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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2020
Receivables [Abstract] |
Accounts Receivable, Net of Allowances | Accounts receivable, net of allowances, consisted of the following:
| As of December 31, |  |
(in thousands) | 2020 |  | 2019 |  |
Accounts receivable, net: |  |  |  |  |
Accounts receivable | $ | 68,295 |  |  | $ | 91,513 |  |  |
Less: allowance for doubtful accounts and sales returns | (2,068) |  |  | (3,013) |  |  |
Total | $ | 66,227 |  |  | $ | 88,500 |  |  |
Allowance for for doubtful accounts and sales returns | The following table is a summary of activities in allowances for doubtful accounts and sales returns:
(in thousands) | Balance at Beginning of Period |  | Charges to Revenue |  | Charges (Credits) to Expense |  | Additions to (Deductions from) Reserves |  | Balance at End of Period
Year ended December 31, |  |  |  |  |  |  |  |  |
2020 | $ | 3,013 |  |  | $ | 1,367 |  |  | $ | 299 |  |  | $ | (2,611) |  |  | $ | 2,068 |
2019 | $ | 3,497 |  |  | $ | 1,896 |  |  | $ | (396) |  |  | $ | (1,984) |  |  | $ | 3,013 |
2018 | $ | 4,631 |  |  | $ | 1,949 |  |  | $ | 572 |  |  | $ | (3,655) |  |  | $ | 3,497 |

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- Definition Tabular disclosure of allowance for credit loss on financing receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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