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Investment Securities and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Schedule of Available-for-sale Securities | Investment securities classified as available-for-sale consisted of the following at September 30, 2017 and December 31, 2016 (in thousands):
| September 30, 2017
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 34,558 |  |  | $ | 11 |  |  | $ | (19 | ) |  | $ | 34,550 |
Agency securities | 11,302 |  |  | — |  |  | (17 | ) |  | 11,285 |
Certificates of deposit | 2,982 |  |  | 3 |  |  | (1 | ) |  | 2,984 |
Total available-for-sale investment securities | $ | 48,842 |  |  | $ | 14 |  |  | $ | (37 | ) |  | $ | 48,819 |
| December 31, 2016
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Corporate bonds | $ | 30,492 |  |  | $ | 9 |  |  | $ | (56 | ) |  | $ | 30,445 |
Agency securities | 6,248 |  |  | — |  |  | (20 | ) |  | 6,228 |
Certificates of deposit | 5,472 |  |  | 16 |  |  | — |  |  | 5,488 |
Total available-for-sale investment securities | $ | 42,212 |  |  | $ | 25 |  |  | $ | (76 | ) |  | $ | 42,161 |
Available-for-sale Investments, by Remaining Contract Maturity | At September 30, 2017 and December 31, 2016, the contractual maturities of our investments did not exceed 36 months. The fair values of available-for-sale investments, by remaining contractual maturity, are as follows (in thousands):
| September 30, 2017 |  | December 31, 2016
| Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in 1 year or less | $ | 28,398 |  |  | $ | 28,396 |  |  | $ | 15,475 |  |  | $ | 15,473 |
Due after 1 year through 3 years | 20,444 |  |  | 20,423 |  |  | 26,737 |  |  | 26,688 |
Total available-for-sale investment securities | $ | 48,842 |  |  | $ | 48,819 |  |  | $ | 42,212 |  |  | $ | 42,161 |
Schedule of Sales, Calls, and Maturities | During the nine months ended September 30, 2017 and 2016, we had sales and maturities (which includes calls) of investment securities, as follows (in thousands):
| Nine Months Ended September 30, 2017
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Agency securities | $ | 1 |  |  | $ | — |  |  | $ | 15 |  |  | $ | 1,044 |
Corporate bonds | — |  |  | — |  |  | — |  |  | 7,440 |
Certificates of deposit | — |  |  | — |  |  | — |  |  | 2,490 |
| $ | 1 |  |  | $ | — |  |  | $ | 15 |  |  | $ | 10,974 |
| Nine Months Ended September 30, 2016
| Gross Realized Gains |  | Gross Realized Losses |  | Gross Proceeds from Sales |  | Gross Proceeds from Maturities
Agency securities | $ | 5 |  |  | $ | — |  |  | $ | 3,005 |  |  | $ | 9,557 |
Corporate bonds | 1 |  |  | — |  |  | 5,011 |  |  | 2,480 |
Treasury bills | — |  |  | — |  |  | 2,000 |  |  | 3,830 |
Certificates of Deposit | — |  |  | — |  |  | — |  |  | 1,245 |
| $ | 6 |  |  | $ | — |  |  | $ | 10,016 |  |  | $ | 17,112 |
Fair Value, Assets Measured on Recurring Basis | The following tables summarize our financial assets measured at fair value on a recurring basis as of September 30, 2017 and December 31, 2016, by level within the fair value hierarchy (in thousands):
| September 30, 2017
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 3,910 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,910 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 34,550 |  |  | — |  |  | 34,550 |
Agency securities | — |  |  | 11,285 |  |  | — |  |  | 11,285 |
Certificates of deposit | 2,984 |  |  | — |  |  | — |  |  | 2,984 |
Total | $ | 6,894 |  |  | $ | 45,835 |  |  | $ | — |  |  | $ | 52,729 |
| December 31, 2016
| Level 1 |  | Level 2 |  | Level 3 |  | Total Fair Value
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 4,849 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,849 |
Available-for-sale investment securities: |  |  |  |  |  |  |
Corporate bonds | — |  |  | 30,445 |  |  | — |  |  | 30,445 |
Agency securities | — |  |  | 6,228 |  |  | — |  |  | 6,228 |
Certificates of deposit | 5,488 |  |  | — |  |  | — |  |  | 5,488 |
Total | $ | 10,337 |  |  | $ | 36,673 |  |  | $ | — |  |  | $ | 47,010 |

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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 proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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