Significant Accounting Policies - Schedule of Changes to Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Receivables [Abstract] | |||
| Allowance for doubtful accounts, beginning of period | $ 7,602 | $ 2,490 | $ 704 |
| Additional provisions for the year | 1,512 | 5,112 | 1,786 |
| Allowance for doubtful accounts, end of period | $ 9,114 | $ 7,602 | $ 2,490 |
| 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
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| 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
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| X | ||||||||||
- References No definition available.
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