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Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Loss per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]        
Securities excluded from net loss per share calculation (in shares) 0 62 31 90
Numerator:        
Net loss $ (946) $ (1,920) $ (6,065) $ (6,114)
Denominator:        
Basic weighted average common shares outstanding (in shares) 12,370 12,059 12,278 11,970
Diluted weighted average shares (in shares) 12,370 12,059 12,278 11,970