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Fair Value Measurements - Financial Instruments (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other expense, net | $ 6,142 | $ 62 | $ 908
Financial Assets: |  |  |
Cash Equivalents | 117,138 |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 1,104 |
Level I |  |  |
Financial Assets: |  |  |
Cash Equivalents | 117,138 |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 0 |
Level II |  |  |
Financial Assets: |  |  |
Cash Equivalents | 0 |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 0 |
Level III |  |  |
Financial Assets: |  |  |
Cash Equivalents | 0 |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 1,104 |
Money market funds |  |  |
Financial Assets: |  |  |
Cash Equivalents | 117,138 |  |
Money market funds | Level I |  |  |
Financial Assets: |  |  |
Cash Equivalents | 117,138 |  |
Money market funds | Level II |  |  |
Financial Assets: |  |  |
Cash Equivalents | 0 |  |
Money market funds | Level III |  |  |
Financial Assets: |  |  |
Cash Equivalents | 0 |  |
Redeemable convertible preferred stock warrant liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other expense, net | $ 6,100 | 100 | $ 100
Financial Liabilities: |  |  |
Total financial liabilities |  | 1,104 |
Redeemable convertible preferred stock warrant liability | Level I |  |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 0 |
Redeemable convertible preferred stock warrant liability | Level II |  |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | 0 |
Redeemable convertible preferred stock warrant liability | Level III |  |  |
Financial Liabilities: |  |  |
Total financial liabilities |  | $ 1,104 |

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- Definition 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. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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