Balance Sheet Account Detail - Facility and Equipment Under Lease (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	$ 3,774
Building [Member]
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	3,287
Office Equipment [Member]
Lessee, Lease, Description [Line Items]
Facility and equipment under lease (Note 9(a))	$ 487