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Other Current Liabilities (Tables)
12 Months Ended
Dec. 31, 2021
Other Current Liabilities  
Schedule of other current liabilities

    

December 31, 

    

December 31, 

2020

2021

(in thousands)

Accrued payroll and related expenses

$

10,681

 

18,515

Accrued mask, mold fees and other expenses for RD

 

11,503

 

13,379

Payable for purchases of building and equipment

 

1,599

 

3,481

Accrued software maintenance

 

4,531

 

4,359

Allowance for sales discounts

 

809

 

1,570

Lease liabilities

3,068

4,602

Accrued insurance, welfare expenses, professional fee

 

13,920

 

13,638

$

46,111

 

59,544

Schedule of activity in the sales discounts

The activity in the sales discounts is as follows:

Allowance for sales discounts

Balance at

Balance at

beginning

Charges to

Amounts

end of

Period

    

of year

    

earnings

    

utilized

    

year

 

(in thousands)

Year 2019

$

494

6,448

(6,046)

896

Year 2020

$

896

 

8,791

 

(8,878)

 

809

Year 2021

$

809

 

13,632

(12,871)

 

1,570