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Stock-Based Compensation Plan (Details) - shares
1 Months Ended 3 Months Ended
Jun. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Stock-Based Compensation Plan      
Number of shares withheld to cover the cost of the exercise   0 2,737
Amended and Restated 2008 Option Plan | Stock option      
Stock-Based Compensation Plan      
Additional shares authorized for issuance (in shares) 200,000    
Maximum shares authorized (in shares)   2,529,296  
Vesting period (in years)   4 years  
Contractual term (in years)   10 years  
Shares available for grant (in shares)   32,114  
Options granted (in shares)   0 0