Stockholders' Equity - Common Stock (Details)	Jun. 30, 2021 vote $ / shares shares	Dec. 31, 2020 vote $ / shares shares
Common Stock
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Common Stock Class A
Common Stock
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, issued (in shares)	165,715,499	153,496,222
Common stock, outstanding (in shares)	165,715,499	153,496,222
Votes per share | vote		1
Common Stock Class B
Common Stock
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	10,218,422	10,551,302
Common stock, outstanding (in shares)	10,218,422	10,551,302
Votes per share | vote	10