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Receivables, Net
12 Months Ended
Dec. 28, 2019
Receivables [Abstract]  
RECEIVABLES, NET RECEIVABLES, NET
Cadence’s current and long-term receivables balances as of December 28, 2019 and December 29, 2018 were as follows:
 
As of
 
December 28,
2019
 
December 29,
2018
 
(In thousands)
Accounts receivable
$
179,250

 
$
164,223

Unbilled accounts receivable
126,165

 
136,795

Long-term receivables
3,082

 
5,972

Total receivables
308,497

 
306,990

Less allowance for doubtful accounts
(869
)
 
(3,936
)
Total receivables, net
$
307,628

 
$
303,054


Cadence’s customers are primarily concentrated within the semiconductor and electronics systems industries. As of December 28, 2019, no customer accounted for 10% or more of Cadence’s total receivables. As of December 29, 2018, one customer accounted for 11% of Cadence’s total receivables.
Allowance for doubtful accounts
Cadence’s provisions for losses on its accounts receivable during fiscal 2019, 2018 and 2017 were as follows:
 
 
Balance at Beginning of Period
 
Charged to Costs and Expenses
 
Uncollectible Accounts Written Off, Net
 
Balance at End of Period
 
 
 
 
 
 
 
 
 
Year ended December 28, 2019
 
$
3,936

 
$
632

 
$
(3,699
)
 
$
869

Year ended December 29, 2018
 

 
5,102

 
(1,166
)
 
3,936

Year ended December 30, 2017
 
$

 
$
2,623

 
$
(2,623
)
 
$