Consolidated Balance Sheets (Parenthetical)	Jun. 30, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares
Class A
Common stock, par value | $ / shares	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	1,500,000,000	1,500,000,000
Common stock, issued (in shares)	9,886,644	7,799,093
Common stock, outstanding (in shares)	9,886,644	7,799,093
Class B
Common stock, par value | $ / shares	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	175,000,000	175,000,000
Common stock, issued (in shares)	3,654,147	5,464,196
Common stock, outstanding (in shares)	3,654,147	5,464,196
Class C
Common stock, par value | $ / shares	$ 0.0001	$ 0.0001
Common stock, authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	0	0
Common stock, outstanding (in shares)	0	0