Stockholder's Equity - Schedule of 2017 Plan Options Outstanding (Details) - 2017 Plan - USD ($) $ / shares in Units, $ in Thousands	5 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Jul. 31, 2017	Sep. 08, 2017
Number of Shares
Outstanding at beginning of period (in shares)	0	174,000	0
Total options authorized (in shares)	400,000
Options granted (in shares)	(214,000)	(196,550)
Expired (in shares)	0	0
Forfeited (in shares)	(40,000)	(27,000)
Options available (in shares)		157,881
Outstanding at end of period (in shares)	174,000	343,550	0
Exercisable (in shares)	0
Weighted- average Exercise Price
Granted (in dollars per share)	$ 37.62	$ 23.26
Forfeited (in dollars per share)	49.93	24.84
Outstanding (in dollars per share)	$ 34.78	$ 28.97
Weighted- average Remaining Contractual Term (years)
Outstanding	9 years 8 months 16 days	8 years 11 months 12 days
Aggregate Intrinsic Value (in Thousands)
Outstanding	$ 14,430	$ 840
Employee Stock Option
Number of Shares
Total options authorized (in shares)				400,000
Aggregate Intrinsic Value (in Thousands)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		101,431