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Stockholders' Equity - Equity Incentive Plan (Details) - shares
Sep. 30, 2021
Aug. 22, 2011
Equity Incentive B 2011 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, capital shares reserved for future issuance (shares)   4,375
Incentive compensation for employees and consultants [Member] | The Amended and Restated May 2011 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, capital shares reserved for future issuance (shares) 3,602,509  
Maximum [Member] | Incentive compensation for employees and consultants [Member] | The Amended and Restated May 2011 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock, capital shares reserved for future issuance (shares) 7,500,000