Stock-Based Compensation - Schedule of Stock Options Activity (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
NUMBER OF SHARES
Beginning balance (in shares) | shares	8,425,551
Granted (in shares) | shares	412,417
Exercised (in shares) | shares	(11,684)
Canceled (in shares) | shares	(125,121)
Ending balance (in shares) | shares	8,701,163
Options exercisable (in shares) | shares	5,750,958
WEIGHTED AVERAGE EXERCISE PRICE
Beginning balance (in dollars per share) | $ / shares	$ 29.06
Granted (in dollars per share) | $ / shares	20.94
Exercised (in dollars per share) | $ / shares	14.06
Canceled (in dollars per share) | $ / shares	41.16
Ending balance (in dollars per share) | $ / shares	28.52
Options exercisable (in dollars per share) | $ / shares	$ 25.00
WEIGHTED AVERAGE REMAINING CONTRACTUAL LIFE (YEARS)
Options outstanding, weighted average remaining contractual life	6 years 7 months 6 days
Options exercisable, weighted average remaining contractual life	5 years 4 months 24 days
AGGREGATE INTRINSIC VALUE
Options outstanding | $	$ 15,408
Options exercisable | $	$ 15,408