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Cash Equivalents and Investments - Available for Sale securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | $ 150,017 | $ 61,009
Available-for-sale securities, unrealized gains | 0 | 0
Available-for-sale securities, unrealized losses | (101) | (51)
Available-for-sale securities, fair value | 149,916 | 60,958
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 31,749 | 46,133
Available-for-sale securities, unrealized gains | 0 | 0
Available-for-sale securities, unrealized losses | (55) | (35)
Available-for-sale securities, fair value | 31,694 | 46,098
Government notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 12,448 | 6,191
Available-for-sale securities, unrealized gains | 0 | 0
Available-for-sale securities, unrealized losses | (18) | (16)
Available-for-sale securities, fair value | 12,430 | 6,175
Asset backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 12,226 |
Available-for-sale securities, unrealized gains | 0 |
Available-for-sale securities, unrealized losses | (28) |
Available-for-sale securities, fair value | 12,198 |
Money market funds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 9,850 | 8,685
Available-for-sale securities, unrealized gains | 0 | 0
Available-for-sale securities, unrealized losses | 0 | 0
Available-for-sale securities, fair value | 9,850 | $ 8,685
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities, amortized cost | 83,744 |
Available-for-sale securities, unrealized gains | 0 |
Available-for-sale securities, unrealized losses | 0 |
Available-for-sale securities, fair value | $ 83,744 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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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