Balance Sheet Account Detail - Facility and Equipment Under Lease (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	$ 3,842	$ 0
Building [Member]
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	3,379	0
Office Equipment [Member]
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	$ 463	$ 0