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Fair Value of Financial Instruments - Fair Value Measurement of Debt Instruments Based on Discounted Cash Flow Model and Sensitive to Change in Yield (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Mann Group Promissory Notes | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	19.0
Note payable to related party, fair value	$ 78.9
Note payable to related party, fair value after change	77.4
Change in fair value of note payable value due to change in interest rate percentage	$ (1.5)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(1.90%)
Mann Group Promissory Notes | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	17.0
Note payable to related party, fair value	$ 78.9
Note payable to related party, fair value after change	80.4
Change in fair value of note payable value due to change in interest rate percentage	$ 1.5
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	1.90%
Mann Group Promissory Notes | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	20.0
Note payable to related party, fair value	$ 78.9
Note payable to related party, fair value after change	76.0
Change in fair value of note payable value due to change in interest rate percentage	$ (2.9)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(3.70%)
Mann Group Promissory Notes | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	16.0
Note payable to related party, fair value	$ 78.9
Note payable to related party, fair value after change	82.0
Change in fair value of note payable value due to change in interest rate percentage	$ 3.1
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	3.90%
Senior Notes | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	19.0
Note payable to related party, fair value	$ 7.0
Note payable to related party, fair value after change	6.9
Change in fair value of note payable value due to change in interest rate percentage	$ (0.1)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(1.40%)
Senior Notes | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	17.0
Note payable to related party, fair value	$ 7.0
Note payable to related party, fair value after change	7.1
Change in fair value of note payable value due to change in interest rate percentage	$ 0.1
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	1.40%
Senior Notes | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	20.0
Note payable to related party, fair value	$ 7.0
Note payable to related party, fair value after change	6.8
Change in fair value of note payable value due to change in interest rate percentage	$ (0.2)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(2.90%)
Senior Notes | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	18.0
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	16.0
Note payable to related party, fair value	$ 7.0
Note payable to related party, fair value after change	7.2
Change in fair value of note payable value due to change in interest rate percentage	$ 0.2
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	2.90%
MidCap Credit Facility | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	7.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	8.5
Note payable to related party, fair value	$ 55.4
Note payable to related party, fair value after change	54.1
Change in fair value of note payable value due to change in interest rate percentage	$ (1.3)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(2.30%)
MidCap Credit Facility | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	7.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	6.5
Note payable to related party, fair value	$ 55.4
Note payable to related party, fair value after change	56.6
Change in fair value of note payable value due to change in interest rate percentage	$ 1.2
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	2.20%
MidCap Credit Facility | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	7.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	9.5
Note payable to related party, fair value	$ 55.4
Note payable to related party, fair value after change	52.9
Change in fair value of note payable value due to change in interest rate percentage	$ (2.5)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(4.50%)
MidCap Credit Facility | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	7.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	5.5
Note payable to related party, fair value	$ 55.4
Note payable to related party, fair value after change	57.9
Change in fair value of note payable value due to change in interest rate percentage	$ 2.5
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	4.50%

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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-Topic 210
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