Shareholders' Equity (Details) - USD ($)	3 Months Ended
	Mar. 24, 2020	Mar. 26, 2019	Jul. 23, 2018	Aug. 23, 2016	Feb. 26, 2016
Class of Stock [Line Items]
Shares repurchased, value		$ 4,306,000
Common Stock and Warrants
Class of Stock [Line Items]
Maximum authorized stock repurchase amount (up to)			$ 75,000,000.0	$ 50,000,000.0	$ 25,000,000.0
Increase in authorized repurchase amount			$ 25,000,000.0	$ 25,000,000.0
Remaining authorized stock repurchase amount	$ 22,300,000
Common Stock
Class of Stock [Line Items]
Shares repurchased (in shares)	270,874
Average price per share (in dollars per share)	$ 10.30
Shares repurchased, value	$ 2,800,000
Warrants
Class of Stock [Line Items]
Shares repurchased (in shares)	840,255
Average price per share (in dollars per share)	$ 1.78
Shares repurchased, value	$ 1,500,000