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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2013
Fair Value of Warrants | The fair value of the warrants at June 30, 2013, and December 31, 2012, consisted of the following (in thousands):
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
2009 Warrants |  | $ | 3,992 |  |  | $ | 2,009 |
2010 Warrants |  |  | 6,298 |  |  |  | 3,894 |
Total warrant liability |  | $ | 10,290 |  |  | $ | 5,903 |
Fair Value Assumptions of Warrants | The fair value of the Company’s warrants was based on using the binomial-lattice option valuation model and using the following assumptions at June 30, 2013, and December 31, 2012:
|  | June 30, |  |  | December 31, |
|  | 2013 |  |  | 2012 |
2009 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 1.15 |  |  |  | 1.65 |
Estimated volatility |  |  | 41 | % |  |  | 45 | %
Risk-free interest rate |  |  | 0.15 | % |  |  | 0.25 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
2010 Warrants: |  |  |  |  |  |  |  |
Expected term (in years) |  |  | 2.36 |  |  |  | 2.86 |
Estimated volatility |  |  | 42 | % |  |  | 51 | %
Risk-free interest rate |  |  | 0.36 | % |  |  | 0.36 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + 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=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 + Details
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