Commitments - Schedule of Balance Sheet Classification of the Company's Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020		Dec. 31, 2019
Operating lease right-of-use assets	$ 27,667		$ 1,704
Operating lease liabilities:
Accrued and other current liabilities	1,253		1,503
Non-current lease liabilities	34,436		566
Accrued And Other Liabilities Current [Member]
Operating lease liabilities:
Accrued and other current liabilities	$ 1,253	[1]	$ 1,503

[1] Includes current portion of operating lease liabilities as of September 30, 2020 and December 31, 2019.