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Fair Value of Financial Instruments - Fair Value of Financial Instruments (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
MidCap Credit Facility
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	10
Note payable, percentage of interest rate increases (decreases)	2.00%
Financial liabilities fair value	$ 52.7	$ 55.4
MidCap Credit Facility | Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	49.4	49.3
MidCap Credit Facility | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	50.7
MidCap Credit Facility | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 54.8
Mann Group Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	14
Note payable, percentage of interest rate increases (decreases)	2.00%
Mann Group Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 41.3
Mann Group Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 43.2
Mann Group Non-Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	14
Note payable, percentage of interest rate increases (decreases)	2.00%
Mann Group Non-Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 29.6
Mann Group Non-Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 33.6
PPP Loan
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	10
Note payable, percentage of interest rate increases (decreases)	2.00%
PPP Loan | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 4.8
PPP Loan | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 4.8
Senior Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of hypothetical yield	14
Note payable, percentage of interest rate increases (decreases)	2.00%
Financial liabilities fair value	$ 209.7
Senior Convertible Notes | Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	222.9
Senior Convertible Notes | Minimum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	199.0
Senior Convertible Notes | Maximum
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	221.6
Mann Group Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	42.2	52.2
Mann Group Convertible Notes | Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	18.4	28.0
Mann Group Non-Convertible Notes
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	31.5	26.7
Mann Group Non-Convertible Notes | Carrying Value
Fair Value Of Financial Instruments [Line Items]
Financial liabilities fair value	$ 35.1	$ 35.1

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