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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Operating Leased Assets [Line Items]      
Restricted cash $ 208   $ 207
Remaining Aggregate Annual Commitments [Abstract]      
2018 (remaining nine months) 641    
2019 874    
2020 897    
2021 718    
2022 445    
Thereafter 74    
Total $ 3,649    
Office Space in New York [Member]      
Operating Leased Assets [Line Items]      
LOC expiration date Oct. 29, 2020    
Number of days written notice 90 days    
Rent expense $ 140 $ 139  
Lease expiration date Feb. 28, 2023    
Inotek Former Headquarters [Member]      
Operating Leased Assets [Line Items]      
Rent expense $ 83