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Effects of Adopting ASU Topic 606, Cash Flow Statement Highlights (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash Flow Statement Highlights [Abstract]        
Net loss $ (6,450) $ (3,798) $ (14,055) $ (7,691)
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]        
Deferred revenue     0 (750)
Net cash used in operating activities     (11,484) $ (9,390)
Pre-Topic 606 [Member]        
Cash Flow Statement Highlights [Abstract]        
Net loss (6,075)   (13,305)  
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]        
Deferred revenue     (750)  
Net cash used in operating activities     (11,484)  
Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member]        
Cash Flow Statement Highlights [Abstract]        
Net loss $ (375)   (750)  
Adjustments to reconcile net loss to net cash used in operating activities [Abstract]        
Deferred revenue     750  
Net cash used in operating activities     $ 0