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Stock Based Compensation - Narrative (Details) - 2014 Equity Plan - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
May 19, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for equity awards (in shares) 50,000    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares common stock upon satisfaction of applicable vesting conditions (in shares) 1   1
Unrecognized compensation expense, unvested RSUs $ 288 $ 317  
RSUs granted to non-employee directors (in shares)     1,220
Unrecognized director compensation expense, unvested RSUs $ 7