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Stockholder's Equity - Stock Options (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 09, 2021
Jul. 08, 2021
Jan. 01, 2021
Sep. 08, 2017
2017 Plan | Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum shares authorized (in shares)           400,000
Award vesting period 4 years          
Expiration period 10 years          
Shares available for issuance was increased percent         4.00%  
Share-based compensation arrangement by represents an increase (in shares)   170,324        
Shares available for future issuance (in shares) 104,255          
Inducement Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum shares authorized (in shares)     100,000 100,000