $ 102,342,000 $ 32,207,000 $ 18,030,000  
Subsequent Event            
Subsequent Event [Line Items]            
Debt conversion, shares issued (in shares) 776,890          
Subsequent Event | Secondary Offering            
Subsequent Event [Line Items]            
Shares issued (in shares) 6,988,423          
Sale of stock, net proceeds $ 0          
Subsequent Event | Underwriters' option            
Subsequent Event [Line Items]            
Shares issued (in shares) 911,533          
SEI | 9.75% convertible senior notes | Convertible Senior Notes            
Subsequent Event [Line Items]            
Stated interest rate   9.75%       9.75%
SEI | Subsequent Event | 9.75% convertible senior notes | Convertible Senior Notes            
Subsequent Event [Line Items]            
Non-cash issuance of convertible preferred stock relating to the reduction of debt $ 10,500,000          
TEPIVF | Subsequent Event | Class A Members            
Subsequent Event [Line Items]            
Capital commitment $ 10,000,000.0