Stockholders' Equity - Common Stock (Details) - $ / shares	Mar. 31, 2020	Dec. 31, 2019	May 31, 2018
Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Class A
Common Stock
Common stock, authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, par value (in dollars per share)			$ 0.001
Common stock, issued (in shares)	128,606,443	126,882,172
Common stock, outstanding (in shares)	128,606,443	126,882,172
Common Class B
Common Stock
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	11,356,940	11,530,627
Common stock, outstanding (in shares)	11,356,940	11,530,627