Income Taxes (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Current provision (benefit):
Federal			$ (3,440)	$ 244,794	$ 77,244
State			5,239	3,082	(2,930)
Total current provision (benefit)			1,799	247,876	74,314
Deferred provision (benefit):
Federal			61,799		493,989
State			53	44	27
Total deferred provision (benefit)			61,852	44	494,016
Total current and deferred provision (benefit)			$ 63,651	$ 247,920	$ 568,330
Reconciliation of the statutory federal rate to the Company's effective income tax rate
U.S. Federal statutory tax rate (as a percent)	34.00%	21.00%	24.30%	34.00%	34.00%
Rate change due to tax reform (as a percent)			(9.00%)
State income taxes, net of federal benefit (as a percent)			1.90%	(0.40%)	0.20%
Permanent items (as a percent)			(0.10%)	0.20%	(0.20%)
Research and development tax credits (as a percent)			1.30%	8.10%	(12.60%)
Valuation allowance (as a percent)			(20.30%)	(35.90%)	(2.90%)
Change in unrecognized tax benefits (as a percent)			0.90%	(0.90%)	(0.10%)
123R cancellations and forfeitures			(0.80%)	0.10%	3.80%
Effective income tax rate (as a percent)			(1.80%)	5.20%	22.30%