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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value Disclosures [Abstract] |
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):
September 30, 2014 |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 17,934 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,934 |
Money market securities |  |  | 31,016 |  |  |  | — |  |  |  | — |  |  |  | 31,016 |
Restricted cash |  |  | 251 |  |  |  | — |  |  |  | — |  |  |  | 251 |
Corporate bonds and commercial paper |  |  | — |  |  |  | 5,057 |  |  |  | — |  |  |  | 5,057 |
Total assets |  | $ | 49,201 |  |  | $ | 5,057 |  |  | $ | — |  |  | $ | 54,258 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  | $ | — |  |  | $ | — |  |  | $ | 3,975 |  |  | $ | 3,975 |
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 nine months ended September 30, 2014. During the nine months ended September 30, 2014 we issued 3.5 million common stock warrants that were classified as liabilities (in thousands):
|  | Liability at December 31, 2013 |  |  | Issuance of Warrants |  |  | Unrealized Gain on warrants |  |  | Liability at September 30, 2014 |
Warrant liability |  | $ | 214 |  |  | $ | 6,529 |  |  | $ | (2,768 | ) |  | $ | 3,975 |
Summary of Marketable Securities | Marketable securities consist of the following (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 17,934 |  |  | $ | — |  |  | $ | — |  |  | $ | 17,934 |
Money market securities |  |  | 31,016 |  |  |  | — |  |  |  | — |  |  |  | 31,016 |
Total cash and cash equivalents |  | $ | 48,950 |  |  | $ | — |  |  | $ | — |  |  | $ | 48,950 |
Money market securities |  |  | 251 |  |  |  | — |  |  |  | — |  |  |  | 251 |
Total restricted cash |  | $ | 251 |  |  | $ | — |  |  | $ | — |  |  | $ | 251 |
Corporate bonds and commercial paper |  |  | 5,061 |  |  |  | — |  |  |  | (4 | ) |  |  | 5,057 |
Total short-term investments |  | $ | 5,061 |  |  | $ | — |  |  | $ | (4 | ) |  | $ | 5,057 |

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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 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&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 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + 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=36462937&loc=d3e19190-110258 + Details
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