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Borrowings - Summary of Carrying Amount of Borrowings (Detail) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Senior convertible notes		$ 223,944
Mann Group promissory notes	[1]	18,425	$ 63,027
Total debt — net carrying amount		281,202	122,235
2024 Convertible Notes
Debt Instrument [Line Items]
Senior convertible notes			5,000
PPP Loan
Debt Instrument [Line Items]
PPP Loan			4,873
MidCap Credit Facility
Debt Instrument [Line Items]
Credit Facility		$ 38,833	$ 49,335
[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 consolidated statement of operations for the year ended December 31, 2021 and was recognized as additional paid-in capital in the consolidated balance sheet as of December 31, 2021. The accounting for the $22.1 million loss on extinguishment did not result in a change in the financial position of the Company.

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