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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Summary of Changes in Fair Value of Level 3 Financial Liabilities | The following table presents the changes in fair value of our total Level 3 financial liabilities for the year ended December 31, 2017. During the twelve months ended December 31, 2017, no common stock warrants were issued that were classified as liabilities (in thousands):
|  | Liability at |  |  | Liability Assumed |  |  | Unrealized |  |  | Liability at |
|  | December 31, |  |  | as part of |  |  | Gain on |  |  | December 31, |
|  | 2016 |  |  | Arrangement |  |  | warrants |  |  | 2017 |
Warrant liability |  | $ | — |  |  | $ | 150 |  |  | $ | (150 | ) |  | $ | — |
Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis, and indicates the fair value hierarchy of the valuation techniques we utilized to determine such fair value (in thousands):
December 31, 2017 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,262 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,262 |
Money market securities (cash equivalents) |  |  | 4,022 |  |  |  | — |  |  |  | — |  |  |  | 4,022 |
Restricted cash (Note 12) |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
Total assets |  | $ | 5,556 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,556 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
December 31, 2016 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Total assets |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Summary of Cash and Cash Equivalents and Short Term Investments | Cash and cash equivalents and short term investments (in thousands):
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
December 31, 2017 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Cash |  | $ | 1,262 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,262 |
Money market securities |  |  | 4,022 |  |  |  | — |  |  |  | — |  |  |  | 4,022 |
Total cash and cash equivalents |  | $ | 5,284 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,284 |
Money market securities (restricted cash) |  |  | 272 |  |  |  | — |  |  |  | — |  |  |  | 272 |
Total restricted cash |  | $ | 272 |  |  | $ | — |  |  | $ | — |  |  | $ | 272 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
December 31, 2016 |  | Cost |  |  | Gains |  |  | Losses |  |  | Fair Value |
Cash |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Total cash and cash equivalents |  | $ | 15 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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