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Cash Equivalents and Investments - Schedule of Securities Classified as Cash, Cash Equivalents and Short-term Investments (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Cash and cash equivalents, Amortized Cost | $ 91,751 | $ 75,383 | [1] | $ 63,636 | $ 74,598
Cash and cash equivalents, at Carrying Value | 91,751 |  |  |  |
Cash and cash equivalents, Fair Value | 91,751 | 75,383 |  |  |
Short-term investments, Amortized Cost | 121,015 | 58,640 |  |  |
Short-term investments, Gross Unrealized Gains | 1 |  |  |  |
Short-term investments, Gross Unrealized Losses | (36) | (47) |  |  |
Short-term investments, Fair Value | 120,980 | 58,593 |  |  |
Cash equivalents and short-term investments, Amortized Cost | 212,766 | 134,023 |  |  |
Cash equivalents and short-term investments, Gross Unrealized Gains | 1 |  |  |  |
Cash equivalents and short-term investments, Gross Unrealized Losses | (36) | (47) |  |  |
Cash equivalents and short-term investments, Fair Value | 212,731 | 133,976 |  |  |
Cash [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Cash and cash equivalents, Amortized Cost | 2,932 | 5,882 |  |  |
Cash and cash equivalents, Fair Value | 2,932 | 5,882 |  |  |
Money Market Funds [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Cash and cash equivalents, Amortized Cost | 67,611 | 68,651 |  |  |
Cash and cash equivalents, Fair Value | 67,611 | 68,651 |  |  |
Corporate Bonds [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Cash and cash equivalents, Amortized Cost | 2,664 |  |  |  |
Cash and cash equivalents, Fair Value | 2,664 |  |  |  |
Commercial Paper (Cash Equivalents) [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Cash and cash equivalents, Amortized Cost | 18,544 | 850 |  |  |
Cash and cash equivalents, Fair Value | 18,544 | 850 |  |  |
U.S. Treasury Securities [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Short-term investments, Amortized Cost | 8,459 | 3,994 |  |  |
Short-term investments, Gross Unrealized Gains | 1 |  |  |  |
Short-term investments, Gross Unrealized Losses |  | (1) |  |  |
Short-term investments, Fair Value | 8,460 | 3,993 |  |  |
Corporate Bonds [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Short-term investments, Amortized Cost | 38,788 | 26,853 |  |  |
Short-term investments, Gross Unrealized Losses | (31) | (26) |  |  |
Short-term investments, Fair Value | 38,757 | 26,827 |  |  |
Commercial Paper (Investments) [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Short-term investments, Amortized Cost | 64,642 | 19,584 |  |  |
Short-term investments, Gross Unrealized Losses | (2) | (14) |  |  |
Short-term investments, Fair Value | 64,640 | 19,570 |  |  |
Asset-Backed Securities [Member] |  |  |  |  |
Cash Cash Equivalents And Short Term Investments [Line Items] |  |  |  |  |
Short-term investments, Amortized Cost | 9,126 | 8,209 |  |  |
Short-term investments, Gross Unrealized Losses | (3) | (6) |  |  |
Short-term investments, Fair Value | $ 9,123 | $ 8,203 |  |  |
[1] | Derived from the audited consolidated financial statements included in the Company’s Annual Report on Form 10K for the year ended December 31, 2017.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + 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=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: 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=98514028&loc=d3e3044-108585 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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- 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 -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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