Debt Financing (Details) - Convertible promissory notes - USD ($)
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|
1 Months Ended |
12 Months Ended |
May. 08, 2012 |
May. 31, 2013 |
Dec. 31, 2013 |
| Debt financing |
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|
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| Cash proceeds received |
$ 23,100,000
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|
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| Interest rate |
10.00%
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| Gross proceeds (at least) |
$ 25,000,000.0
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| Conversion price upon automatic conversion (as a percent) (to the lower of) |
85.00%
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| Conversion price upon automatic conversion (in dollars per share) |
$ 12.08
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| Conversion price per share (as a percent) (to the greater of) |
85.00%
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| Conversion price convertible at the option of the holder if change in control or initial public offering occurs prior to maturity date (in dollars per share) |
$ 7.95
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| Conversion price convertible at the option of the holder if change in control or initial public offering does not occur prior to the maturity date (in dollars per share) |
7.16
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| Conversion price (in dollars per share) |
$ 7.16
|
$ 7.16
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| Beneficial conversion feature |
$ 2,700,000
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| Interest expense |
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|
$ 800,000
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| Amortization of debt discount |
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|
$ 900,000
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| Common stock issued on conversion (in shares) |
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3,556,412
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