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Fair Value of Financial Instruments - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable securities | $ 42,068 | $ 30,991
Fair Value Measurements Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 208,435 | 173,970
Gross unrealized gains/(losses) | (23) | (26)
Fair value | 208,412 | 173,944
Cash and cash equivalents | 166,344 | 142,953
Marketable securities | 42,068 | 30,991
Fair Value Measurements Recurring | Cash |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 45,660 | 46,237
Fair value | 45,660 | 46,237
Cash and cash equivalents | 45,660 | 46,237
Fair Value Measurements Recurring | Level 1 | Money Market Accounts |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 120,684 | 93,430
Fair value | 120,684 | 93,430
Cash and cash equivalents | 120,684 | 93,430
Fair Value Measurements Recurring | Level 2 | Certificates Of Deposit |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 1,476 | 11,010
Gross unrealized gains/(losses) | (1) | (4)
Fair value | 1,475 | 11,006
Cash and cash equivalents |  | 490
Marketable securities | 1,475 | 10,516
Fair Value Measurements Recurring | Level 2 | Corporate Bonds |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 18,141 | 20,789
Gross unrealized gains/(losses) | (27) | (21)
Fair value | 18,114 | 20,768
Cash and cash equivalents |  | 2,796
Marketable securities | 18,114 | 17,972
Fair Value Measurements Recurring | Level 2 | Agency Mortgage-backed Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost |  | 2,005
Gross unrealized gains/(losses) |  | (1)
Fair value |  | 2,004
Marketable securities |  | 2,004
Fair Value Measurements Recurring | Level 2 | U.S. Treasury Securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Adjusted cost | 22,474 | 499
Gross unrealized gains/(losses) | 5 |
Fair value | 22,479 | 499
Marketable securities | $ 22,479 | $ 499

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- Definition Cash cash equivalents and short term investments amortized cost. + References No definition available. + Details
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- Definition Amount before tax of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26626-111562 + 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 No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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