Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2022	Dec. 31, 2021	Mar. 04, 2021
Debt Instrument [Line Items]
Amount Due		$ 288.4
Senior Convertible Notes
Debt Instrument [Line Items]
Amount Due		$ 230.0	$ 230.0
Annual interest rate		2.50%
Maturity date		2026-03
Conversion price		$ 5.21		$ 5.21
MidCap Credit Facility
Debt Instrument [Line Items]
Amount Due	[1]	$ 40.0	40.0
Maturity date	[1]	2025-08
MidCap Credit Facility | LIBOR
Debt Instrument [Line Items]
Annual interest rate	[1]	6.25%
Interest rate floor	[1]	1.00%
Mann Group | Convertible Promissory Note
Debt Instrument [Line Items]
Amount Due		$ 18.4	18.4
Accrued interest paid-in-kind		$ 0.5	$ 0.4
Annual interest rate	[2]	2.50%
Maturity date	[2]	2025-12
Conversion price		$ 2.50

[1] In April 2021, the Company prepaid $10.0 million principal balance and amended the MidCap credit facility. The interest rate prior to the amendment was one-month LIBOR (2% floor) plus 6.75% and the maturity date was in August 2024.

[2] In April 2021, the Mann Group convertible note was amended. The interest rate prior to the amendment was 7.00% and the maturity date was in November 2024.