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Summary of Business and Significant Accounting Policies - Summary of Stock Option Assumptions (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Summary of Business and Significant Accounting Policies [Abstract]
Common stock granted during the period	110,600	47,100	260,750	720,400
Weighted-average fair value of common stock	$ 2.08	$ 3.01	$ 2.12	$ 3.77
Dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility	58.00%	80.00%	62.00%	80.00%
Average risk-free interest rate	1.59%	1.60%	1.57%	1.69%
Expected life (in years)	5 years 18 days	4 years 6 months	5 years	4 years 6 months
Total compensation cost, net of forfeitures, of all options granted but not yet vested	$ 1.6		$ 1.6
Expected to be recognized			1 year 5 months 16 days
Options exercised	26,264	25,097	27,264	38,537

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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 estimated measure of the 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 risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Number of share options (or share units) exercised during the current period.

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