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Statements Of Comprehensive Income (Loss) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statements Of Comprehensive Income (Loss) [Abstract]      
Net loss $ (14,850) $ (14,145) $ (12,386)
Other comprehensive income (loss):      
Net unrealized gains (losses) on marketable securities   (1)  
Comprehensive loss $ (14,850) $ (14,146) $ (12,386)