Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee Lease Description [Line Items]
Right-of-use assets	$ 1,103
Lease liabilities	1,162
Del Mar, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	90
Lease liabilities	99
Burlingame, CA [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	602
Lease liabilities	651
Edwardsville, IL [Member]
Lessee Lease Description [Line Items]
Right-of-use assets	411
Lease liabilities	$ 412