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Stock Options - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
Stock Options - Narrative (Details) - USD ($)	Mar. 31, 2019	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2018
Stock Options
Weighted average grant date price per share			$ 11.88	$ 9.82
Exercise of stock options to purchase shares of common stock (in shares)			32,325
Proceeds from stock options exercised			$ 141,327
Intrinsic value of options exercised			35,197
Intrinsic value of options outstanding			196,086
Intrinsic value of options exercisable			$ 4,597,593
Weighted average remaining contractual term of options outstanding			8 years 2 months 5 days
Weighted average remaining contractual term of options exercisable			8 years 11 days
Stock based compensation expense for employee stock option awards			$ 2,539,294	$ 1,725,501
Total unrecognized compensation cost			$ 8,854,490
Stock based compensation expense, weighted average period			2 years 10 months 10 days
Cumulative proceeds collected pursuant to the ESPP			$ 3,433
Stock Options.
Stock Options
Remaining vesting period			4 years
Stock Options. \| Separation Agreement
Stock Options
Number of options outstanding in which vesting period was extended	127,576	127,576
Vesting period extension		1 month
Stock Options. \| Separation Agreement \| Former President and CFO
Stock Options
Acceleration of vesting			30,545
Acceleration vesting period			6 months
Remaining vesting period			12 months
Additional stock option expense			$ 30,566
Restricted Stock Units \| 2016 Plan
Stock Options
Shares approved by board					127,576
Weighted average fair value (in dollars per share)			$ 10.78
Remaining vesting period			4 years
Restricted Stock Units \| Separation Agreement \| Former President and CFO
Stock Options
Vested during period (in shares)	2,658