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Summary of Business and Significant Accounting Policies - Summary of Stock Option Assumptions (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 19, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based Compensation Expense |  |  |  |  |
Closing stock price (in dollars per share) | $ 2.50 |  |  |  |
Options granted during period |  | 122,400 | 357,400 | 213,250 | 1,472,541
Options granted during period, weighted-average price (in dollars per share) |  | $ 3.94 | $ 1.16 | $ 5.29 | $ 1.26
Total compensation cost, net of forfeitures, of all options granted but not yet vested |  | $ 1,700,000 |  | $ 1,700,000 |
Weighted average period over which unrecognized compensation is expected to be recognized |  |  |  | 1 year 5 months 19 days |
Exercise of stock options (in shares) |  | 14,967 | 34,899 | 216,253 | 138,049
Stock-based compensation assumptions |  |  |  |  |
Expected volatility |  | 68.00% | 59.00% | 66.00% | 57.00%
Average risk-free interest rate |  | 2.88% | 2.07% | 2.85% | 1.88%
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
Dividend yield |  | 0.00% | 0.00% | 0.00% | 0.00%
Employee, Not Executive or Director | 2005 Management Stock Option Plan |  |  |  |  |
Stock-based Compensation Expense |  |  |  |  |
Modified exercise price approved for previously issued options with higher grant date exercise price (in dollars per share) | $ 2.50 |  |  |  |
Incremental stock-based compensation | $ 445,000 |  |  |  |
Incremental stock-based compensation recognized |  | $ 0 | $ 373,000 | $ 3,000 | $ 414,000
Incremental stock-based compensation not yet recognized |  | $ 8,000 | $ 31,000 | $ 8,000 | $ 31,000
Number of repriced shares | 804,172 |  |  |  |
Modified weighted-average fair value (in dollars per share) | $ 1.19 |  |  |  |

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