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Cash, Cash Equivalents, Marketable Securities, and Restricted Cash - Components (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Cash, Money Market Funds, and Marketable Securities |  |  |
Cash and cash equivalents | $ 235,639 | $ 245,197 | $ 176,538
Fair value, cash balances | 235,639 | 245,197 |
Cost, available-for-sale securities | 151,642 | 237,371 |
Gross unrealized gain, available-for-sale securities | 1 | 7 |
Gross unrealized loss, available-for-sale securities | (441) | (79) |
Fair value, available-for-sale debt securities | 151,202 | 237,299 |
Cost, cash balances and available-for-sale securities | 387,281 | 482,568 |
Gross unrealized gain, cash balances and available-for-sale securities | 1 | 7 |
Gross unrealized loss, cash balances and available-for-sale securities | (441) | (79) |
Fair value, cash balances and available-for-sale securities | 386,841 | 482,496 |
Commercial paper |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, cost | 103,084 |  |
Corporate debt securities, gross unrealized gain | 1 |  |
Corporate debt securities, gross unrealized loss | (239) |  |
Corporate debt securities, fair value | 102,846 |  |
Cost, available-for-sale securities |  | 174,578 |
Gross unrealized gain, available-for-sale securities |  | 7 |
Gross unrealized loss, available-for-sale securities |  | (54) |
Fair value, available-for-sale debt securities |  | 174,531 |
U.S. government agency bonds |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Cost, available-for-sale securities | 45,157 |  |
Gross unrealized gain, available-for-sale securities | 0 |  |
Gross unrealized loss, available-for-sale securities | (193) |  |
Fair value, available-for-sale debt securities | 44,964 |  |
Asset-backed securities |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, cost | 3,000 | 30,070 |
Corporate debt securities, gross unrealized gain | 0 | 0 |
Corporate debt securities, gross unrealized loss | (9) | (14) |
Corporate debt securities, fair value | 2,991 | 30,056 |
Money market |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, cost | 350 |  |
Corporate debt securities, gross unrealized gain | 0 |  |
Corporate debt securities, gross unrealized loss | 0 |  |
Corporate debt securities, fair value | 350 |  |
Cost, available-for-sale securities |  | 350 |
Gross unrealized gain, available-for-sale securities |  | 0 |
Gross unrealized loss, available-for-sale securities |  | 0 |
Fair value, available-for-sale debt securities |  | 350 |
Corporate debt securities |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Corporate debt securities, cost |  | 32,322 |
Corporate debt securities, gross unrealized gain |  | 0 |
Corporate debt securities, gross unrealized loss |  | (11) |
Corporate debt securities, fair value |  | 32,311 |
Certificate of deposit |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |
Cost, available-for-sale securities | 51 | 51 |
Gross unrealized gain, available-for-sale securities | 0 | 0 |
Gross unrealized loss, available-for-sale securities | 0 | 0 |
Fair value, available-for-sale debt securities | $ 51 | $ 51 |

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- Definition 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. Also includes amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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