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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Cash equivalents |  |
Total cash equivalents | $ 35 | $ 35
Total assets at fair value |  | 1,302
Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 35 | 35
Short-term investments |  |
Cash equivalents |  |
Short-term investments |  | 1,267
Level 1 |  |
Cash equivalents |  |
Total cash equivalents | 35 | 35
Total assets at fair value |  | 1,302
Level 1 | Money market funds |  |
Cash equivalents |  |
Total cash equivalents | $ 35 | 35
Level 1 | Short-term investments |  |
Cash equivalents |  |
Short-term investments |  | $ 1,267

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- Definition Fair value portion 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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