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Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information [Line Items] | ||||||||||||||
| Total revenue | $ 911 | $ 911 | $ 2,198 | $ 2,198 | $ 5,174 | $ 3,259 | $ 1,228 | $ 1,360 | $ 1,270 | $ 1,823 | $ 7,372 | $ 10,481 | $ 7,117 | $ 4,068 |
| Net income (loss) | $ (842) | $ (209) | $ (1,145) | $ 5,064 | $ 6,001 | $ (280) | $ (8,013) | $ (1,724) | $ (5,163) | $ (2,646) | $ 11,065 | $ 9,711 | $ (15,180) | $ (15,203) |
| Basic net income (loss) per share | $ (0.01) | $ 0.00 | $ (0.01) | $ 0.06 | $ 0.08 | $ 0.00 | $ (0.12) | $ (0.03) | $ (0.09) | $ (0.03) | $ 0.14 | $ 0.12 | $ (0.23) | $ (0.26) |
| Diluted net income (loss) per share | $ (0.01) | $ 0.00 | $ (0.01) | $ 0.00 | $ 0.07 | $ 0.00 | $ (0.12) | $ (0.06) | $ (0.09) | $ (0.03) | $ 0.10 | $ 0.10 | $ (0.23) | $ (0.28) |