Stock-Based Compensation - Summary of Stock Option Transactions and Related Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options Outstanding, Beginning Balance (in shares) | shares	548,770
Options, Granted (in shares) | shares	233,732
Options, Exercised (in shares) | shares	0
Options, Forfeited (in shares) | shares	(21,757)
Options, Expired (in shares) | shares	(19,326)
Options Outstanding, Ending Balance (in shares) | shares	741,419
Options Exercisable, Ending Balance (in shares) | shares	408,316
Weighted Average Exercise Price, Outstanding Beginning Balance (in dollars per share) | $ / shares	$ 77.68
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	25.19
Weighted Average Exercise Price, Exercised (in dollars per share) | $ / shares	0
Weighted Average Exercise Price, Forfeited (in dollars per share) | $ / shares	49.53
Weighted Average Exercise Price, Expired (in dollars per share) | $ / shares	51.62
Weighted Average Exercise Price, Outstanding Ending Balance (in dollars per share) | $ / shares	62.64
Weighted Average Exercise Price, Exercisable Ending Balance (in dollars per share) | $ / shares	$ 78.37
Weighted Average Remaining Contractual Life - Years, Outstanding Ending Balance	6 years 1 month 6 days
Weighted Average Remaining Contractual Life - Years, Exercisable Ending Balance	5 years
Aggregate Intrinsic Value, Outstanding Ending Balance | $	$ 2,103
Aggregate Intrinsic Value, Exercisable Ending Balance | $	$ 0