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Borrowings - Summary of Carrying Amount of Principal Borrowings (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Senior convertible notes $ 223,580  
Mann Group promissory notes [1] 18,425 $ 63,027
Total debt — net carrying amount 280,728 122,235
MidCap Credit Facility    
Debt Instrument [Line Items]    
Credit Facility $ 38,723 49,335
PPP Loan    
Debt Instrument [Line Items]    
PPP loan   4,873
2024 Convertible Notes    
Debt Instrument [Line Items]    
Senior convertible notes   $ 5,000
[1] The amendment to the Mann Group convertible note in the second quarter of 2021 resulted in a substantial premium of $22.1 million based on the fair value post modification, which contributed to the loss on extinguishment in the condensed consolidated statement of operations for the nine months ended September 30, 2021 and was recognized as additional paid-in capital in the condensed consolidated balance sheet as of September 30, 2021. The accounting for the $22.1 million loss on extinguishment did not result in a change in the financial position of the Company.