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Stock-Based Compensation - Valuation Assumption & ESPP (Details)		1 Months Ended		3 Months Ended
	May. 26, 2015 shares	Feb. 29, 2016 USD ($) shares	Jun. 30, 2010 USD ($) item shares	Mar. 31, 2016 shares	Mar. 31, 2015
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Options granted (in shares)				0
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)					0.60%
Risk-free interest rate, maximum (as a percent)					1.40%
Volatility, minimum (as a percent)					55.80%
Volatility, maximum (as a percent)					57.70%
Dividend yield (as a percent)					0.00%
Options | Minimum
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Expected life					3 years
Options | Maximum
Assumptions used in estimation of fair value of the share-based payment awards on the grant date
Expected life					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
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		373,000
Aggregate purchase price (in dollars) | $		$ 197,000
Shares authorized and unissued				1,800,000
ESPP | Maximum
Employee Stock Purchase Plan
Maximum amount of shares that eligible employee may purchase annually (in dollars) | $			$ 25,000

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Represents the highest amount of shares that an eligible employee can purchase under the plan per period.

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Represents the number of offering periods per annum over which an employee may purchase the shares of common stock of the entity under the stock-based compensation arrangements.

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Represents the offering period over which an employee may purchase the shares of common stock of the entity under the stock-based compensation arrangements.

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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.

+ References

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-Publisher FASB
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-SubTopic 10
-Section 50
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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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 minimum 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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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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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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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