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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Financial Instruments | The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:
|  | December 31, |  |  | December 31, |
|  | 2017 |  |  | 2018 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | amount |  |  | value |  |  | amount |  |  | value |
Cash and cash equivalents |  | $ | 29,655 |  |  | $ | 29,655 |  |  | $ | 45,414 |  |  | $ | 45,414 |
Accounts receivable, net |  |  | 10,446 |  |  |  | 10,446 |  |  |  | 12,140 |  |  |  | 12,140 |
Accounts payable |  |  | 2,272 |  |  |  | 2,272 |  |  |  | 3,236 |  |  |  | 3,236 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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