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Income Taxes (Details) - USD ($)	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Current provision (benefit):
Federal	$ 77,244	$ (375,936)	$ 614,729
State	(2,930)	(10,146)	363
Total current provision (benefit)	74,314	(386,082)	615,092
Deferred provision (benefit):
Federal	493,989	2,598,050	(857,049)
State	27	91,510	(41,665)
Total deferred provision (benefit)	494,016	2,689,560	(898,714)
Total current and deferred provision (benefit)	$ 568,330	$ 2,303,478	$ (283,622)
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%	34.00%	34.00%
State income taxes, net of federal benefit (as a percent)	0.20%	0.00%	29.60%
Permanent items (as a percent)	(0.20%)	(2.50%)	123.90%
Research and development tax credits (as a percent)	(12.60%)	17.40%	190.40%
Valuation allowance (as a percent)	(2.90%)	(110.00%)	283.90%
Change in unrecognized tax benefits (as a percent)	(0.10%)	(2.60%)	(41.50%)
123R cancellations and forfeitures	3.80%	(1.00%)	(280.00%)
Effective income tax rate (as a percent)	22.20%	(64.70%)	340.30%

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