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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 ($)	Sep. 30, 2015	Jun. 10, 2015	Dec. 31, 2014
Cash equivalents
Fair value of debt	$ 80,400,000
Convertible Debt
Cash equivalents
Principal	120,000,000	$ 120,000,000.0
Stated interest rate of debt issued		5.50%
Fair Value, Measurements, Recurring
Cash equivalents
Cash equivalents	2,935,000		$ 2,114,000
Fair Value, Measurements, Recurring | Money market funds
Cash equivalents
Cash equivalents	2,935,000		1,134,000
Fair Value, Measurements, Recurring | Certificates of deposit
Cash equivalents
Cash equivalents			980,000
Fair Value, Measurements, Recurring | Level 1
Cash equivalents
Cash equivalents	2,935,000		1,134,000
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Cash equivalents
Cash equivalents	$ 2,935,000		1,134,000
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit
Cash equivalents
Cash equivalents			0
Fair Value, Measurements, Recurring | Level 2
Cash equivalents
Cash equivalents			980,000
Fair Value, Measurements, Recurring | Level 2 | Money market funds
Cash equivalents
Cash equivalents			0
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit
Cash equivalents
Cash equivalents			$ 980,000

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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.

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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.

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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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