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Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 04, 2021	Dec. 31, 2020	Apr. 10, 2020
Debt Instrument [Line Items]
Amount Due	$ 338.4
Senior Convertible Notes
Debt Instrument [Line Items]
Amount Due	$ 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	$ 50.0		$ 50.0
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
Annual interest rate	5.75%
Maturity date	2024-11
Conversion price	$ 3.00
PPP Loan
Debt Instrument [Line Items]
Amount Due	$ 4.9		4.9
Annual interest rate	0.98%			0.98%
Maturity date	2022-04
Mann Group | Convertible Promissory Note
Debt Instrument [Line Items]
Amount Due	$ 18.4		28.0
Accrued interest paid-in-kind	$ 0.5		0.6
Annual interest rate	7.00%
Maturity date	2024-11
Conversion price	$ 2.50
Mann Group | Non Convertible Promissory Note
Debt Instrument [Line Items]
Amount Due	$ 35.1		35.1
Accrued interest paid-in-kind	$ 4.3		$ 3.6
Annual interest rate	7.00%
Maturity date	2024-11

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-SubTopic 20
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