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Stock-Based Compensation (Details 2)				1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2015 USD ($) shares	May. 26, 2015 shares	Feb. 28, 2015 USD ($) shares	Jun. 30, 2010 USD ($) item shares	Sep. 30, 2015 $ / shares shares	Sep. 30, 2014	Sep. 30, 2015 $ / shares shares	Sep. 30, 2014
Stock-Based Compensation
Outstanding options fully vested and expected to vest (in shares)					8,415,000		8,415,000
Weighted average exercise price of options fully vested and expected to vest (in dollars per share) | $ / shares					$ 3.69		$ 3.69
Awards exercisable (in shares)					6,109,000		6,109,000
Weighted average exercise price of awards exercisable (in dollars per share) | $ / shares					$ 3.98		$ 3.98
Options
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Risk-free interest rate, minimum (as a percent)					1.40%	1.30%	0.60%	1.30%
Risk-free interest rate, maximum (as a percent)						1.70%	1.70%	1.70%
Volatility, minimum (as a percent)					59.30%	53.70%	55.70%	53.70%
Volatility, maximum (as a percent)						55.60%	59.30%	57.50%
Expected life					4 years
Dividend yield (as a percent)					0.00%	0.00%	0.00%	0.00%
Options | Minimum
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Expected life						4 years	4 years	4 years
Options | Maximum
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Expected life						5 years	5 years	5 years
ESPP
Employee Stock Purchase Plan
Number of shares reserved for issuance				2,000,000
Increase in number of shares reserved for issuance		2,000,000
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $				$ 25,000
Number of offering periods | item				2
Offering period				6 months
Purchase price to be paid by participants as a percentage of price per share either at the beginning or the end of each six-month offering period, whichever is less				85.00%
Shares of common stock issued under the plan	268,000		339,000
Aggregate purchase price (in dollars) | $	$ 339,000		$ 518,000
Shares authorized and unissued					2,200,000		2,200,000

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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