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v3.3.1.900

Nature of the Business and Operations (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 13, 2015 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Nature of the Business and Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss (including noncontrolling interests) |  | $ (2,588) | $ (1,368) | $ (1,792) | $ (2,072) | $ (3,107) | $ (3,245) | $ (3,874) | $ (4,008) | $ (3,047) | $ (3,343) | $ (3,120) | $ (3,570) | $ (7,820) | $ (14,234) | $ (13,080)
Accumulated deficit |  | $ (173,749) |  |  |  | $ (165,929) |  |  |  |  |  |  |  | (173,749) | (165,929) |
Net cash used in operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (8,063) | $ (11,824) | $ (8,801)
Issuance of common stock | 3,200,000 | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Price per share | $ 1.90 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued for cash | $ 6,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 5,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct offering cost | $ 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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