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Warrants (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2014
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Sep. 30, 2012
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Nov. 30, 2012
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Jul. 02, 2013
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Jun. 30, 2014
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| Warrants |
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| (Loss)/gain recognized for change in the fair value of the warrant liability |
$ (2,545,000) |
$ (42,000) |
$ (2,587,000) |
$ 32,000 |
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| Warrant |
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| Warrants |
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| Exercise price (in dollars per share) |
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$ 7.23 |
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| Number of shares of common stock to be purchased against outstanding warrants |
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285,920 |
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| Warrant | Total | Short term convertible notes issued September 2012 |
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| Warrants |
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| Estimated fair value |
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100,000 |
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| Warrant | Total | Short term convertible notes issued November 2012 |
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| Warrants |
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| Estimated fair value |
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200,000 |
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| Series A preferred stock warrant |
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| Warrants |
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| Warrants exercisable into stock (in shares) |
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1,940,000 |
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| Exercise price (in dollars per share) |
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$ 1.00 |
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| Number of shares of common stock to be purchased against outstanding warrants |
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277,690 |
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| Series A preferred stock warrant | Total | Short term convertible notes issued September and November 2012 |
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| Warrants |
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| Estimated fair value |
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300,000 |
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| Common stock |
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| Warrants |
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| Exercise price (in dollars per share) |
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$ 15.19 |
| Common stock | Warrant |
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| Warrants |
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| Warrants exercisable into stock (in shares) |
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277,690 |
8,230 |
| Fair value of warrants |
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$ 100,000 |
| Share price of common stock (in dollars per share) |
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$ 6.99 |
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