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Stockholders' Equity - Warrant Valuation Assumptions (Details) - $ / shares |  | 12 Months Ended
--- | --- | ---
Apr. 03, 2014 | Dec. 31, 2013
IPO |  |
Class of Stock [Line Items] |  |
IPO price per share | $ 7.00 |
Warrants |  |
Class of Stock [Line Items] |  |
Expected dividends | 0.00% | 0.00%
Volatility |  | 45.00%
Warrants | Minimum [Member] |  |
Class of Stock [Line Items] |  |
Risk-free interest rate | 0.13% | 0.33%
Volatility | 40.00% |
Warrants | Maximum [Member] |  |
Class of Stock [Line Items] |  |
Risk-free interest rate | 2.73% | 2.60%
Volatility | 50.00% |
Warrants | Series A-2 Convertible Preferred Stock |  |
Class of Stock [Line Items] |  |
Fair value of stock | $ 1.75 | $ 2.69
Warrants | Series D-2 Convertible Preferred Stock |  |
Class of Stock [Line Items] |  |
Fair value of stock | 1.75 | $ 2.81
Warrants | Common Stock |  |
Class of Stock [Line Items] |  |
Fair value of stock | $ 7 |

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