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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
Dec. 01, 2020
Jun. 01, 2020
Dec. 01, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Assumptions              
Expected dividend           0.00%  
Stock Options              
Stock-based awards              
Options granted during period       47,050 46,550 163,625 294,875
Options granted during period, weighted-average price (in dollars per share)       $ 5.98 $ 5.12 $ 6.86 $ 4.42
Total compensation cost, net of forfeitures, of all options granted but not yet vested       $ 1,200   $ 1,200  
Weighted average period over which unrecognized compensation is expected to be recognized           1 year 2 months 12 days  
Issuance of common stock upon exercise of stock options (in shares)       43,796 52,004 213,850 141,639
Assumptions              
Volatility       72.00% 71.00% 72.00% 70.00%
Risk free interest rate       0.60% 1.16% 0.41% 1.55%
Expected life (in years)       4 years 4 months 10 days 4 years 4 months 2 days 4 years 4 months 6 days 4 years 3 months 29 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 shares available for issuance           716,122  
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%  
ESPP Grants on June 1, 2020              
ESPP              
ESPP purchase rights granted   58,096          
Stock-based compensation           $ 169  
ESPP Grants on December 1, 2020              
ESPP              
ESPP purchase rights granted 74,752            
Stock-based compensation       $ 185   $ 185  
ESPP Grants on December 1, 2019              
ESPP              
ESPP purchase rights granted     69,368        
Stock-based compensation         $ 87   $ 87