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Commitments and Contingencies - Operating Leases - (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 11, 2020
Sep. 30, 2019
May 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Commitments and Contingencies                
Right-of-use assets       $ 100   $ 100   $ 116
Operating lease, liability current       23   23   $ 22
Operating lease, liability noncurrent       $ 77   $ 77    
Non-cash expense related to Korea lease             $ 128  
Korea                
Commitments and Contingencies                
Term of contract     5 years          
Option to renew     true          
Renewal term     5 years          
Right-of-use assets   $ 126     $ 126   $ 126  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]   us-gaap:OtherCurrentLiabilitiesMember     us-gaap:OtherCurrentLiabilitiesMember   us-gaap:OtherCurrentLiabilitiesMember  
Operating lease, liability current   $ 20     $ 20   $ 20  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]   us-gaap:OtherNoncurrentLiabilitiesMember     us-gaap:OtherNoncurrentLiabilitiesMember   us-gaap:OtherNoncurrentLiabilitiesMember  
Operating lease, liability noncurrent   $ 106     $ 106   $ 106  
Operating lease discount rate       10.00%   10.00%    
Weighted average remaining lease term       3 years 9 months   3 years 9 months    
Non-cash expense related to Korea lease       $ 8   $ 24    
Non-cash lease liability adjustment         $ 5 24 $ 8  
Head Quarters in Boston Lease                
Commitments and Contingencies                
Term of contract 6 months 1 year     1 year   1 year  
Monthly rental cost $ 3 $ 21            
Rent concessions granted by the landlord $ 1 $ 32     $ 32   $ 32  
Lease expense       64 $ 40 244 $ 93  
Termination fee       $ 83   $ 83