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Receivables, net | 12 Months Ended
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Dec. 29, 2018
Receivables [Abstract] |
RECEIVABLES, NET | RECEIVABLES, NET Cadence’s current and long-term receivables balances as of December 29, 2018 and December 30, 2017 were as follows:
| As of
| December 29, 2018 |  | December 30, 2017
| (In thousands)
Accounts receivable | $ | 164,223 |  |  | $ | 119,325 |
Unbilled accounts receivable | 136,795 |  |  | 71,101 |
Long-term receivables | 5,972 |  |  | 12,239 |
Total receivables | 306,990 |  |  | 202,665 |
Less allowance for doubtful accounts | (3,936 | ) |  | — |
Total receivables, net | $ | 303,054 |  |  | $ | 202,665 |
Cadence’s customers are primarily concentrated within the semiconductor and electronics systems industries. As of December 29, 2018, one customer accounted for 11% of Cadence’s total receivables. As of December 30, 2017, one customer accounted for 17% of Cadence’s total receivables. Allowance for doubtful accounts Cadence’s provisions for losses on its accounts receivable during fiscal 2018, 2017 and 2016 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 29, 2018 |  | $ | — |  |  | $ | 5,102 |  |  | $ | (1,166 | ) |  | $ | 3,936 |
Year ended December 30, 2017 |  | — |  |  | 2,623 |  |  | (2,623 | ) |  | — |
Year ended December 31, 2016 |  | $ | — |  |  | $ | 308 |  |  | $ | (308 | ) |  | $ | — |

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