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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	9 Months Ended
	Sep. 30, 2020 USD ($)
Mann Group Promissory Notes | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	26.5
Note payable to related party, fair value	$ 63.7
Note payable to related party, fair value after change	62.4
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	(2.00%)
Mann Group Promissory Notes | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	24.5
Note payable to related party, fair value	$ 63.7
Note payable to related party, fair value after change	65.0
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	2.00%
Mann Group Promissory Notes | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	27.5
Note payable to related party, fair value	$ 63.7
Note payable to related party, fair value after change	61.2
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	(3.90%)
Mann Group Promissory Notes | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	23.5
Note payable to related party, fair value	$ 63.7
Note payable to related party, fair value after change	66.4
Change in fair value of note payable value due to change in interest rate percentage	$ 2.7
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	4.20%
Senior Notes | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	26.5
Note payable to related party, fair value	$ 7.1
Note payable to related party, fair value after change	7.0
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	25.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	24.5
Note payable to related party, fair value	$ 7.1
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	$ 0.1
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	25.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	27.5
Note payable to related party, fair value	$ 7.1
Note payable to related party, fair value after change	7.0
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 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	25.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	23.5
Note payable to related party, fair value	$ 7.1
Note payable to related party, fair value after change	7.3
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	2.80%
MidCap Credit Facility | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	12.0
Note payable to related party, fair value	$ 41.2
Note payable to related party, fair value after change	40.4
Change in fair value of note payable value due to change in interest rate percentage	$ (0.8)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(1.90%)
MidCap Credit Facility | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	10.0
Note payable to related party, fair value	$ 41.2
Note payable to related party, fair value after change	42.0
Change in fair value of note payable value due to change in interest rate percentage	$ 0.8
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	1.90%
MidCap Credit Facility | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	13.0
Note payable to related party, fair value	$ 41.2
Note payable to related party, fair value after change	39.6
Change in fair value of note payable value due to change in interest rate percentage	$ (1.6)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(3.90%)
MidCap Credit Facility | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	9.0
Note payable to related party, fair value	$ 41.2
Note payable to related party, fair value after change	42.9
Change in fair value of note payable value due to change in interest rate percentage	$ 1.7
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	4.10%
PPP Loan | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	12.0
Note payable to related party, fair value	$ 4.6
Note payable to related party, fair value after change	$ 4.6
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	0.00%
PPP Loan | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	10.0
Note payable to related party, fair value	$ 4.6
Note payable to related party, fair value after change	$ 4.6
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	0.00%
PPP Loan | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	13.0
Note payable to related party, fair value	$ 4.6
Note payable to related party, fair value after change	$ 4.6
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	0.00%
PPP Loan | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	11.0
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	9.0
Note payable to related party, fair value	$ 4.6
Note payable to related party, fair value after change	4.7
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	2.20%

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Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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