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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Adjustments in Allowances for Doubtful Accounts and Sales Adjustments | The following table summarizes the changes in the allowances for doubtful accounts and sales adjustments:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Balance at beginning of year | $ | 3,396 |  |  | $ | 1,640 |  |  | $ | 1,725 |
Provisions for losses - accounts receivable | 4,110 |  |  | 4,484 |  |  | 1,756 |
Collection of accounts previously written off | — |  |  | — |  |  | 153 |
Deductions for accounts charged off or credits issued | (2,079 | ) |  | (2,728 | ) |  | (1,994 | )
Balance at end of year | $ | 5,427 |  |  | $ | 3,396 |  |  | $ | 1,640 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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