Commitments and Contingencies - Leases - Weighted-Average Remaining Lease Term and Discount Rate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases
Weighted-average remaining lease term (years)	7 years 11 months 9 days
Weighted-average discount rate	4.61%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 267
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,072