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Fair Value of Financial Instruments (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Fair Value of Financial Instruments |  |
Schedule of estimated fair values of financial instruments outstanding | The estimated fair values of financial instruments outstanding were (in thousands):
|  | September 30, 2017 |
|  |  |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
Cash and cash equivalents |  | $ | 2,784 |  | $ | — |  | $ | — |  | $ | 2,784 |
|  | December 31, 2016 |
|  |  |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
Cash and cash equivalents |  | $ | 8,766 |  | $ | — |  | $ | — |  | $ | 8,766 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government-sponsored enterprise bonds |  | $ | 762 |  | $ | — |  | $ | — |  | $ | 762 |
Corporate notes |  |  | 240 |  |  | — |  |  | — |  |  | 240 |
Total short-term investments |  | $ | 1,002 |  | $ | — |  | $ | — |  | $ | 1,002 |
| The estimated fair values of financial instruments outstanding were (in thousands):
|  | December 31, 2016 |
|  |  |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
Cash and cash equivalents |  | $ | 8,766 |  | $ | — |  | $ | — |  | $ | 8,766 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government-sponsored enterprise bonds |  | $ | 762 |  | $ | — |  | $ | — |  | $ | 762 |
Corporate notes |  |  | 240 |  |  | — |  |  | — |  |  | 240 |
Total short-term investments |  | $ | 1,002 |  | $ | — |  | $ | — |  | $ | 1,002 |
|  | December 31, 2015 |
|  |  |  | Unrealized |  | Unrealized |  | Fair |
|  | Cost |  | Gains |  | Losses |  | Value |
Cash and cash equivalents |  | $ | 5,640 |  | $ | — |  | $ | — |  | $ | 5,640 |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government-sponsored enterprise bonds |  | $ | 6,243 |  | $ | — |  | $ | — |  | $ | 6,243 |
Municipal bonds |  |  | 200 |  |  | — |  |  | — |  |  | 200 |
Corporate notes |  |  | 8,171 |  |  | — |  |  | (16) |  |  | 8,155 |
Total short-term investments |  | $ | 14,614 |  | $ | — |  | $ | (16) |  | $ | 14,598 |
Schedule of fair value hierarchy for financial assets (cash equivalents and investments) | The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) as of September 30, 2017 and December 31, 2016 (in thousands):
|  | September 30, 2017 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 620 |  | $ | 620 |  | $ | — |  | $ | — |
|  | December 31, 2016 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 84 |  | $ | 84 |  | $ | — |  | $ | — |
U.S. government-sponsored enterprise bonds |  |  | 3,767 |  |  | — |  |  | 3,767 |  |  | — |
Municipal bonds |  |  | 4,027 |  |  | — |  |  | 4,027 |  |  | — |
Corporate notes |  |  | 480 |  |  | — |  |  | 480 |  |  | — |
Total assets |  | $ | 8,358 |  | $ | 84 |  | $ | 8,274 |  | $ | — |
| The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) as of December 31, 2016 and 2015 (in thousands):
|  | December 31, 2016 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 84 |  | $ | 84 |  | $ | — |  | $ | — |
U.S. government-sponsored enterprise bonds |  |  | 3,767 |  |  | — |  |  | 3,767 |  |  | — |
Municipal bonds |  |  | 4,027 |  |  | — |  |  | 4,027 |  |  | — |
Corporate notes |  |  | 480 |  |  | — |  |  | 480 |  |  | — |
Total assets |  | $ | 8,358 |  | $ | 84 |  | $ | 8,274 |  | $ | — |
|  | December 31, 2015 |
|  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3 |
Money market funds |  | $ | 2,238 |  | $ | 2,238 |  | $ | — |  | $ | — |
U.S. government-sponsored enterprise bonds |  |  | 7,525 |  |  | — |  |  | 7,525 |  |  | — |
Municipal bonds |  |  | 200 |  |  | — |  |  | 200 |  |  | — |
Corporate notes |  |  | 8,255 |  |  | — |  |  | 8,255 |  |  | — |
Certificates of deposit |  |  | 240 |  |  | — |  |  | 240 |  |  | — |
Total assets |  | $ | 18,458 |  | $ | 2,238 |  | $ | 16,220 |  | $ | — |

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- Definition Tabular disclosure of assets measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + 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 (a) -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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: 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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- Definition Tabular disclosure of the summary of investment holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 + Details
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