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Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Loss per Share (Details)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 11, 2020
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2020
USD ($)
shares
Numerator:          
Net loss | $   $ (2,473) $ (4,340) $ (4,115) $ (4,881)
Denominator:          
Basic weighted average common shares outstanding (in shares) [1]   4,211 3,192 3,913 3,139
Diluted weighted average common shares outstanding (in shares) [1]   4,211 3,192 3,913 3,139
Reverse stock split ratio 0.2        
[1] * Shares outstanding for prior periods have been restated for the 1-for-5 reverse stock split effective June 11, 2020.