Stockholders' Equity - Summary of Option Activity under 2018 Plan, 2013 Plan and 2010 Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Options
Number of Shares, Options outstanding at beginning of period	463,600
Number of Shares, Options Granted	377,500
Number of Shares, Options Exercised	(34,375)
Number of Shares, Options Cancelled/forfeited	(25,000)
Number of Shares, Options outstanding at end of period	781,725	463,600
Number of Shares, Options exercisable at end of period	217,222
Weighted Average Exercise Price, Options
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 11.23
Weighted Average Exercise Price, Options Granted	21.65
Weighted Average Exercise Price, Options Exercised	2.55
Weighted Average Exercise Price, Options Cancelled/forfeited	20.21
Weighted Average Exercise Price, Options outstanding at end of period	16.34	$ 11.23
Weighted Average Exercise Price, Options exercisable at end of period	$ 8.37
Weighted Average Remaining Contract Term, Options
Weighted Average Remaining Contractual Term, Options outstanding at beginning of period	9 years	9 years 6 months
Weighted Average Remaining Contractual Term, Options exercisable at end of period	8 years 1 month 6 days
Aggregate Intrinsic Value, Options Exercised	$ 603,969
Aggregate Intrinsic Value, Options outstanding at end of period	4,109,547
Aggregate Intrinsic Value, Options exercisable at end of period	$ 2,552,337