Stockholders' Equity (Detail)	6 Months Ended
	Jun. 30, 2020 vote $ / shares shares	Dec. 31, 2019 $ / shares shares
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, par value (in usd per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	37,558,379	34,525,386
Common stock, shares outstanding (in shares)	37,558,379	34,525,386
Number of votes entitled to stockholders per share | vote	1
Conversion of stock (in shares)	1
Maximum percentage of aggregate voting power of capital stock which triggers conversion of stock	10.00%
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in usd per share) | $ / shares	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	32,281,936	32,942,636
Common stock, shares outstanding (in shares)	32,281,936	32,942,636
Number of votes entitled to stockholders per share | vote	10