Fair Value Measurements - Schedule of Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Adjusted Amortized Cost
Cash and cash equivalents	$ 218,228	$ 241,738	$ 54,996
Certificate of deposit	150,000	150,000
Total cash, cash equivalents and short-term investments	368,228	391,738
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value
Cash equivalents and cash equivalents, fair value	218,228	241,738
Total cash, and cash equivalents	150,000	150,000
Total cash, cash equivalents and short-term investments	368,228	391,738
Cash
Adjusted Amortized Cost
Cash and cash equivalents	112,662	111,098
Fair Value
Cash equivalents and cash equivalents, fair value	112,662	111,098
Money market funds
Adjusted Amortized Cost
Cash and cash equivalents	105,566	130,640
Fair Value
Cash equivalents and cash equivalents, fair value	105,566	130,640
Certificate of deposit
Adjusted Amortized Cost
Certificate of deposit	150,000	150,000
Gross Unrealized Gains	0
Gross Unrealized Losses	0	0
Fair Value
Total cash, and cash equivalents	$ 150,000	$ 150,000

Cash, Cash Equivalents, And Short-Term Investments, Fair Value Disclosure

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Cash and Cash Equivalents, Fair Value Disclosure [Abstract]

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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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Amortized cost 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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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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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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