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Effects of Adopting ASC Topic 606, Statements of Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) [Abstract]    
Net loss $ (7,605) $ (3,894)
Other comprehensive (loss), net of tax:    
Change in equity adjustment from foreign currency translation, net of tax 0 (1)
Change in unrealized gain (loss) on investments, net of tax 1 (4)
Total other comprehensive gain (loss) net of tax 1 (5)
Comprehensive loss (7,604) $ (3,899)
Pre-606 [Member]    
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) [Abstract]    
Net loss (7,230)  
Other comprehensive (loss), net of tax:    
Change in equity adjustment from foreign currency translation, net of tax 0  
Change in unrealized gain (loss) on investments, net of tax 1  
Total other comprehensive gain (loss) net of tax 1  
Comprehensive loss (7,229)  
Effects of ASC Topic 606 [Member] | ASC Topic 606 [Member]    
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) [Abstract]    
Net loss (375)  
Other comprehensive (loss), net of tax:    
Change in equity adjustment from foreign currency translation, net of tax 0  
Change in unrealized gain (loss) on investments, net of tax 0  
Total other comprehensive gain (loss) net of tax 0  
Comprehensive loss $ (375)