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Borrowings - Schedule of Line of Credit Facility Debt and Key Terms (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Amount Due	$ 120.3
Convertible Promissory Note | The Mann Group LLC
Debt Instrument [Line Items]
Amount Due	35.0	$ 71.5
Accrued interest paid-in-kind	$ 1.0	$ 6.8
Annual interest rate	7.00%	5.84%
Maturity date	Nov. 30, 2024	Jul. 31, 2021
Conversion price	$ 2.50	$ 4.00
Non-Convertible Promissory Note | The Mann Group LLC
Debt Instrument [Line Items]
Amount Due	$ 35.1
Accrued interest paid-in-kind	$ 1.0
Annual interest rate	7.00%
Maturity date	Nov. 30, 2024
June 2020 Note
Debt Instrument [Line Items]
Amount Due	$ 2.6
Maturity date	Jun. 30, 2020
5.75% 2024 Convertible Notes
Debt Instrument [Line Items]
Amount Due	$ 5.0	$ 18.7
Annual interest rate	5.75%	5.75%
Maturity date	Nov. 30, 2024	Oct. 31, 2021
Conversion price	$ 3.00	$ 5.15
December 2020 Note
Debt Instrument [Line Items]
Amount Due	$ 2.6
Maturity date	Dec. 31, 2020
MidCap Credit Facility
Debt Instrument [Line Items]
Amount Due	$ 40.0
Maturity date	Aug. 31, 2024
MidCap Credit Facility | LIBOR
Debt Instrument [Line Items]
Annual interest rate	6.75%
Interest rate floor	2.00%
Deerfield Credit Facility | 9.75% Credit Facility Due July 2019
Debt Instrument [Line Items]
Amount Due		$ 4.0
Annual interest rate		9.75%
Maturity date		Jul. 31, 2019
Deerfield Credit Facility | 9.75% Credit Facility Due August 2019
Debt Instrument [Line Items]
Amount Due		$ 5.0
Annual interest rate		9.75%
Maturity date		Aug. 31, 2019
Deerfield Credit Facility | 8.75% Credit Facility Due May 2019
Debt Instrument [Line Items]
Amount Due		$ 2.5
Annual interest rate		8.75%
Maturity date		May 31, 2019

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