Summary of Business and Significant Accounting Policies - ESPP and Stock Option Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Stock Options
Stock-based awards
Options granted during period	46,550	24,000	294,875	237,250
Options granted during period, weighted-average price (in dollars per share)	$ 5.12	$ 7.86	$ 4.42	$ 5.21
Total compensation cost, net of forfeitures, of all options granted but not yet vested	$ 1,300		$ 1,300
Weighted average period over which unrecognized compensation is expected to be recognized			1 year 2 months 1 day
Issuance of common stock upon exercise of stock options (in shares)	52,004	276,354	141,639	492,607
Assumptions
Volatility	71.00%	71.00%	70.00%	67.00%
Risk free interest rate	1.16%	2.47%	1.55%	2.81%
Expected life (in years)	4 years 4 months 2 days	4 years 5 months 5 days	4 years 3 months 29 days	4 years 4 months 6 days
Expected dividend	0.00%	0.00%	0.00%	0.00%
Employee Stock Purchase Plan (ESPP)
ESPP
Percentage of stock price at which stock can be purchased			85.00%
Purchase period			6 months
ESPP purchase rights granted	69,368	94,805	69,368	94,805
Unrecognized compensation expense	$ 87	$ 267	$ 87	$ 267
ESPP shares available for issuance			837,978
Assumptions
Volatility			64.00%
Risk free interest rate			2.04%
Expected life (in years)			6 months
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%

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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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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