Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Preferred stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, authorized (in shares)	105,000,000
Common stock, issued (in shares)	61,653,898	59,261,051
Common stock, outstanding (in shares)	61,653,898	59,261,051
Class A common stock
Common stock, par value (usd per share)	$ 0.00001	$ 0.00001
Common stock, authorized (in shares)	94,000,000	94,000,000
Common stock, issued (in shares)	56,967,870	53,395,319
Common stock, outstanding (in shares)	56,967,870	53,395,319
Class B common stock
Common stock, par value (usd per share)	$ 0.00001	$ 0.00001
Common stock, authorized (in shares)	6,000,000	6,000,000
Common stock, issued (in shares)	4,686,028	5,865,732
Common stock, outstanding (in shares)	4,686,028	5,865,732