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Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jul. 31, 2018
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of financial liabilities measured at fair value on a recurring basis	$ 585,000	$ 585,000
Changes in fair value of Level 3 liabilities	$ 0
3.5% Convertible Notes Due 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage	3.50%		3.50%
Fair value of convertible debt	$ 122,000,000	141,000,000
Carrying value of convertible debt	$ 150,314,000	$ 148,101,000	$ 143,723,000

X

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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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.

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- Definition

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

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- Definition

Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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