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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator:        
Net loss $ (1,804) $ (3,114) $ (4,194) $ (7,636)
Denominator:        
Basic weighted average common shares outstanding (in shares) 11,949 11,791    
Weighted Average Number of Shares Outstanding, Basic and Diluted 11,949 11,791 11,925 11,755
Potential common shares from equity awards and warrants (in shares) 0 0 0 0
Diluted weighted average shares (in shares) 11,949 11,791 11,925 11,755