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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, 2015 | Dec. 31, 2014
--- | --- | ---
Cash equivalents |  |
Total cash equivalents | $ 35 | $ 2,114
Total assets at fair value | 1,302 |
Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 35 | 1,134
Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents |  | 980
Short-term investments |  |
Cash equivalents |  |
Short-term investments | 1,267 |
Level 1 |  |
Cash equivalents |  |
Total cash equivalents | 35 | 1,134
Total assets at fair value | 1,302 |
Level 1 | Money market funds |  |
Cash equivalents |  |
Total cash equivalents | 35 | 1,134
Level 1 | Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents |  | 0
Level 1 | Short-term investments |  |
Cash equivalents |  |
Short-term investments | $ 1,267 |
Level 2 |  |
Cash equivalents |  |
Total cash equivalents |  | 980
Level 2 | Money market funds |  |
Cash equivalents |  |
Total cash equivalents |  | 0
Level 2 | Certificates of deposit |  |
Cash equivalents |  |
Total cash equivalents |  | $ 980

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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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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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