Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Right-of-use assets	$ 985
Lease liabilities	1,037
Del Mar, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	62
Lease liabilities	69
Burlingame, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	534
Lease liabilities	578
Edwardsville, IL [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	389
Lease liabilities	$ 390