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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%