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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 10, 2015
--- | --- | --- | ---
Convertible Debt |  |  |
Cash equivalents |  |  |
Principal | $ 120,000 |  | $ 120,000
Stated interest rate of debt issued |  |  | 5.50%
Fair Value, Measurements, Recurring |  |  |
Cash equivalents |  |  |
Cash equivalents | 35 | $ 35 |
Assets, Fair Value Disclosure, Recurring |  | 1,302 |
Fair Value, Measurements, Recurring | Money market funds |  |  |
Cash equivalents |  |  |
Cash equivalents | 35 | 35 |
Fair Value, Measurements, Recurring | Short-term investments |  |  |
Cash equivalents |  |  |
Short-term investments |  | 1,267 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Cash equivalents |  |  |
Cash equivalents | 35 | 35 |
Assets, Fair Value Disclosure, Recurring |  | 1,302 |
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |  |
Cash equivalents |  |  |
Cash equivalents | 35 | 35 |
Fair Value, Measurements, Recurring | Level 1 | Short-term investments |  |  |
Cash equivalents |  |  |
Short-term investments |  | $ 1,267 |
Fair Value, Measurements, Nonrecurring |  |  |
Cash equivalents |  |  |
Fair value of debt | $ 86,700 |  |

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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 borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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