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Warrants - Summary of Outstanding Warrants (Details) (USD $)
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6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 02, 2014
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Dec. 31, 2013
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Jun. 30, 2014
Common Stock
2017-2019
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Dec. 31, 2013
Common Stock
2017-2019
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Jun. 30, 2014
Common Stock
2017-2019
Minimum
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Dec. 31, 2013
Common Stock
2017-2019
Minimum
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Jun. 30, 2014
Common Stock
2017-2019
Maximum
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Dec. 31, 2013
Common Stock
2017-2019
Maximum
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Dec. 31, 2013
Series C Preferred Stock
2015
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Dec. 31, 2013
Series D Preferred Stock
2013-2014
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Dec. 31, 2013
Series D Preferred Stock
2013-2014
Minimum
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Dec. 31, 2013
Series D Preferred Stock
2013-2014
Maximum
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Dec. 31, 2013
Series E Preferred Stock
2015
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Dec. 31, 2013
Series E Preferred Stock
2016
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| Class Of Warrant Or Right [Line Items] | ||||||||||||||
| Number of warrants | 263,463 | 161,295 | 233,611 | 14,215 | 11,415 | 3,120 | 1,102 | |||||||
| Number of shares exercise price | $ 16.62 | $ 0.30 | $ 0.300 | $ 17.580 | $ 21.900 | $ 9.612 | $ 9.612 | |||||||
| Expiration date | 2017 | 2017 | 2019 | 2019 | 2015 | 2013 | 2014 | 2015 | 2016 | |||||