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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2014
Fair Value Measurements [Abstract] |
Schedule of fair value of the warrants | The fair value of the warrants at June 30, 2014 was determined by using an option pricing model with the following assumptions:
|  | 2013 Warrants |  |  | 2012 Warrants |
Expected volatility |  |  | 94.18% |  |  |  | 111.35% |
Risk-free interest rates |  |  | 1.34% |  |  |  | 0.11% |
Expected life (in years) |  |  | 4.33 |  |  |  | 0.92 |
Assets and liabilities measured at fair value on a recurring basis | The table below presents the Company’s assets and liabilities measured at fair value on a recurring basis as of June 30, 2014, aggregated by the level in the fair value hierarchy within which those measurements fall.
| Assets and Liabilities Measured at Fair Value on a Recurring Basis |
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Balance at June 30, 2014 |
Assets |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,945 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,945 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant liability |  | $ | — |  |  | $ | — |  |  | $ | 1,075 |  |  | $ | 1,075 |
Fair value measurements using significant unobservable inputs | The table below presents the activity within Level 3 of the fair value hierarchy for the six months ended June 30, 2014:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |
(in thousands) |  | Warrant Liability |
Beginning balance as of December 31, 2013 |  | $ | 2,310 |
Total change in the fair value of the liability included in earnings, including warrant expirations |  |  | (1,092 | )
Fair value of warrants exercised |  |  | (143 | )
Ending balance as of June 30, 2014 |  | $ | 1,075 |

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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 the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + 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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