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Redeemable Convertible Preferred Stock (Tables) | 12 Months Ended
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Dec. 31, 2013
Preferred Stock and Warrants Calculated Using the Black Scholes Merton Pricing Model | The preferred stock and warrants were issued for a total of $5.0 million. This amount was allocated to the preferred stock and warrants based on their relative fair values. The fair value of the warrants was calculated using the Black Scholes-Merton pricing model using the following weighted average assumptions:
Number of warrants |  | 325,000 |
Exercise price | $ | 6.62 |
Expected volatility of underlying stock |  | 74 | %
Risk-free interest rate |  | 1.62 | %
Dividend yield |  | 0 | %
Expected life of warrants |  | 8 years |
Weighted-average fair value of warrants | $ | 3.11 |
Expiration date |  | May 2, 2020 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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