Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Right-of-use asset	$ 1,483
Lease liabilities	1,519
Del Mar, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use asset	745
Lease liabilities	745
Burlingame, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use asset	392
Lease liabilities	429
Edwardsville, IL [Member]
Lessee Lease Description [Line Items]
Right-of-use asset	346
Lease liabilities	$ 345