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Cash, Money Market Funds and Marketable Securities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Cash, Money Market Funds, and Marketable Securities
Cash and cash equivalents, Amortized Cost	$ 37,394	$ 187,026	$ 63,656	$ 69,485
Cash and cash equivalents, Fair Value	37,394	187,026
Marketable securities, Amortized Cost	189,807	143,222
Gross Unrealized Gain	66	134
Gross Unrealized Loss	(35)	(31)
Marketable securities, Fair Value	189,838	143,325
Cash and marketable securities, Amortized Cost	227,201	330,248
Cash and marketable securities, Fair Value	227,232	330,351
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	93,700	58,700
Other current liabilities
Cash, Money Market Funds, and Marketable Securities
Derivative liabilities	0	300
Other current liabilities | Foreign exchange forward contract | Not designated
Cash, Money Market Funds, and Marketable Securities
Derivative liabilities	0
Other expense | Foreign exchange forward contract | Not designated
Cash, Money Market Funds, and Marketable Securities
Gain (loss) on derivative instruments	200
Corporate debt securities
Cash, Money Market Funds, and Marketable Securities
Marketable securities, Amortized Cost	108,683	74,564
Gross Unrealized Gain	1	2
Gross Unrealized Loss	(35)	(31)
Marketable securities, Fair Value	108,649	74,535
Commercial paper
Cash, Money Market Funds, and Marketable Securities
Marketable securities, Amortized Cost	80,724	68,258
Gross Unrealized Gain	65	132
Marketable securities, Fair Value	80,789	68,390
Money market
Cash, Money Market Funds, and Marketable Securities
Marketable securities, Amortized Cost	350	350
Marketable securities, Fair Value	350	350
Certificate of deposit
Cash, Money Market Funds, and Marketable Securities
Marketable securities, Amortized Cost	50	50
Marketable securities, Fair Value	$ 50	$ 50

X

- 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.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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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.

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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.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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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.

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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.

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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.

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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