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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	6 Months Ended
	Jun. 30, 2020 USD ($)
Mann Group Promissory Notes | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	32.5
Note payable to related party, fair value	$ 53.5
Note payable to related party, fair value after change	52.5
Change in fair value of note payable value due to change in interest rate percentage	$ (1.0)
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	31.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	30.5
Note payable to related party, fair value	$ 53.5
Note payable to related party, fair value after change	54.6
Change in fair value of note payable value due to change in interest rate percentage	$ 1.1
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	2.10%
Mann Group Promissory Notes | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	33.5
Note payable to related party, fair value	$ 53.5
Note payable to related party, fair value after change	51.6
Change in fair value of note payable value due to change in interest rate percentage	$ (1.9)
Increase (decrease) in fair value of note payable percentage due to increases (decreases) in interest rate percentage	(3.60%)
Mann Group Promissory Notes | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	29.5
Note payable to related party, fair value	$ 53.5
Note payable to related party, fair value after change	55.6
Change in fair value of note payable value due to change in interest rate percentage	$ 2.1
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	31.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	32.5
Note payable to related party, fair value	$ 6.4
Note payable to related party, fair value after change	6.3
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	(1.60%)
Senior Notes | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	30.5
Note payable to related party, fair value	$ 6.4
Note payable to related party, fair value after change	6.5
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	1.60%
Senior Notes | Note Payable Yield Changes 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	33.5
Note payable to related party, fair value	$ 6.4
Note payable to related party, fair value after change	6.3
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	(1.60%)
Senior Notes | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	31.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	29.5
Note payable to related party, fair value	$ 6.4
Note payable to related party, fair value after change	6.6
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	3.10%
MidCap Credit Facility | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	14.5
Note payable to related party, fair value	$ 39.0
Note payable to related party, fair value after change	38.2
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	(2.10%)
MidCap Credit Facility | Note Payable Yield Changes 2
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	12.5
Note payable to related party, fair value	$ 39.0
Note payable to related party, fair value after change	39.9
Change in fair value of note payable value due to change in interest rate percentage	$ 0.9
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 3
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	15.5
Note payable to related party, fair value	$ 39.0
Note payable to related party, fair value after change	37.5
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	(3.80%)
MidCap Credit Facility | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	11.5
Note payable to related party, fair value	$ 39.0
Note payable to related party, fair value after change	40.7
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	4.40%
PPP Loan | Note Payable Yield Changes 1
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	1.00%
Note payable, percentage of hypothetical yield	14.5
Note payable to related party, fair value	$ 4.4
Note payable to related party, fair value after change	$ 4.4
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	13.5
Note payable, percentage of interest rate increases (decreases)	(1.00%)
Note payable, percentage of hypothetical yield	12.5
Note payable to related party, fair value	$ 4.4
Note payable to related party, fair value after change	$ 4.4
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	13.5
Note payable, percentage of interest rate increases (decreases)	2.00%
Note payable, percentage of hypothetical yield	15.5
Note payable to related party, fair value	$ 4.4
Note payable to related party, fair value after change	4.3
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	(2.30%)
PPP Loan | Note Payable Yield Changes 4
Fair Value Of Financial Instruments [Line Items]
Note payable, percentage of yield	13.5
Note payable, percentage of interest rate increases (decreases)	(2.00%)
Note payable, percentage of hypothetical yield	11.5
Note payable to related party, fair value	$ 4.4
Note payable to related party, fair value after change	4.5
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	2.30%

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