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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

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