CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Property and equipment, accumulated depreciation	$ 112,185	$ 92,895
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	123,217,010	112,075,474
Common stock, shares outstanding	123,217,010	112,075,474