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Stock-Based Compensation - Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Options
Beginning balance (in shares)	466,677
Granted (in shares)	134,450
Exercised (in shares)	(468)
Canceled (in shares)	(4,868)
Ending balance (in shares)	595,791	466,677
Exercisable at period end (in shares)	388,581
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 61.04
Granted (in dollars per share)	70.44
Exercised (in dollars per share)	64.54
Canceled (in dollars per share)	69.40
Ending balance (in dollars per share)	63.07	$ 61.04
Exercisable (in dollars per share)	$ 54.88
Weighted Average Remaining Contractual Life
Outstanding, weighted average remaining contractual life (in years)	6 years 2 months 12 days	5 years 8 months 12 days
Exercisable weighted average remaining contractual life (in years)	5 years 2 months 12 days
Aggregate Intrinsic Value
Beginning balance	$ 5,115
Granted	210
Exercised	(3)
Canceled	0
Ending balance	5,321	$ 5,115
Exercisable	$ 6,652

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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