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Cash, Cash Equivalents and Investments (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash, Cash Equivalents and Investments |
Cash, cash equivalents and investments | Our cash and cash equivalents consist of cash and instruments with original maturities of less than three months. Our investments consist of instruments with original maturities of more than three months. As of December 31, 2017 and 2016, our cash, cash equivalents and investments are classified as follows (in thousands):
|  | December 31, 2017 |  | December 31, 2016 |
|  |  |  |  | Gross |  | Gross |  |  |  |  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gain |  | (Loss) |  | Value |  | Cost |  | Gain |  | (Loss) |  | Value |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 43,610 |  | $ | — |  | $ | — |  | $ | 43,610 |  | $ | 23,948 |  | $ | — |  | $ | — |  | $ | 23,948 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit 1 |  |  | 742 |  |  | — |  |  | — |  |  | 742 |  |  | 12,204 |  |  | — |  |  | — |  |  | 12,204 |
Total cash and cash equivalents |  |  | 44,352 |  |  | — |  |  | — |  |  | 44,352 |  |  | 36,152 |  |  | — |  |  | — |  |  | 36,152 |
Investments (available-for-sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit 2 |  |  | 7,099 |  |  | — |  |  | (24) |  |  | 7,075 |  |  | 8,999 |  |  | 1 |  |  | (20) |  |  | 8,980 |
Corporate bonds |  |  | 25,602 |  |  | — |  |  | (69) |  |  | 25,533 |  |  | 8,479 |  |  | — |  |  | (47) |  |  | 8,432 |
Corporate equity securities |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 48 |  |  | 111 |  |  | — |  |  | 159 |
Total investments |  |  | 32,701 |  |  | — |  |  | (93) |  |  | 32,608 |  |  | 17,526 |  |  | 112 |  |  | (67) |  |  | 17,571 |
Total cash, cash equivalents and investments |  | $ | 77,053 |  | $ | — |  | $ | (93) |  | $ | 76,960 |  | $ | 53,678 |  | $ | 112 |  | $ | (67) |  | $ | 53,723 |
Contractual maturities on investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year 3 |  | $ | 20,056 |  |  |  |  |  |  |  | $ | 20,032 |  | $ | 11,325 |  |  |  |  |  |  |  | $ | 11,415 |
Due after 1 through 5 years 4 |  |  | 12,645 |  |  |  |  |  |  |  |  | 12,576 |  |  | 6,201 |  |  |  |  |  |  |  |  | 6,156 |
|  | $ | 32,701 |  |  |  |  |  |  |  | $ | 32,608 |  | $ | 17,526 |  |  |  |  |  |  |  | $ | 17,571 |
| 1. |  | Certificate of deposit with original maturities of less than three months.
| 2. |  | Certificate of deposit with original maturities of more than three months.
| 3. |  | Classified as “Short-term investments” in our consolidated balance sheets.
| 4. |  | Classified as “Long-term investments” in our consolidated balance sheets.
Fair value and gross unrealized losses related to available-for-sale securities | A portion of our investments would generate a loss if we sold them on December 31, 2017. The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2017 (in thousands):
|  | In Loss Position |  | In Loss Position |  | Total In |
|  | < 12 months |  | > 12 months |  | Loss Position |
|  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
As of December 31, 2017 |  | Value |  | (Losses) |  | Value |  | (Losses) |  | Value |  | (Losses) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 3,994 |  | $ | (16) |  | $ | 2,342 |  | $ | (8) |  | $ | 6,336 |  | $ | (24) |
Corporate bonds |  |  | 25,533 |  |  | (69) |  |  | — |  |  | — |  |  | 25,533 |  |  | (69) |
Total in loss position |  | $ | 29,527 |  | $ | (85) |  | $ | 2,342 |  | $ | (8) |  | $ | 31,869 |  | $ | (93) |
The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2016 (in thousands):
|  | In Loss Position |  | In Loss Position |  | Total In |
|  | < 12 months |  | > 12 months |  | Loss Position |
|  |  |  |  | Gross |  |  |  |  | Gross |  |  |  |  | Gross |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
As of December 31, 2016 |  | Value |  | (Loss) |  | Value |  | (Loss) |  | Value |  | (Loss) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 5,211 |  | $ | (20) |  | $ | 1,200 |  | $ | — |  | $ | 6,411 |  | $ | (20) |
Corporate bonds |  |  | 5,037 |  |  | (35) |  |  | 3,395 |  |  | (12) |  |  | 8,432 |  |  | (47) |
Total in loss position |  | $ | 10,248 |  | $ | (55) |  | $ | 4,595 |  | $ | (12) |  | $ | 14,843 |  | $ | (67) |
Summary of financial assets and liabilities measured at fair value on a recurring basis |
|  |  |  |  | Quoted Prices in |  |  |  |  | Significant |
|  |  |  |  | Active Markets of |  | Significant Other |  | Unobservable |
|  | Balance as of |  | Identical Assets |  | Observable Inputs |  | Inputs |
|  | December 31, 2017 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 7,817 |  | $ | — |  | $ | 7,817 |  | $ | — |
Corporate bonds |  |  | 25,533 |  |  | — |  |  | 25,533 |  |  | — |
Total |  | $ | 33,350 |  | $ | — |  | $ | 33,350 |  | $ | — |
The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis in accordance with ASC 820 as of December 31, 2016 (in thousands):
|  |  |  |  | Quoted Prices in |  |  |  |  | Significant |
|  |  |  |  | Active Markets of |  | Significant Other |  | Unobservable |
|  | Balance as of |  | Identical Assets |  | Observable Inputs |  | Inputs |
|  | December 31, 2016 |  | (Level 1) |  | (Level 2) |  | (Level 3) |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents and investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 21,184 |  | $ | — |  | $ | 21,184 |  | $ | — |
Corporate bonds |  |  | 8,432 |  |  | — |  |  | 8,432 |  |  | — |
Corporate equity securities |  |  | 159 |  |  | 159 |  |  | — |  |  | — |
Total |  | $ | 29,775 |  | $ | 159 |  | $ | 29,616 |  | $ | — |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and investments. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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