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Cash, Money Market Funds and Marketable Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Cash and cash equivalents, Amortized Cost |  | $ 187,026 | $ 69,485 | $ 24,074 | $ 43,640
Cash and cash equivalents, Fair Value |  | 187,026 | 69,485 |  |
Marketable securities, Fair Value current portion |  | 143,325 | 144,548 |  |
Marketable securities, Amortized Cost |  | 143,222 | 144,663 |  |
Unrealized Gain |  | 134 | 39 |  |
Unrealized Loss |  | (31) | (154) |  |
Marketable securities, Fair Value |  | 143,325 | 144,548 |  |
Cash and marketable securities, Amortized Cost |  | 330,248 | 214,148 |  |
Cash and marketable securities, Fair Value |  | 330,351 | 214,033 |  |
Available-for-sale investments |  |  |  |  |
Realized gain (loss) on securities available-for-sale |  | 0 | 0 |  |
Fair value of available for sale securities in unrealized loss positions |  | 58,700 | 118,500 |  |
Other current liabilities |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Derivative liabilities | $ 300 | 265 |  |  |
Other expense |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Gain (loss) on derivative instruments | $ (300) |  |  |  |
Short term corporate debt securities |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Marketable securities, Amortized cost current portion |  | 74,564 | 118,627 |  |
Unrealized Gain current portion |  | 2 | 1 |  |
Unrealized Loss current portion |  | (31) | (154) |  |
Marketable securities, Fair Value current portion |  | 74,535 | 118,474 |  |
Commercial paper |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Marketable securities, Amortized Cost |  | 68,258 | 25,686 |  |
Unrealized Gain |  | 132 | 38 |  |
Marketable securities, Fair Value |  | 68,390 | 25,724 |  |
Money market |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Marketable securities, Amortized Cost |  | 350 |  |  |
Marketable securities, Fair Value |  | 350 |  |  |
Certificate of deposit |  |  |  |  |
Cash, Money Market Funds, and Marketable Securities |  |  |  |  |
Marketable securities, Amortized Cost |  | 50 | 350 |  |
Marketable securities, Fair Value |  | $ 50 | $ 350 |  |

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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents cash and cash equivalents and short-term investments. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3044-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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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- 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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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