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Balance Sheet Accounts - Future Minimum Lease Payments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
lease
Dec. 31, 2019
USD ($)
lease
Dec. 31, 2018
USD ($)
lease
Balance Sheet Related Disclosures [Abstract]      
Number of operating leases | lease 2 2 2
2020 $ 1,345 $ 1,345  
2021 1,362 1,362  
2022 1,376 1,376  
2023 1,291 1,291  
2024 820 820  
Beyond 413 413  
Total $ 6,607 $ 6,607  
Total     $ 3,661
2020     1,146
2021     864
2022     583
2023     583
2024     $ 485