Select Balance Sheet and Statement of Operations Information - Schedule of Finance Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest And Debt Expense [Abstract]
Interest expense	$ 1,750	$ 1,979	$ 6,084	$ 5,555
Accretion on long-term debt and amortization of fees	147	118	438	349
Total finance expenses	$ 1,897	$ 2,097	$ 6,522	$ 5,904