Income Taxes: (Tables)

12 Months Ended

Sep. 30, 2012

Income Taxes:

Schedule of components of income taxes

	For the Fiscal Year Ended September 30,
	2012			2011			2010
Current provision (benefit):
Federal	$	46,792		$	183,527		$	(33,770	)
State		(9,476	)		(518	)		(64,243	)
Total current provision (benefit)		37,316			183,009			(98,013	)
Deferred (benefit) provision:
Federal		(2,435,049	)		—			—
State		670			751			(11,081	)
Total deferred (benefit) provision		(2,434,379	)		751			(11,081	)
Total current and deferred (benefit) provision	$	(2,397,063	)	$	183,760		$	(109,094	)

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

	For the Fiscal Year Ended September 30,
	2012			2011			2010
U.S. Federal statutory tax rate		34.0	%		34.0	%		34.0	%
State income taxes, net of federal benefit		6.5	%		(7.1	)%		13.8	%
Permanent items		(1.8	)%		(0.4	)%		1.3	%
Research and development tax credits		(3.6	)%		(27.5	)%		(20.7	)%
Valuation allowance		(433.5	)%		14.2	%		(38.7	)%
Change in unrecognized tax benefits		(13.5	)%		7.2	%		(6.8	)%
Effective income tax rate		(411.9	)%		20.4	%		(17.1	)%

Schedule of deferred tax assets and liabilities

	As of September 30,
	2012						2011
	Current			Non Current			Current			Non Current
Deferred tax assets:
Deferred revenue	$	—		$	—		$	3,058		$	—
Reserves and accruals		1,514,711			240,390			1,677,183			238,179
Research and development credits		80,000			774,318			80,000			848,669
NOL carryforwards—state		—			1,236,554			—			1,226,649
Stock options		—			614,087			—			503,978
Other		—			6,304			—			12,973
		1,594,711			2,871,653			1,760,241			2,830,448
Less: Valuation allowance		(6,549	)		(1,448,177	)		(1,307,517	)		(2,696,113	)
Total deferred tax assets		1,588,162			1,423,476			452,724			134,335
Deferred tax liabilities:
Depreciation		—			(705,587	)		—			(701,298	)
Other		—			—			(14,089	)		—
Total deferred tax liabilities		—			(705,587	)		(14,089	)		(701,298	)
Net deferred tax asset (liability)	$	1,588,162		$	717,889		$	438,635		$	(566,963	)

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

	For the Fiscal Year Ended September 30,
	2012			2011			2010
Balance at beginning of year	$	491,000		$	425,000		$	474,000
Unrecognized tax benefits related to prior years		—			—			—
Unrecognized tax benefits related to current year		12,000			67,000			34,000
Settlements		—			—			—
Decrease in unrecognized tax benefits due to the lapse of applicable statute of limitations		(100,000	)		(1,000	)		(83,000	)
Balance at end of year	$	403,000		$	491,000		$	425,000