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Commitments (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
Sublease [Abstract]        
Rent expense $ 110 $ 111 $ 332 $ 338
Future Annual Minimum Payments under Operating Leases [Abstract]        
2018 92   92  
2019 352   352  
2020 213   213  
2021 220   220  
2022 227   227  
Thereafter $ 17   $ 17  
Bormioli [Member]        
Sublease [Abstract]        
Area of office building space | ft²     8,513  
Optional term extension of lease     2 years