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Stockholders' Equity (Stock Purchase) (Details) - 2014 Employee Stock Purchase Plan - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Oct. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Purchase period of offering     6 months    
Rate of purchase price of stock on fair value (as a percent)     85.00%    
Purchases under the award     139,574    
Weighted Average purchase price $ 2.36   $ 2.36    
Number of shares available for future grants 1,735,734   1,735,734    
Stock-based compensation expense $ 0.2 $ 0.2 $ 0.3 $ 0.3  
Maximum          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Discount rate on the value of shares through payroll deductions (as a percent)     15.00%    
Expiration period of each offering     27 months    
Number of shares reserved for future issuance         255,500