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Fair Value Measurements - Summary of Cash, Cash Equivalents and Short-Term Investments (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, amortized cost and estimated fair value | $ 2,936 |
Cash and cash equivalents, amortized cost and estimated fair value | 11,755 | $ 5,284
Restricted cash, amortized cost and estimated fair value | 50 |
Short-term investments, amortized cost and estimated fair value | 1,390 |
Money market securities [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash equivalents, amortized cost and estimated fair value | 8,819 |
Restricted cash, amortized cost and estimated fair value | 50 |
Corporate bonds and commercial paper [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Short-term investments, amortized cost and estimated fair value | $ 1,390 |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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