Leases - Assets and Liabilities - Finance Leases (Details) $ in Thousands	Sep. 30, 2020 USD ($)
Finance Lease, Right-of-Use Asset, after Accumulated Amortization [Abstract]
Property, plant and equipment, at cost	$ 2,540
Accumulated amortization	(1,246)
Property, plant and equipment, net	1,294
Finance Lease Liability [Abstract]
Accrued expenses and other current liabilities	$ 1,135
Finance Lease Liability Current, Statement of Financial Position	brks:AccruedExpensesAndOtherCurrentLiabilities
Other long-term liabilities	$ 348
Finance Lease Liability Non Current, Statement of Financial Position	us-gaap:OtherLiabilitiesNoncurrent
Total finance lease liabilities	$ 1,483