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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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- Definition Unrecognized cost of purchase rights awarded to employees under the employee stock purchase plan. + References No definition available. + Details
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- Definition Percentage limit of employee base earnings an employee may have withheld to purchase company common stock under terms of an employee stock purchase plan. + References No definition available. + Details
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- Definition The period with respect to which the right to purchase shares of stock may be granted under the plan. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The length of time of a series of specific purchase periods during the offering period. + References No definition available. + Details
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- Definition Number of purchase rights granted during the period as a result of an employee stock purchase plan. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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