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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net loss $ (37,177) $ (14,858) $ (11,072)
Other comprehensive loss:      
(Loss) gain on translation of foreign operations (76) 3 (54)
Unrecognized loss on available-for-sale securities (67) (5)  
Comprehensive loss $ (37,320) $ (14,860) $ (11,126)