Shareholders' Equity - Additional Information (Detail)		12 Months Ended
	Mar. 29, 2017 $ / shares shares	Dec. 31, 2019 USD ($) vote $ / shares shares	Jan. 01, 2019 USD ($) $ / shares shares	Jan. 02, 2018 USD ($) $ / shares shares	Jul. 23, 2018 USD ($)	Aug. 23, 2016 USD ($)	Feb. 26, 2016 USD ($)
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		400,000,000	400,000,000
Number of votes entitled to each share | vote		1
Common stock, shares issued (in shares)		37,059,202	37,305,342
Common stock, shares outstanding (in shares)		37,059,202	37,305,342
Warrants to purchase of common stock (in shares)		5,105,982
Warrant exercise price per share (in dollars per share) | $ / shares		$ 11.50
Preferred stock, shares authorized (in shares)		1,000,000	1,000,000
Preferred stock, shares issued (in shares)		0	0
Preferred stock, shares outstanding (in shares)		0	0
Share Price | $ / shares		$ 3.59	$ 4.92	$ 4.63
Shares/warrants repurchased, value | $		$ 7,373,000	$ 16,316,000	$ 13,849,000
Common Stock and Warrants [Member]
Class of Stock [Line Items]
Maximum authorized stock & warrant repurchase amount (up to) | $					$ 75,000,000.0	$ 50,000,000	$ 25,000,000
Stock repurchase program, increase authorized amount | $					$ 25,000,000.0	$ 25,000,000
Remaining authorized stock/warrant repurchase amount | $		$ 22,300,000
Common Stock
Class of Stock [Line Items]
Shares/warrants repurchased (in shares/warrants)		574,481	1,408,071	986,497
Average cost per share/warrant (in dollars per share/warrant) | $ / shares		$ 10.17	$ 11.48	$ 12.41
Shares/warrants repurchased, value | $		$ 5,900,000	$ 16,200,000	$ 12,300,000
Warrants
Class of Stock [Line Items]
Shares/warrants repurchased (in shares/warrants)	400,000	846,441	47,511	424,439
Average cost per share/warrant (in dollars per share/warrant) | $ / shares	$ 3.75	$ 1.78	$ 2.55	$ 3.72
Discount on repurchase	5.00%
Share Price | $ / shares	$ 3.95
Shares/warrants repurchased, value | $		$ 1,500,000	$ 100,000	$ 1,600,000