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Quarterly Financial Data (Selected Quarterly Financial Data) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Revenue | $ 128,000 | $ 143,000 | $ 102,000 | $ 102,000 | $ 101,000 | $ 103,000 | $ 101,000 | $ 104,000 |  |  | $ 475,000 | $ 409,000
Total operating expenses | 3,068,000 | 2,571,000 | 2,694,000 | 2,369,000 | 2,698,000 | 5,334,000 | 3,849,000 | 2,638,000 |  |  | 10,702,000 | 14,519,000
Loss from operations | (2,940,000) | (2,428,000) | (2,592,000) | (2,267,000) | (2,597,000) | (5,231,000) | (3,748,000) | (2,534,000) |  |  | (10,227,000) | (14,110,000)
Other income (expense), net | 636,000 | 7,867,000 | 13,361,000 | (12,226,000) |  |  |  |  |  |  | 9,638,000 | 37,219,000
Other income |  |  |  |  | 1,933,000 | 26,438,000 | 17,621,000 |  |  |  |  |
Other expense |  |  |  |  |  |  |  | (8,773,000) |  |  | (302,000) |
Income tax benefit | 73,000 |  |  |  |  |  |  |  |  |  | 73,000 |
Net (loss) income | (2,231,000) | 5,439,000 | 10,769,000 | (14,493,000) | (664,000) | 21,207,000 | 13,873,000 | (11,307,000) |  |  | (516,000) | 23,109,000
Accretion of Series B redeemable convertible preferred stock | (949,000) | (7,163,000) | (1,828,000) | (338,000) | (330,000) | (323,000) | (318,000) | (314,000) |  |  | (10,278,000) | (1,285,000)
Net (loss) income attributable to common stockholders | $ (3,180,000) | $ (1,724,000) | $ 7,225,000 | $ (14,831,000) | $ (994,000) | $ 14,493,000 | $ 9,389,000 | $ (11,621,000) | $ 1,732,000 | $ 16,115,000 | $ (10,794,000) | $ 15,757,000
Net (loss) income per share of common stock - basic | $ (0.54) | $ (0.30) | $ 1.27 | $ (3.49) | $ (0.25) | $ 3.87 | $ 2.56 | $ (3.18) | $ 0.47 | $ 4.37 | $ (1.99) | $ 4.21
Net (loss) income per share of common stock - diluted | $ (0.54) | $ (0.30) | $ (0.33) | $ (3.49) | $ (0.44) | $ (0.86) | $ (0.63) | $ (3.18) | $ (1.06) | $ (1.96) | $ (1.99) | $ (2.33)
Scenario, Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income attributable to common stockholders |  |  | $ 8,941,000 |  |  | $ 20,884,000 | $ 13,555,000 |  | $ 1,934,000 | $ 22,818,000 |  | $ 21,824,000
Net (loss) income per share of common stock - basic |  |  | $ 1.58 |  |  | $ 5.58 | $ 3.69 |  | $ 0.53 | $ 6.19 |  | $ 5.82
Net (loss) income per share of common stock - diluted |  |  | $ 1.17 |  |  | $ 3.30 | $ 2.09 |  | $ 0.30 | $ 3.53 |  | $ 3.37

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