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Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2020
Apr. 10, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Amount Due $ 122.6    
MidCap Credit Facility      
Debt Instrument [Line Items]      
Amount Due $ 40.0   $ 40.0
Maturity date 2024-08    
MidCap Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Annual interest rate 6.75%    
Interest rate floor 2.00%    
5.75% 2024 Convertible Note      
Debt Instrument [Line Items]      
Amount Due $ 5.0   5.0
Annual interest rate 5.75%    
Maturity date 2024-11    
Conversion price $ 3.00    
June 2020 Note      
Debt Instrument [Line Items]      
Amount Due     2.6
Maturity date 2020-06    
December 2020 Note      
Debt Instrument [Line Items]      
Amount Due $ 2.6   2.6
Maturity date 2020-12    
PPP Loan      
Debt Instrument [Line Items]      
Amount Due $ 4.9    
Annual interest rate 0.98% 0.98%  
Maturity date 2022-04    
The Mann Group L L C | Convertible Promissory Note      
Debt Instrument [Line Items]      
Amount Due $ 35.0   35.0
Accrued interest paid-in-kind $ 2.3   1.0
Annual interest rate 7.00%    
Maturity date 2024-11    
Conversion price $ 2.50    
The Mann Group L L C | Non Convertible Promissory Note      
Debt Instrument [Line Items]      
Amount Due $ 35.1   35.1
Accrued interest paid-in-kind $ 2.3   $ 1.0
Annual interest rate 7.00%    
Maturity date 2024-11