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Quarterly Financial Data (Selected Quarterly Financial Data) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |
Revenue | $ 22,000 | $ 29,000 | $ 103,000 | $ 106,000 | $ 128,000 | $ 143,000 | $ 102,000 | $ 102,000 | $ 260,000 | $ 475,000
Total operating expenses | 11,886,000 | 3,436,000 | 3,692,000 | 4,624,000 | 3,068,000 | 2,571,000 | 2,694,000 | 2,369,000 | 23,638,000 | 10,702,000
Loss from operations | (11,864,000) | (3,407,000) | (3,589,000) | (4,518,000) | (2,940,000) | (2,428,000) | (2,592,000) | (2,267,000) | (23,378,000) | (10,227,000)
Other income (expense), net | 1,808,000 | 1,032,000 | (262,000) | 1,406,000 | 636,000 | 7,867,000 | 13,361,000 | (12,226,000) | 3,984,000 | 9,638,000
Income tax benefit |  |  |  |  | 73,000 |  |  |  | 556,000 | 73,000
Net (loss) income | (9,500,000) | (2,375,000) | (3,851,000) | (3,112,000) | (2,231,000) | 5,439,000 | 10,769,000 | (14,493,000) | (18,838,000) | (516,000)
Accretion of Series B redeemable convertible preferred stock |  |  | (133,000) | (1,725,000) | (949,000) | (7,163,000) | (1,828,000) | (338,000) | (1,858,000) | (10,278,000)
Excess of fair value of consideration transferred on conversion of Series B Preferred Stock |  | (1,214,000) | (2,366,000) |  |  |  |  |  | (3,580,000) |
Net loss attributable to common stockholders | $ (9,500,000) | $ (3,589,000) | $ (6,350,000) | $ (4,837,000) | $ (3,180,000) | $ (1,724,000) | $ 8,941,000 | $ (14,831,000) | $ (24,276,000) | $ (10,794,000)
Net loss per share of common stock - basic | $ (0.70) | $ (0.32) | $ (0.73) | $ (0.82) | $ (0.54) | $ (0.30) | $ 1.27 | $ (3.49) |  |
Net loss per share of common stock - diluted | $ (0.76) | $ (0.32) | $ (0.78) | $ (0.82) | $ (0.54) | $ (0.30) | $ (0.33) | $ (3.49) |  |

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