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Fair Value of Financial Instruments (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Cash and Cash Equivalents, Available-for-sale Securities Reconciliation | The Company's cash and cash equivalents, short-term investments, and long-term investments consist of the following:
| September 30, 2017
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (in thousands)
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 90,472 |  |  | $ | — |  |  | $ | — |  |  | $ | 90,472 |
Money market funds | 45 |  |  | — |  |  | — |  |  | 45 |
Total | 90,517 |  |  | — |  |  | — |  |  | 90,517 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 20,930 |  |  | 4 |  |  | (1 | ) |  | 20,933 |
Corporate bonds | 31,786 |  |  | 3 |  |  | (22 | ) |  | 31,767 |
Asset-backed securities | 491 |  |  | — |  |  | — |  |  | 491 |
U.S. government agencies | 159,135 |  |  | 3 |  |  | (119 | ) |  | 159,019 |
Total | 212,342 |  |  | 10 |  |  | (142 | ) |  | 212,210 |
Long-term investments: |  |  |  |  |  |  |
Asset-backed securities | 2,855 |  |  | 1 |  |  | — |  |  | 2,856 |
Corporate bonds | 37,490 |  |  | 32 |  |  | (20 | ) |  | 37,502 |
Total | 40,345 |  |  | 33 |  |  | (20 | ) |  | 40,358 |
Total | $ | 343,204 |  |  | $ | 43 |  |  | $ | (162 | ) |  | $ | 343,085 |
| December 31, 2016
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
| (in thousands)
Cash and cash equivalents: |  |  |  |  |  |  |
Cash | $ | 72,673 |  |  | $ | — |  |  | $ | — |  |  | $ | 72,673 |
Money market funds | 473 |  |  | — |  |  | — |  |  | 473 |
Commercial paper | 13,591 |  |  | — |  |  | — |  |  | 13,591 |
Total | 86,737 |  |  | — |  |  | — |  |  | 86,737 |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 14,782 |  |  | 5 |  |  | — |  |  | 14,787 |
Corporate bonds | 13,490 |  |  | — |  |  | (11 | ) |  | 13,479 |
Asset-backed securities | 1,235 |  |  |  |  |  |  | 1,235 |
U.S. government agencies | 127,660 |  |  |  |  | (42 | ) |  | 127,618 |
Total | 157,167 |  |  | 5 |  |  | (53 | ) |  | 157,119 |
Long-term investments: |  |  |  |  |  |  |
Asset-backed securities | 5,091 |  |  | 2 |  |  | — |  |  | 5,093 |
U.S. government agencies | 29,501 |  |  | — |  |  | (71 | ) |  | 29,430 |
Corporate bonds | 11,243 |  |  | — |  |  | (41 | ) |  | 11,202 |
Total | 45,835 |  |  | 2 |  |  | (112 | ) |  | 45,725 |
Total | $ | 289,739 |  |  | $ | 7 |  |  | $ | (165 | ) |  | $ | 289,581 |
Schedule of changes to accumulated other comprehensive income | The following table shows the changes to accumulated other comprehensive income (loss) for the nine months ended September 30, 2017 (in thousands):
| Unrealized Gain (Loss), net on Investments
Balance at December 31, 2016 | $ | (156 | )
Change in net realized gain (loss) on investments | 32 |
Amounts reclassified for net realized gain (loss) included in net income | 4 |
Other comprehensive income (loss), net | 36 |
Balance at September 30, 2017 | $ | (120 | )
Schedule of Assets Measured on Recurring Basis | The following table sets forth by level within the fair value hierarchy the fair value of the Company's available-for-sale securities measured on a recurring basis, excluding cash and money market funds:
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
| (in thousands)
Commercial paper | $ | — |  |  | $ | 20,933 |  |  | $ | — |  |  | $ | 20,933 |
U.S. government agencies | — |  |  | 159,019 |  |  | — |  |  | 159,019 |
Corporate bonds | — |  |  | 69,269 |  |  | — |  |  | 69,269 |
Asset-backed securities | — |  |  | 3,347 |  |  | — |  |  | 3,347 |
Total | $ | — |  |  | $ | 252,568 |  |  | $ | — |  |  | $ | 252,568 |
| December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Fair Value
| (in thousands)
Commercial paper | $ | — |  |  | $ | 28,378 |  |  | $ | — |  |  | $ | 28,378 |
U.S. government agencies | — |  |  | 157,048 |  |  | — |  |  | 157,048 |
Corporate bonds | — |  |  | 24,681 |  |  | — |  |  | 24,681 |
Asset-backed securities | — |  |  | 6,328 |  |  | — |  |  | 6,328 |
Total | $ | — |  |  | $ | 216,435 |  |  | $ | — |  |  | $ | 216,435 |
Schedule of Available-for-Sale Securities by Contractual Maturity | The following summarizes the fair value of securities classified as available-for-sale by contractual, or effective, maturity:
| September 30, 2017
| Mature within One Year |  | After One Year through Two Years |  | Over Two Years |  | Fair Value
| (in thousands)
Commercial paper | $ | 20,933 |  |  | $ | — |  |  | $ | — |  |  | $ | 20,933 |
U.S. government agencies | 159,019 |  |  | — |  |  | — |  |  | 159,019 |
Corporate bonds | 32,783 |  |  | 27,037 |  |  | 9,449 |  |  | 69,269 |
Asset-backed securities | 1,781 |  |  | 1,000 |  |  | 566 |  |  | 3,347 |
Total | $ | 214,516 |  |  | $ | 28,037 |  |  | $ | 10,015 |  |  | $ | 252,568 |
Summary of Gains (Losses) Recognized From Forward Contracts and Other Foreign Currency Transactions | The following summarizes the gains (losses) recognized in Other expense, net on the condensed consolidated statement of operations, from forward contracts and other foreign currency transactions:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Net loss from forward contracts | $ | (463 | ) |  | $ | (82 | ) |  | $ | (1,585 | ) |  | $ | (9 | )
Other foreign currency transactions gain | 431 |  |  | (2 | ) |  | 1,424 |  |  | (276 | )
Total foreign exchange gain (loss), net | $ | (32 | ) |  | $ | (84 | ) |  | $ | (161 | ) |  | $ | (285 | )

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959 + Details
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