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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net loss $ (7,084) $ (3,449) $ (25,929) $ (9,365)
Other comprehensive loss:        
Loss (gain) on translation of foreign operations 75 (171) 73 (213)
Unrecognized gain on available-for-sale securities 1   5  
Comprehensive loss $ (7,008) $ (3,620) $ (25,851) $ (9,578)