Stock-Based Compensation - Stock Option Activity (Detail) shares in Thousands	6 Months Ended
	Jun. 30, 2022 $ / shares shares
Options
Outstanding as of beginning of period | shares	11,708
Granted | shares	1,327
Exercised | shares	(23)
Forfeited | shares	(471)
Outstanding as of end of period | shares	12,541
Weighted- Average Exercise Price
Outstanding as of beginning of period | $ / shares	$ 4.15
Granted | $ / shares	2.02
Exercised | $ / shares	1.76
Forfeited | $ / shares	4.27
Outstanding as of end of period | $ / shares	$ 3.92