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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net loss $ (9,618) $ (5,836)
Other comprehensive loss, net of tax    
Foreign currency translation adjustment, net of income tax benefit (expense) of $0 and $2 for the three months ended March 31, 2018 and 2017, respectively (11) (34)
Unrealized (loss) gain on available-for-sale securities, net of income tax benefit (expense) of $0 and ($2) for the three months ended March 31, 2018 and 2017, respectively (45) 2
Other comprehensive loss, net of tax (56) (32)
Comprehensive loss $ (9,674) $ (5,868)