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Investments and Fair Value Measurements Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: | $ 0 | $ 318,202
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 67,890 | 590,684
Fair Value, Measurements, Recurring | Cash Equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents: | 36,683 | 236,923
Fair Value, Measurements, Recurring | Short-term Investments | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 211,006
Fair Value, Measurements, Recurring | Short-term Investments | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 14,426
Fair Value, Measurements, Recurring | Short-term Investments | U.S. government treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 70,650
Fair Value, Measurements, Recurring | Short-term Investments | U.S. government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 22,101
Fair Value, Measurements, Recurring | Short-term Investments | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 19
Fair Value, Measurements, Recurring | Prepaid expenses and other current assets: | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: | 27,914 | 25,005
Fair Value, Measurements, Recurring | Prepaid expenses and other current assets: | Israeli Severance Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds | 3,293 | 3,226
Fair Value, Measurements, Recurring | Other Assets | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: |  | 7,328
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 36,683 | 307,573
Fair Value, Measurements, Recurring | Level 1 | Cash Equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents: | 36,683 | 236,923
Fair Value, Measurements, Recurring | Level 1 | Short-term Investments | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 1 | Short-term Investments | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 1 | Short-term Investments | U.S. government treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 70,650
Fair Value, Measurements, Recurring | Level 1 | Short-term Investments | U.S. government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 1 | Short-term Investments | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 1 | Prepaid expenses and other current assets: | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Prepaid expenses and other current assets: | Israeli Severance Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Other Assets | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: |  | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 3,293 | 250,778
Fair Value, Measurements, Recurring | Level 2 | Cash Equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents: | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Short-term Investments | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 211,006
Fair Value, Measurements, Recurring | Level 2 | Short-term Investments | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 14,426
Fair Value, Measurements, Recurring | Level 2 | Short-term Investments | U.S. government treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 2 | Short-term Investments | U.S. government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 22,101
Fair Value, Measurements, Recurring | Level 2 | Short-term Investments | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 19
Fair Value, Measurements, Recurring | Level 2 | Prepaid expenses and other current assets: | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | Prepaid expenses and other current assets: | Israeli Severance Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds | 3,293 | 3,226
Fair Value, Measurements, Recurring | Level 2 | Other Assets | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: |  | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 27,914 | 32,333
Fair Value, Measurements, Recurring | Level 3 | Cash Equivalents | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents: | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Short-term Investments | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 3 | Short-term Investments | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 3 | Short-term Investments | U.S. government treasury bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 3 | Short-term Investments | U.S. government agency bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 3 | Short-term Investments | Certificates of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments: |  | 0
Fair Value, Measurements, Recurring | Level 3 | Prepaid expenses and other current assets: | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: | 27,914 | 25,005
Fair Value, Measurements, Recurring | Level 3 | Prepaid expenses and other current assets: | Israeli Severance Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds | $ 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Other Assets | Current unsecured promissory note |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Other assets: |  | $ 7,328

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