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Short-Term Investments - Summary of Short-Term Investments (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 6,928 | $ 26,656
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (52)
Total short-term investments, Estimated Fair Value | 6,923 | 26,604
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 6,928 | 25,557
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (52)
Total short-term investments, Estimated Fair Value | $ 6,923 | 25,505
Commercial paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost |  | 1,099
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Total short-term investments, Estimated Fair Value |  | $ 1,099

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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=73527792&loc=d3e27161-111563 + Details
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