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Cash and Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and Cash Equivalents [Abstract] |  |
Restricted cash | $ 300 | $ 300
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 111,221 | 118,119
Unrealized Gain | 80 | 0
Unrealized Loss | 0 | 0
Estimated fair value | 111,301 | 118,119
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 46,220 | 79,634
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Estimated fair value | 46,220 | 79,634
Corporate bonds |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 20,219 | 16,119
Unrealized Gain | 37 | 0
Unrealized Loss | 0 | 0
Estimated fair value | 20,256 | 16,119
U.S. Treasury and agency obligations |  |
Cash and Cash Equivalents [Line Items] |  |
Amortized Cost | 44,782 | 22,366
Unrealized Gain | 43 | 0
Unrealized Loss | 0 | 0
Estimated fair value | 44,825 | 22,366
Money market funds |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 37,659 | 38,022
Commercial paper |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | 9,094 |
Cash equivalents |  |
Cash and Cash Equivalents [Line Items] |  |
Cash and cash equivalents | $ 46,753 | $ 38,022

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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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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