Income Taxes: (Tables)

12 Months Ended

Sep. 30, 2015

Income Taxes:

Schedule of components of income taxes

	For the Fiscal Year Ended September 30,
	2015			2014			2013
Current provision (benefit):
Federal	$	(375,936	)	$	614,729		$	432,211
State	(10,146		)	363			(2,731		)
Total current provision (benefit)	(386,082		)	615,092			429,480
Deferred provision (benefit):
Federal	2,598,050			(857,049		)	(255,154		)
State	91,510			(41,665		)	(54,484		)
Total deferred provision (benefit)	2,689,560			(898,714		)	(309,638		)
Total current and deferred provision (benefit)	$	2,303,478		$	(283,622	)	$	119,842

Schedule of reconciliation of the statutory federal rate to the Company's effective income tax rate

	For the Fiscal Year Ended September 30,
	2015		2014		2013
U.S. Federal statutory tax rate	34.0	%	34.0	%	34.0	%
State income taxes, net of federal benefit	0.0	%	29.6	%	(1.3	)%
Permanent items	(2.5	)%	123.9	%	(2.9	)%
Research and development tax credits	17.4	%	190.4	%	(27.4	)%
Valuation allowance	(111.0	)%	3.9	%	(0.8	)%
Change in unrecognized tax benefits	(2.6	)%	(41.5	)%	4.4	%
Effective income tax rate	(64.7	)%	340.3	%	6.0	%

Schedule of deferred tax assets and liabilities

	As of September 30,
	2015						2014
	Current			Non Current			Current			Non Current
Deferred tax assets:
Reserves and accruals	$	3,181,540		$	139,717		$	2,880,747		$	170,562
Research and development credit	—			1,472,421			396,276			208,384
NOL carryforwards - state	—			1,200,156			5,500			1,237,553
Depreciation	—			(741,736		)	—			(795,050		)
Stock options	—			678,316			—			630,160
Other	—			897			—			4,105
	3,181,540			2,749,771			3,282,523			1,455,714
Less: Valuation allowance	(2,248,041		)	(3,123,487		)	(37,300		)	(1,398,007		)
Total deferred tax assets	933,499			(373,716		)	3,245,223			57,707
Deferred tax liabilities:
Depreciation	—			(133,468		)	—			(132,999		)
Other	—			—			—			—
Total deferred tax liabilities	—			(133,468		)	—			(132,999		)
Net deferred tax asset (liability)	$	933,499		$	(507,184	)	$	3,245,223		$	(75,292	)

Schedule of reconciliation of beginning and ending balances of total amounts of gross unrecognized tax benefits

	For the Fiscal Year Ended September 30,
	2015			2014		2013
Balance at beginning of year	$	526,000		$	492,000	$	403,000
Unrecognized tax benefits related to prior years	—			1,500		—
Unrecognized tax benefits related to current year	125,000			32,500		120,000
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations	(36,000		)	—		(31,000		)
Balance at end of year	$	615,000		$	526,000	$	492,000