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Accounts Receivable (Tables) | 12 Months Ended
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Dec. 31, 2016
Receivables [Abstract] |
Accounts Receivable, Net of Allowances | Accounts receivable, net of allowances, consisted of the following (in thousands):
| December 31,
| 2016 |  | 2015
Accounts receivable, net: |  |  |
Accounts receivable | $ | 91,596 |  |  | $ | 73,855 |
Less: allowance for doubtful accounts and sales returns | (4,831 | ) |  | (4,340 | )
Total | $ | 86,765 |  |  | $ | 69,515 |
Summary of Activity in Allowances for Doubtful Accounts, Returns and Discounts | The following is a summary of activity in allowances for doubtful accounts and sales returns for the three years ended December 31, 2016, 2015 and 2014 (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, |  |  |  |  |  |  |  |  |
2016 | $ | 4,340 |  |  | $ | 1,488 |  |  | $ | 1,100 |  |  | $ | (2,097 | ) |  | $ | 4,831 |
2015 | $ | 7,057 |  |  | $ | 1,826 |  |  | $ | 208 |  |  | $ | (4,751 | ) |  | $ | 4,340 |
2014 | $ | 8,214 |  |  | $ | 2,181 |  |  | $ | (238 | ) |  | $ | (3,100 | ) |  | $ | 7,057 |

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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://www.xbrl.org/2003/role/presentationRef -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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