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Marketable Securities and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Available-for-sale Securities | Marketable securities, classified as available-for-sale, consisted of the following (in thousands):
|  | September 30, 2017 |  | December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Certificates of deposit |  | $ | 15,990 |  |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 15,993 |  |  | $ | 12,499 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 12,508 |
Corporate securities |  | 40,941 |  |  | 12 |  |  | (13 | ) |  | 40,940 |  |  | 42,765 |  |  | 9 |  |  | (42 | ) |  | 42,732 |
U.S. Treasury and agency securities |  | 3,494 |  |  | — |  |  | (12 | ) |  | 3,482 |  |  | 5,190 |  |  | — |  |  | (14 | ) |  | 5,176 |
Commercial paper |  | 9,214 |  |  | 2 |  |  | — |  |  | 9,216 |  |  | 11,470 |  |  | 1 |  |  | (2 | ) |  | 11,469 |
Asset-backed securities |  | 14,352 |  |  | — |  |  | (10 | ) |  | 14,342 |  |  | 13,493 |  |  | — |  |  | (6 | ) |  | 13,487 |
|  | $ | 83,991 |  |  | $ | 18 |  |  | $ | (36 | ) |  | $ | 83,973 |  |  | $ | 85,417 |  |  | $ | 19 |  |  | $ | (64 | ) |  | $ | 85,372 |
Schedule of Cost and Estimated Fair Values of Available-for-sale Securities by Contractual Maturity | The following table summarizes the cost and estimated fair value of marketable securities based on stated effective maturities as of September 30, 2017 (in thousands):
| Amortized Cost |  | Fair Value
Less than 1 year | $ | 59,490 |  |  | $ | 59,480 |
Mature in 1 - 3 years | 24,501 |  |  | 24,493 |
| $ | 83,991 |  |  | $ | 83,973 |
Schedule of gross unrealized losses | Marketable securities in an unrealized loss position consisted of the following (in thousands):
| Less Than 12 Months |  | 12 Months or More |  | Total
As of September 30, 2017 | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Certificates of deposit | $ | 5,500 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 5,500 |  |  | $ | (1 | )
Corporate securities | 27,254 |  |  | (10 | ) |  | 1,500 |  |  | (3 | ) |  | 28,754 |  |  | (13 | )
U.S. Treasury and agency securities | 3,482 |  |  | (12 | ) |  | — |  |  | — |  |  | 3,482 |  |  | (12 | )
Asset-backed securities | 14,342 |  |  | (10 | ) |  | — |  |  | — |  |  | 14,342 |  |  | (10 | )
| $ | 50,578 |  |  | $ | (33 | ) |  | $ | 1,500 |  |  | $ | (3 | ) |  | $ | 52,078 |  |  | $ | (36 | )
| Less Than 12 Months |  | 12 Months or More |  | Total
As of December 31, 2016 | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
Corporate securities | $ | 28,537 |  |  | $ | (42 | ) |  | $ | — |  |  | $ | — |  |  | $ | 28,537 |  |  | $ | (42 | )
U.S. Treasury and agency securities | 5,176 |  |  | (14 | ) |  | — |  |  | — |  |  | 5,176 |  |  | (14 | )
Commercial paper | 8,974 |  |  | (2 | ) |  | — |  |  | — |  |  | 8,974 |  |  | (2 | )
Asset-backed securities | 10,664 |  |  | (6 | ) |  | — |  |  | — |  |  | 10,664 |  |  | (6 | )
| $ | 53,351 |  |  | $ | (64 | ) |  | $ | — |  |  | $ | — |  |  | $ | 53,351 |  |  | $ | (64 | )
Schedule of Cash, Cash Equivalents and Available-for-sale Investments Measured at Fair Value on Recurring Basis | The following is a summary of our cash, cash equivalents and marketable securities measured at fair value on a recurring basis (in thousands):
|  | September 30, 2017 |  | December 31, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash |  | $ | 27,346 |  |  | $ | — |  |  | $ | — |  |  | $ | 27,346 |  |  | $ | 18,672 |  |  | $ | — |  |  | $ | — |  |  | $ | 18,672 |
Cash equivalents |  | 12,573 |  |  | — |  |  | — |  |  | 12,573 |  |  | 10,303 |  |  | — |  |  | — |  |  | 10,303 |
Certificates of deposit |  | — |  |  | 15,993 |  |  | — |  |  | 15,993 |  |  | — |  |  | 12,508 |  |  | — |  |  | 12,508 |
Corporate securities |  | — |  |  | 40,940 |  |  | — |  |  | 40,940 |  |  | — |  |  | 42,732 |  |  | — |  |  | 42,732 |
U.S. Treasury and agency securities |  | — |  |  | 3,482 |  |  | — |  |  | 3,482 |  |  | — |  |  | 5,176 |  |  | — |  |  | 5,176 |
Commercial paper |  | — |  |  | 9,216 |  |  | — |  |  | 9,216 |  |  | — |  |  | 11,469 |  |  | — |  |  | 11,469 |
Asset-backed securities |  | — |  |  | 14,342 |  |  | — |  |  | 14,342 |  |  | — |  |  | 13,487 |  |  | — |  |  | 13,487 |
|  | $ | 39,919 |  |  | $ | 83,973 |  |  | $ | — |  |  | $ | 123,892 |  |  | $ | 28,975 |  |  | $ | 85,372 |  |  | $ | — |  |  | $ | 114,347 |

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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 For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: 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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