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Marketable Securities and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value |  |
Less Than 12 Months | $ 50,578 | $ 53,351
12 Months or More | 1,500 | 0
Total | 52,078 | 53,351
Gross Unrealized Losses |  |
Less Than 12 Months | (33) | (64)
12 Months or More | (3) | 0
Total | (36) | (64)
Certificates of deposit |  |
Fair Value |  |
Less Than 12 Months | 5,500 |
12 Months or More | 0 |
Total | 5,500 |
Gross Unrealized Losses |  |
Less Than 12 Months | (1) |
12 Months or More | 0 |
Total | (1) |
Corporate securities |  |
Fair Value |  |
Less Than 12 Months | 27,254 | 28,537
12 Months or More | 1,500 | 0
Total | 28,754 | 28,537
Gross Unrealized Losses |  |
Less Than 12 Months | (10) | (42)
12 Months or More | (3) | 0
Total | (13) | (42)
U.S. Treasury and agency securities |  |
Fair Value |  |
Less Than 12 Months | 3,482 | 5,176
12 Months or More | 0 | 0
Total | 3,482 | 5,176
Gross Unrealized Losses |  |
Less Than 12 Months | (12) | (14)
12 Months or More | 0 | 0
Total | (12) | (14)
Commercial paper |  |
Fair Value |  |
Less Than 12 Months |  | 8,974
12 Months or More |  | 0
Total |  | 8,974
Gross Unrealized Losses |  |
Less Than 12 Months |  | (2)
12 Months or More |  | 0
Total |  | (2)
Asset-backed securities |  |
Fair Value |  |
Less Than 12 Months | 14,342 | 10,664
12 Months or More | 0 | 0
Total | 14,342 | 10,664
Gross Unrealized Losses |  |
Less Than 12 Months | (10) | (6)
12 Months or More | 0 | 0
Total | $ (10) | $ (6)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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