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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

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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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
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-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification
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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
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-URI http://asc.fasb.org/extlink&oid=6509036

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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