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Available-for-Sale Securities and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Recurring basis |  |
Assets |  |
Total assets measured at estimated fair value | $ 228,292 | $ 108,974
Recurring basis | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 49,037 | 29,733
Recurring basis | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 19,927 | 4,971
Recurring basis | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value |  | 2,875
Recurring basis | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value | 38,747 | 22,037
Recurring basis | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 120,581 | 49,358
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 |  |
Assets |  |
Total assets measured at estimated fair value | 120,581 | 49,358
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 120,581 | 49,358
Recurring basis | Significant Other Observable Inputs, Level 2 |  |
Assets |  |
Total assets measured at estimated fair value | 107,711 | 59,616
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 49,037 | 29,733
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 19,927 | 4,971
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value |  | 2,875
Recurring basis | Significant Other Observable Inputs, Level 2 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value | 38,747 | 22,037
Recurring basis | Significant Other Observable Inputs, Level 2 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. government securities |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. government agencies |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. corporate notes |  |
Assets |  |
Total assets measured at estimated fair value |  | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | U.S. commercial paper |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Recurring basis | Significant Unobservable Inputs, Level 3 | Money market funds |  |
Assets |  |
Total assets measured at estimated fair value | 0 | 0
Nonrecurring basis | Debt |  |
Debt |  |
Term B Loan | 13,750 | 13,750
2023 Notes | 252,754 | 258,918
2025 Notes | 208,181 | 230,692
Total fair value of liabilities | 474,685 | 503,360
Nonrecurring basis | Quoted Price in Active Markets for Identical Assets, Level 1 | Debt |  |
Debt |  |
Term B Loan | 0 | 0
2023 Notes | 0 | 0
2025 Notes | 0 | 0
Total fair value of liabilities | 0 | 0
Nonrecurring basis | Significant Other Observable Inputs, Level 2 | Debt |  |
Debt |  |
Term B Loan | 13,750 | 13,750
2023 Notes | 252,754 | 258,918
2025 Notes | 208,181 | 230,692
Total fair value of liabilities | 474,685 | 503,360
Nonrecurring basis | Significant Unobservable Inputs, Level 3 | Debt |  |
Debt |  |
Term B Loan | 0 | 0
2023 Notes | 0 | 0
2025 Notes | 0 | 0
Total fair value of liabilities | $ 0 | $ 0

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- Definition Fair value portion of long-term notes 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. Senior debt has the highest claim on the assets of the issuer in case of bankruptcy or liquidation, due within one year or the normal operating cycle, if longer. Senior note holders are paid off in full before any payments are made to debt holders having a lesser priority of repayment. + References No definition available. + Details
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