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Debt (Tables)
 12 Months Ended
Dec. 28, 2019
Debt Disclosure [Abstract]  
Schedule of Components of Convertible Senior Notes
The net carrying amounts of the debt obligation were as follows (in thousands):
 
December 28, 2019
 
December 29, 2018
Principal
$
402,500

 
$
402,500

Unamortized discount (1)
(109,652
)
 
(127,264
)
Unamortized issuance cost (1)
(7,158
)
 
(8,307
)
Net carrying amount
$
285,690

 
$
266,929

(1) 
Unamortized debt conversion discount and issuance costs will be amortized over the remaining life of the 2024 Notes, which is approximately 57 months.
Schedule of Interest Expense Recognized Related To Notes
The following table sets forth total interest expense recognized related to the 2024 Notes (in thousands): 
 
Year Ended
 
December 28, 2019
 
December 29, 2018
Contractual interest expense
$
8,553

 
$
2,613

Amortization of debt issuance costs
1,149

 
373

Amortization of debt discount
17,612

 
5,716

Total interest expense
$
27,314

 
$
8,702


The following table sets forth total interest expense recognized related to the 2018 Notes (in thousands): 
 
Year ended
 
December 29, 2018
Contractual interest expense
$
1,094

Amortization of debt issuance costs
402

Amortization of debt discount
4,671

Total interest expense
$
6,167