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Fair Value of Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities | The following table summarizes fair value measurements by level for the assets measured at fair value on a recurring basis for cash, cash equivalents and marketable securities:
|  | As of June 30, 2018 |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Cash |  |  |  |  |
|  | Adjusted |  |  | unrealized |  |  |  |  |  |  | and cash |  |  | Marketable |
|  | cost |  |  | gains/(losses) |  |  | Fair value |  |  | equivalents |  |  | securities |
Cash |  | $ | 45,660 |  |  | $ | — |  |  | $ | 45,660 |  |  | $ | 45,660 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  |  | 120,684 |  |  |  | — |  |  |  | 120,684 |  |  |  | 120,684 |  |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 1,476 |  |  |  | (1 | ) |  |  | 1,475 |  |  |  | — |  |  |  | 1,475 |
Corporate bonds |  |  | 18,141 |  |  |  | (27 | ) |  |  | 18,114 |  |  |  | — |  |  |  | 18,114 |
U.S. Treasury securities |  |  | 22,474 |  |  |  | 5 |  |  |  | 22,479 |  |  |  | — |  |  |  | 22,479 |
Total |  | $ | 208,435 |  |  | $ | (23 | ) |  | $ | 208,412 |  |  | $ | 166,344 |  |  | $ | 42,068 |
|  | As of December 31, 2017 |
|  |  |  |  |  | Gross |  |  |  |  |  |  | Cash |  |  |  |  |
|  | Adjusted |  |  | unrealized |  |  |  |  |  |  | and cash |  |  | Marketable |
|  | cost |  |  | losses |  |  | Fair value |  |  | equivalents |  |  | securities |
Cash |  | $ | 46,237 |  |  | $ | — |  |  | $ | 46,237 |  |  | $ | 46,237 |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market accounts |  |  | 93,430 |  |  |  | — |  |  |  | 93,430 |  |  |  | 93,430 |  |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 11,010 |  |  |  | (4 | ) |  |  | 11,006 |  |  |  | 490 |  |  |  | 10,516 |
Corporate bonds |  |  | 20,789 |  |  |  | (21 | ) |  |  | 20,768 |  |  |  | 2,796 |  |  |  | 17,972 |
Agency mortgage-backed securities |  |  | 2,005 |  |  |  | (1 | ) |  |  | 2,004 |  |  |  | — |  |  |  | 2,004 |
U.S. Treasury securities |  |  | 499 |  |  |  | — |  |  |  | 499 |  |  |  | — |  |  |  | 499 |
Total |  | $ | 173,970 |  |  | $ | (26 | ) |  | $ | 173,944 |  |  | $ | 142,953 |  |  | $ | 30,991 |
Summary of Estimated Fair Value of Company's Investments in Marketable Debt Securities, Accounted for as Available-for-Sale Securities | The following table summarizes the estimated fair value of the Company’s investments in marketable securities, accounted for as available-for-sale securities and classified by the contractual maturity date of the securities:
|  | June 30, 2018 |
Due within one year |  | $ | 42,068 |
Summary of Components of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income were as follows:
|  | Foreign |  |  | Unrealized |  |  | Unrealized |  |  | Accumulated |
|  | currency |  |  | losses on |  |  | gains (losses) |  |  | other |
|  | translation |  |  | available-for- |  |  | on cash |  |  | comprehensive |
|  | adjustments |  |  | sale investments |  |  | flow hedges |  |  | income |
Balance as of December 31, 2017 |  | $ | 363 |  |  | $ | (17 | ) |  | $ | (74 | ) |  | $ | 272 |
Other comprehensive gain |  |  | 184 |  |  |  | — |  |  |  | 543 |  |  |  | 727 |
Balance as of June 30, 2018 |  | $ | 547 |  |  | $ | (17 | ) |  | $ | 469 |  |  | $ | 999 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References No definition available. + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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