Mezzanine and Stockholders' Equity - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Shares
Options exercised (in shares)	(203,524)	(366,454)
Weighted Average Remaining Contractual Term
Options outstanding	5 years
Allied Pacific of California
Shares
Options outstanding, beginning balance (in shares)	853,800
Options granted (in shares)	0
Options exercised (in shares)	0
Options expired/forfeited (in shares)	0
Options outstanding, ending balance (in shares)	853,800		853,800
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 0.167
Options granted (in dollars per share)	0.000
Options exercised (in dollars per share)	0.000
Options expired/forfeited (in dollars per share)	0.000
Options outstanding, ending balance (in dollars per share)	$ 0.167		$ 0.167
Weighted Average Remaining Contractual Term
Options outstanding	0 days		9 months
Aggregate Intrinsic Value
Beginning balance	$ 0.5
Ending balance	$ 0.5		$ 0.5
Employee Stock Option
Shares
Options outstanding, beginning balance (in shares)	647,240
Options granted (in shares)	123,378
Options exercised (in shares)	(203,524)
Options expired/forfeited (in shares)	0
Options outstanding, ending balance (in shares)	567,094		647,240
Options exercisable (in shares)	466,216
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 5.62
Options granted (in dollars per share)	17.80
Options exercised (in dollars per share)	5.77
Options outstanding, ending balance (in dollars per share)	8.22		$ 5.62
Options exercisable (in dollars per share)	$ 5.07
Weighted Average Remaining Contractual Term
Options outstanding	3 years 7 months 6 days		4 years 1 month 17 days
Options exercisable	2 years 8 months 26 days
Aggregate Intrinsic Value
Beginning balance	$ 9.2
Options exercised	2.4
Ending balance	5.4		$ 9.2
Options exercisable	$ 5.3