Leases - Lease Costs and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease costs:
Operating lease costs	$ 272	$ 149	$ 779	$ 464
Short-term lease costs	0	2	0	13
Variable lease costs	29	23	84	69
Total	301	174	863	546
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 264	$ 145	$ 759	$ 447