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Effects of Adopting ASU Topic 606, Income Statement Highlights (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement Highlights [Abstract]        
Revenue $ 16 $ 396 $ 22 $ 771
Loss from operations (6,462) (3,811) (14,070) (7,717)
Interest income, net 12 13 20 31
Loss before taxes (6,450) (3,798) (14,050) (7,686)
Provision for income taxes 0 0 (5) (5)
Net loss (6,450) $ (3,798) (14,055) $ (7,691)
Pre-Topic 606 [Member]        
Income Statement Highlights [Abstract]        
Revenue 391   772  
Loss from operations (6,087)   (13,320)  
Interest income, net 12   20  
Loss before taxes (6,075)   (13,300)  
Provision for income taxes     (5)  
Net loss (6,075)   (13,305)  
Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member]        
Income Statement Highlights [Abstract]        
Revenue (375)   (750)  
Loss from operations (375)   (750)  
Interest income, net 0   0  
Loss before taxes (375)   (750)  
Provision for income taxes     0  
Net loss $ (375)   $ (750)