Fair Value Measurements - Summary of Financial Assets Measured and Recorded at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets:
Available-for-sale securities	$ 113,129	$ 148,963
The Notes, Due 2023 \| Convertible Debt
Liabilities:
Interest Rate	1.25%
Convertible debt, fair value	$ 86,800
The Notes, Due 2025 \| Convertible Debt
Liabilities:
Interest Rate	2.25%
Convertible debt, fair value	$ 325,900
The Notes, Due 2027 \| Convertible Debt
Liabilities:
Interest Rate	0.25%
Convertible debt, fair value	$ 583,900
Fair Value, Recurring
Assets:
Foreign currency forward contracts designated as cash flow hedges (prepaid expenses and other current assets)	226	432
Total	577,531	301,965
Liabilities:
Foreign currency forward contracts designated as cash flow hedges (other current liabilities)	128
Total	128
Level 1 \| Fair Value, Recurring
Assets:
Foreign currency forward contracts designated as cash flow hedges (prepaid expenses and other current assets)	0	0
Total	519,569	236,157
Liabilities:
Foreign currency forward contracts designated as cash flow hedges (other current liabilities)	0
Total	0
Level 2 \| Fair Value, Recurring
Assets:
Foreign currency forward contracts designated as cash flow hedges (prepaid expenses and other current assets)	226	432
Total	57,962	65,808
Liabilities:
Foreign currency forward contracts designated as cash flow hedges (other current liabilities)	128
Total	128
Level 3 \| Fair Value, Recurring
Assets:
Foreign currency forward contracts designated as cash flow hedges (prepaid expenses and other current assets)	0	0
Total	0	0
Liabilities:
Foreign currency forward contracts designated as cash flow hedges (other current liabilities)	0
Total	0
U.S. Government Agencies
Assets:
Available-for-sale securities	55,393	83,587
U.S. Government Agencies \| Fair Value, Recurring
Assets:
Available-for-sale securities	55,393	83,587
U.S. Government Agencies \| Level 1 \| Fair Value, Recurring
Assets:
Available-for-sale securities	55,393	83,587
U.S. Government Agencies \| Level 2 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
U.S. Government Agencies \| Level 3 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Commercial Paper
Assets:
Available-for-sale securities	27,676	34,766
Commercial Paper \| Fair Value, Recurring
Assets:
Available-for-sale securities	27,676	34,766
Commercial Paper \| Level 1 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Commercial Paper \| Level 2 \| Fair Value, Recurring
Assets:
Available-for-sale securities	27,676	34,766
Commercial Paper \| Level 3 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Corporate Bonds
Assets:
Available-for-sale securities	27,657	24,192
Corporate Bonds \| Fair Value, Recurring
Assets:
Available-for-sale securities	27,657	24,192
Corporate Bonds \| Level 1 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Corporate Bonds \| Level 2 \| Fair Value, Recurring
Assets:
Available-for-sale securities	27,657	24,192
Corporate Bonds \| Level 3 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Agency Bonds
Assets:
Available-for-sale securities		3,999
Agency Bonds \| Fair Value, Recurring
Assets:
Available-for-sale securities		3,999
Agency Bonds \| Level 1 \| Fair Value, Recurring
Assets:
Available-for-sale securities		0
Agency Bonds \| Level 2 \| Fair Value, Recurring
Assets:
Available-for-sale securities		3,999
Agency Bonds \| Level 3 \| Fair Value, Recurring
Assets:
Available-for-sale securities		0
Asset-backed Securities
Assets:
Available-for-sale securities	2,403	2,419
Asset-backed Securities \| Fair Value, Recurring
Assets:
Available-for-sale securities	2,403	2,419
Asset-backed Securities \| Level 1 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Asset-backed Securities \| Level 2 \| Fair Value, Recurring
Assets:
Available-for-sale securities	2,403	2,419
Asset-backed Securities \| Level 3 \| Fair Value, Recurring
Assets:
Available-for-sale securities	0	0
Money Market Funds \| Fair Value, Recurring
Assets:
Money market funds	464,176	152,570
Money Market Funds \| Level 1 \| Fair Value, Recurring
Assets:
Money market funds	464,176	152,570
Money Market Funds \| Level 2 \| Fair Value, Recurring
Assets:
Money market funds	0	0
Money Market Funds \| Level 3 \| Fair Value, Recurring
Assets:
Money market funds	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial and nonfinancial obligations.

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