Stockholder Rights Plan - Narrative (Detail) - Rights Agreement		12 Months Ended
	Aug. 28, 2019 Vote $ / shares	Dec. 31, 2019
Equity [Line Items]
Common stock, voting rights		Under the terms of the Rights Agreement, each share of our common stock is accompanied by one right; each right entitles the stockholder to purchase from the Company one one-thousandth of a newly issued share of Series A Junior Participating Preferred Stock at an exercise price of $12, subject to adjustment.
Number of votes for each common stock held | Vote	1
Acquired beneficial ownership percentage	10.00%
Acquired beneficial ownership percentage in certain circumstances	20.00%
Stock rights redeem price per right	$ 0.001
Common stock rights expiration date	Aug. 28, 2020
Series A Junior Participating Preferred Stock
Equity [Line Items]
Common stock shareholders each right entitled to purchase preferred stock	0.001
Preferred stock exercise price	$ 12