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Equity Compensation Plans - Summary of Activity Related to ESPP (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Stock Purchase Plan (ESPP) Activity [Roll Forward]      
Balance at beginning of period $ 17 $ 4 $ 6
Employee purchases 595 347 524
Cost of common stock issued (605) (334) (526)
Balance at End of Period $ 7 $ 17 $ 4