Leases - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating leases
2020	$ 1,861
2021	1,909
2022	1,961
2023	2,017
2024	1,372
Total undiscounted cash flows	9,120
Less: amount representing interest	(2,049)
Present value of lease liabilities	7,071
Finance leases
2020	24
2021	14
2022	3
2023	0
2024	0
Total undiscounted cash flows	41
Less: amount representing interest	(8)
Present value of lease liabilities	$ 33