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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, 2015 | Jun. 10, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Cash equivalents |  |  |
Fair value of debt | $ 78,200 |  |
Convertible Debt |  |  |
Cash equivalents |  |  |
Principal | 120,000 | $ 120,000 |
Stated interest rate of debt issued |  | 5.50% |
Fair Value, Measurements, Recurring |  |  |
Cash equivalents |  |  |
Total cash equivalents | 9,932 |  | $ 2,114
Fair Value, Measurements, Recurring | Money market funds |  |  |
Cash equivalents |  |  |
Total cash equivalents | 9,932 |  | 1,134
Fair Value, Measurements, Recurring | Certificates of deposit |  |  |
Cash equivalents |  |  |
Total cash equivalents |  |  | 980
Fair Value, Measurements, Recurring | Level 1 |  |  |
Cash equivalents |  |  |
Total cash equivalents | 9,932 |  | 1,134
Fair Value, Measurements, Recurring | Level 1 | Money market funds |  |  |
Cash equivalents |  |  |
Total cash equivalents | $ 9,932 |  | 1,134
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit |  |  |
Cash equivalents |  |  |
Total cash equivalents |  |  | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |
Cash equivalents |  |  |
Total cash equivalents |  |  | 980
Fair Value, Measurements, Recurring | Level 2 | Money market funds |  |  |
Cash equivalents |  |  |
Total cash equivalents |  |  | 0
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit |  |  |
Cash equivalents |  |  |
Total cash equivalents |  |  | $ 980

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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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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