Stockholder's Equity - Schedule of Pre-2017 Non-Qualified Stock Options Outstanding (Details) - Pre-2017 Non-Qualified Stock Options - USD ($)	5 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Number of Shares
Outstanding at beginning of period (in shares)	3,770,000	2,980,500	4,635,000
Granted (in shares)			320,000
Exercised (in shares)	(217,500)	(95,000)
Expired (in shares)			(5,000)
Forfeited (in shares)	(572,000)	0	(1,180,000)
Outstanding at end of period (in shares)	2,980,500	2,885,500	3,770,000	4,635,000
Exercisable (in shares)		2,747,150
Weighted- average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 8.13	$ 7.33	$ 8.79
Granted (in dollars per share)			9.38
Expired (in dollars per share)			10.00
Exercised (in dollars per share)	10.22	8.24
Forfeited (in dollars per share)	11.51	0.00	11.03
Outstanding at end of period (in dollars per share)	$ 7.33	7.30	$ 8.13	$ 8.79
Exercisable (in dollars per share)		$ 7.20
Weighted- average Remaining Contractual Term (years)
Outstanding	7 years 22 days	6 years 15 days	6 years 10 months 13 days	7 years 4 months 21 days
Exercisable		6 years 4 days
Aggregate Intrinsic Value (in Thousands)
Outstanding	$ 46,606,210	$ 20,633,100	$ 19,139,625	$ 2,731,250
Exercisable		$ 19,928,663