Mezzanine and Stockholders' Equity - Schedule of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Shares
Options exercised (in shares)	(111,000)	(240,500)
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	3 months		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)	45,000
Options exercised (in shares)	(111,000)
Options expired/forfeited (in shares)	0
Options outstanding, ending balance (in shares)	581,240		647,240
Options exercisable (in shares)	547,490
Weighted Average Exercise Price
Options outstanding, beginning balance (in dollars per share)	$ 5.62
Options granted (in dollars per share)	18.11
Options exercised (in dollars per share)	4.56
Options outstanding, ending balance (in dollars per share)	6.79		$ 5.62
Options exercisable (in dollars per share)	$ 5.74
Weighted Average Remaining Contractual Term
Options outstanding	3 years 5 months 9 days		4 years 1 month 17 days
Options exercisable	3 years 2 months 5 days
Aggregate Intrinsic Value
Beginning balance	$ 9.2
Options exercised	1.4
Ending balance	5.8		$ 9.2
Options exercisable	$ 5.8