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Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Net loss per common share |  |  |  |  |
Net loss |  | $ (17,730) | $ (14,448) | $ (14,448) | $ (16,197)
Extinguishment of preferred stock |  | 31,806 |  |  |
Accretion and dividends of preferred stock |  |  |  | (3,300) | (2,925)
Loss attributable to common stockholders - basic and diluted |  | $ (10,496) | $ (16,917) | $ (21,217) | $ (6,883)
Weighted-average number of common shares used in net loss per share-basic and diluted (in shares) |  | 11,179,756 | 926,597 | 926,597 | 1,697,044
Net loss per share - basic and diluted (in dollars per share) |  | $ (0.94) | $ (18.26) | $ (18.26) | $ (4.06)
Series A, Series B and Series C convertible redeemable preferred stock |  |  |  |  |
Net loss per common share |  |  |  |  |
Extinguishment of preferred stock | $ 31,806 |  |  |  |
Accretion and dividends of preferred stock |  | $ (23,327) | $ (2,469) |  |
Series D convertible redeemable preferred stock |  |  |  |  |
Net loss per common share |  |  |  |  |
Accretion and dividends of preferred stock |  | $ (1,245) |  |  |

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