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Stockholders' Equity (Restricted Stock) (Details) - Restricted stock units - 2014 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
Stockholders' Equity, other disclosures        
Requisite service period, annually     3 years  
Stock-based compensation expense $ 1.8 $ 2.3 $ 3.7 $ 5.2
Unrecognized compensation costs (in dollars) $ 11.4   $ 11.4  
Weighted average period over which unrecognized compensation costs are expected to be recognized     2 years 1 month 2 days  
Number of shares        
Balance at beginning of the period     2,799,552  
Granted     3,333,797  
Vested     (596,101)  
Forfeited     (167,383)  
Balance at end of the period 5,369,865   5,369,865  
Weighted average grant date fair value        
Balance at beginning of the period     $ 8.11  
Granted     2.22  
Vested     5.46  
Balance at end of the period $ 5.00   $ 5.00