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Commitments and Contingencies - Summary of Future Payments Under Non-Cancelable Operating Lease (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Operating Lease    
2019 (excluding the six months ended June 30, 2019) $ 237  
2020 581  
2021 598  
2022 616  
2023 526  
Total undiscounted lease payments 2,558  
Less: imputed interest (425)  
Total operating lease liabilities $ 2,133  
Operating Lease    
2019   $ 564
2020   581
2021   598
2022   616
2023   526
Total payments   $ 2,885