Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Option Indexed To Issuer's Equity

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Debt Instrument, Convertible, Issuance Costs of Equity Component

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Debt Issuance Costs, Net, Liability Component

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Option Indexed to Issuers' Equity, Cap Price

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract.

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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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Convertible Senior Notes and Capped Calls - Additional Information (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2018 USD ($) day $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Equity component of convertible debt, subsequent adjustments	$ 26,910,000
Call Option [Member]
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares	$ 41.59
Cap price (in dollars per share) \| $ / shares	$ 63.98
Option indexed to issuer's equity (in shares) \| shares	5.5
Equity component of convertible debt, subsequent adjustments			$ 26,900,000
The Notes [Member]
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares			$ 41.59
Convertible Debt [Member] \| The Notes, Due 2023 [Member]
Debt Instrument [Line Items]
Face amount	$ 200,000,000.0
Interest rate		1.25%	1.25%
Convertible Debt [Member] \| The Notes, Over-allotment Option [Member]
Debt Instrument [Line Items]
Face amount	$ 30,000,000.0
Convertible Debt [Member] \| The Notes [Member]
Debt Instrument [Line Items]
Interest rate	1.25%
Proceeds from convertible debt	$ 223,100,000
Conversion ratio (in shares per $1000)	0.024046
Conversion price (in dollars per share) \| $ / shares	$ 41.59
Redemption price, percentage	100.00%
Carrying amount of equity component	$ 53,800,000	$ 52,194,000	$ 52,194,000	$ 52,194,000
Convertible debt		179,791,000	179,791,000	174,688,000
Amortization of debt discount		2,361,000	4,645,000
Converted instrument, rate	7.37%
Debt issuance costs, net	$ 6,900,000	$ 4,519,000	$ 4,519,000	$ 4,978,000
Liability component	5,300,000
Issuance costs of equity component	$ 1,600,000
Debt Covenant One [Member] \| Convertible Debt [Member] \| The Notes [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
Threshold percentage of stock price trigger	130.00%
Debt Covenant Two [Member] \| Convertible Debt [Member] \| The Notes [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	5
Threshold percentage of stock price trigger	98.00%
Debt Covenant Three [Member] \| Convertible Debt [Member] \| The Notes [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
Threshold percentage of stock price trigger	130.00%
Redemption price, percentage	100.00%