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Short Term Investments - Schedule of Available for Sale Short-term Investments by Major Security Types (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale, Cost Total | $ 50,308 | $ 30,743
Available for sale, Unrealized gains | 65 | 26
Available for sale, Unrealized (losses) | (3) | (38)
Available for sale, Fair Value Total | 50,370 | 30,731
Available for sale, Maturity by period Less than 1 year | 50,370 | 30,731
Commercial Paper |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale, Cost Total | 47,831 | 22,538
Available for sale, Unrealized gains | 58 | 8
Available for sale, Unrealized (losses) | (3) | (27)
Available for sale, Fair Value Total | 47,886 | 22,519
Available for sale, Maturity by period Less than 1 year | 47,886 | 22,519
U.S. Treasury and Agency Bonds |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Available for sale, Cost Total | 2,477 | 8,205
Available for sale, Unrealized gains | 7 | 18
Available for sale, Unrealized (losses) |  | (11)
Available for sale, Fair Value Total | 2,484 | 8,212
Available for sale, Maturity by period Less than 1 year | $ 2,484 | $ 8,212

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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 This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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