Summary of Significant Accounting Policies - Summary of Changes in the Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract] | |||
| Beginning balance | $ 323 | $ 262 | $ 631 |
| Provision for doubtful accounts | 419 | 67 | 647 |
| Write-offs | (6) | (1,016) | |
| Ending balance | $ 742 | $ 323 | $ 262 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|