Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Operating Leases (Details)

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Commitments and Contingencies - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 19, 2018
Commitments and Contingencies Disclosure [Abstract]        
Annual rent expense $ 700      
Percent increase in annual rent expense       3.50%
Security deposit 214      
2019 747      
2020 773      
2021 801      
2022 829      
2023 425      
Total 3,575      
Rent expense 632 $ 754 $ 782  
Deferred rent payable 74 36    
Rental income $ 244 $ 350 $ 394