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Marketable Securities and Fair Value Measurements - Securities in Unrealized Loss Position (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | $ 58,922,000 | $ 53,351,000
Continuous loss position, Unrealized losses | (60,000) | (64,000)
Continuous loss position, fair value, more than 12 months | 0 |
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | 3,493,000 |
Continuous loss position, Unrealized losses | (7,000) |
Corporate securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | 32,236,000 | 28,537,000
Continuous loss position, Unrealized losses | (32,000) | (42,000)
U.S. Treasury and agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | 5,181,000 | 5,176,000
Continuous loss position, Unrealized losses | (10,000) | (14,000)
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | 5,482,000 | 8,974,000
Continuous loss position, Unrealized losses | 0 | (2,000)
Asset-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Continuous loss position, fair value | 12,530,000 | 10,664,000
Continuous loss position, Unrealized losses | $ (11,000) | $ (6,000)

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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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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + 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)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized 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)(1) -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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