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Fair Value Disclosures - Schedule of Short-Term Investments (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term Investments, Amortized Cost | $ 21,939 | $ 32,914
Short-term Investments, Gross Unrealized Holding Gains | 0 | 0
Short-term Investments, Gross Unrealized Holding Losses | (23) | (7)
Short-term Investments, Fair Value | $ 21,916 | $ 32,907
Available-for-sale securities, maturity period | 1 year | 1 year
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Short-term Investments, Amortized Cost | $ 21,939 | $ 32,914
Short-term Investments, Gross Unrealized Holding Gains | 0 | 0
Short-term Investments, Gross Unrealized Holding Losses | (23) | (7)
Short-term Investments, Fair Value | $ 21,916 | $ 32,907

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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