Share-Based Compensation - Pre-IPO Restricted Stock Plan (Details) - Pre-IPO Restricted Stock Plan [Member] $ / shares in Units, $ in Millions		5 Months Ended	7 Months Ended		12 Months Ended
	Jun. 13, 2018 item $ / shares shares	Jun. 13, 2018 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2018 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Holding period					9 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Unvested, beginning balance (in shares) | shares		446,000	334,026	1,558,787	1,401,674	446,000	237,500
Granted, number of shares (in shares) | shares							292,500
Vested, number of shares (in shares) | shares		(105,307)		(144,667)	(454,893)		(69,333)
Forfeited, number of shares (in shares) | shares		(6,667)		(12,446)	(103,893)		(14,667)
Unvested, ending balance (in shares) | shares	334,026	334,026	1,401,674	1,401,674	842,888	1,401,674	446,000
Conversion factor | item	4.6666667
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested, weighted average, beginning (in dollars per share) | $ / shares		$ 9.14	$ 9.62	$ 2.06	$ 2.00	$ 9.14	$ 6.79
Granted, weighted average grant date fair value (in dollars per share) | $ / shares							10.37
Vested, weighted average grant date fair value (in dollars per share) | $ / shares		7.74		2.67	1.70		6.62
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares		7.52		1.99	2.15		7.69
Unvested, weighted average, ending (in dollars per share) | $ / shares	$ 9.62	$ 9.62	$ 2.00	$ 2.00	$ 2.14	$ 2.00	$ 9.14
Share-based compensation recognized cost | $					$ 0.5	$ 0.9	$ 0.7
Unrecognized amount | $					$ 1.4
Unrecognized cost, period for recognition					3 years 10 months 24 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting period					3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Vesting period					7 years