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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS UNAUDITED - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net loss: $ (1,871) $ (2,393) $ (4,131) $ (4,685)
Other comprehensive loss        
Change in unrealized gain (loss) on investments 0 (1) 0 0
Change in foreign currency translation adjustment (3) (9) (8) (14)
Total other comprehensive loss (3) (10) (8) (14)
Comprehensive loss $ (1,874) $ (2,403) $ (4,139) $ (4,699)