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Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - 9 months ended Sep. 30, 2015 - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member] | Convertible Notes [Member] | Convertible Notes [Member] Common Stock [Member] | Convertible Notes [Member] Additional Paid-In Capital [Member] | 2015 Bridge Notes [Member] | 2015 Bridge Notes [Member] Common Stock [Member] | 2015 Bridge Notes [Member] Additional Paid-In Capital [Member] | Series B Redeemable Convertible Preferred Stock [Member] | Seed Redeemable Convertible Preferred Stock [Member] | Series A-4 Redeemable Convertible Preferred Stock [Member] | Series B-1 Redeemable Convertible Preferred Stock [Member] | Junior Seed Convertible Preferred Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ (78,794) |  | $ 23,142 | $ (101,936) |  |  |  |  |  |  | $ 20,894 | $ 1,331 | $ 4,000 | $ 9,344 | $ 4
Beginning balance, shares at Dec. 31, 2014 |  | 188,625 |  |  |  |  |  |  |  |  | 41,788,790 | 1,219,508 | 1,307,190 | 18,687,554 | 410,000
Conversion of preferred stock and notes into common stock | 35,573 |  | 35,573 |  | $ 43,060 | $ 1 | $ 43,059 | $ 8,407 |  | $ 8,407 | $ (20,894) | $ (1,331) | $ (4,000) | $ (9,344) | $ (4)
Conversion of preferred stock and notes into common stock, shares |  | 4,155,539 |  |  |  | 5,104,655 |  |  | 664,559 |  | (41,788,790) | (1,219,508) | (1,307,190) | (18,687,554) | (410,000)
Issuance of common stock and warrants, shares |  | 1,454,553 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of warrant with term loan | 198 |  | 198 |  |  |  |  |  |  |  |  |  |  |  |
Exercise of common stock options | $ 151 |  | 151 |  |  |  |  |  |  |  |  |  |  |  |
Exercise of common stock options, shares | 71,323 | 71,325 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for consulting services in connection with the Merger | $ 4,248 |  | 4,248 |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for consulting services in connection with the Merger, shares |  | 335,844 |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of common stock in connection with the Merger | $ 30,422 |  | $ 30,422 |  |  |  |  |  |  |  |  |  |  |  |
Exchange of common stock in connection with the Merger, shares |  | 2,540,910 |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock units | 2,384 | 180,090 | 2,384 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | $ 1,888 |  | $ 1,888 |  |  |  |  |  |  |  |  |  |  |  |
Net loss | (21,631) |  |  | (21,631) |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2015 | 35,906 | $ 1 | 159,472 | $ (123,567) |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares at Sep. 30, 2015 |  | 14,696,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock and warrants | $ 10,000 |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |

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