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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | The following table summarizes the changes in the allowances for doubtful accounts and sales adjustments (in thousands):
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
Balance at beginning of year | $ | 4,647 |  |  | $ | 5,427 |  |  | $ | 3,396 |
Provisions for losses and sales adjustments - accounts receivable | 1,636 |  |  | (569 | ) |  | 2,031 |
Collection of accounts previously written off | (545 | ) |  | (211 | ) |  | — |
Balance at end of year | $ | 5,738 |  |  | $ | 4,647 |  |  | $ | 5,427 |
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | Amounts recognized at January 1, 2019, for operating leases were as follow (in thousands):
Operating lease right-of-use assets |  | $ | 15,633 |
Operating lease liabilities |  | (4,344 | )
Operating lease liabilities, long-term |  | (12,405 | )
Retained earnings |  | $ | (1,116 | )

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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=6877327&loc=d3e13212-122682 + Details
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