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Summary of Business and Significant Accounting Policies - Employee Stock Purchase Plan (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
ESPP
Stock-based compensation	$ 336,000	$ 736,000	$ 698,000	$ 1,055,000
Assumptions
Expected life (in years)	4 years 4 months 21 days	4 years 4 months 10 days	4 years 4 months 2 days	4 years 6 months 4 days
Expected volatility	68.00%	59.00%	66.00%	57.00%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Risk free interest rate	2.88%	2.07%	2.85%	1.88%
Employee Stock Purchase Plan (ESPP)
ESPP
Percentage of stock price at which stock can be purchased			85.00%
Purchase period			6 months
Stock-based compensation	$ 33,000	$ 0	$ 33,000	$ 0
ESPP purchase rights granted	94,805		94,805
Unrecognized compensation expense	$ 235,000		$ 235,000
ESPP shares issued	0		0
ESPP shares available for issuance			$ 400,000
Assumptions
Expected life (in years)			5 months 19 days
Expected volatility			90.00%
Risk free interest rate			2.54%
Weighted average grant day fair value	$ 2.82		$ 2.82
Employee Stock Purchase Plan (ESPP) | Minimum
ESPP
Percentage of base earnings that can be withheld			1.00%
Employee Stock Purchase Plan (ESPP) | Maximum
ESPP
Offering period			27 months
Percentage of base earnings that can be withheld			15.00%

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Unrecognized cost of purchase rights awarded to employees under the employee stock purchase plan.

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Percentage limit of employee base earnings an employee may have withheld to purchase company common stock under terms of an employee stock purchase plan.

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The period with respect to which the right to purchase shares of stock may be granted under the plan.

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The percentage of the lower of the fair market value at entry date of the applicable offering period or at the end of each applicable purchasing period at which stock may be purchased under the terms of the plan.

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The length of time of a series of specific purchase periods during the offering period.

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Number of purchase rights granted during the period as a result of an employee stock purchase plan.

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Number of shares available for issuance as a result of an employee stock purchase plan.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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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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