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Cash Equivalents and Marketable Securities - Schedule of Estimated Fair Value of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, amortized cost | $ 12,800 | $ 8,924
Cash equivalents, estimated fair value | 12,800 | 8,924
Marketable securities, amortized cost | 50,236 | 37,584
Marketable securities, gross unrealized gains | 2 |
Marketable securities, gross unrealized losses | (35) | (102)
Marketable securities, estimated fair value | 50,203 | 37,482
Money market funds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, amortized cost | 6,550 | 1,674
Cash equivalents, estimated fair value | 6,550 | 1,674
Reverse repurchase agreements |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Cash equivalents, amortized cost | 6,250 | 7,250
Cash equivalents, estimated fair value | 6,250 | 7,250
Commercial paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable securities, amortized cost | 32,236 |
Marketable securities, gross unrealized gains | 2 |
Marketable securities, gross unrealized losses | (8) |
Marketable securities, estimated fair value | 32,230 |
U.S. treasury securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable securities, amortized cost |  | 1,502
Marketable securities, gross unrealized losses |  | (1)
Marketable securities, estimated fair value |  | 1,501
U.S. government securities |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Marketable securities, amortized cost | 18,000 | 36,082
Marketable securities, gross unrealized losses | (27) | (101)
Marketable securities, estimated fair value | $ 17,973 | $ 35,981

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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 Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -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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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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