Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Lessee Lease Description [Line Items]
Right-of-use assets	$ 1,095	$ 1,483
Lease liabilities	1,141	1,519
Del Mar, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	646	745
Lease liabilities	673	745
Burlingame, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	174	392
Lease liabilities	191	429
Edwardsville, IL [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	275	346
Lease liabilities	$ 277	$ 345