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Subsequent Events - Additional information (Details)
 3 Months Ended
Mar. 31, 2014
Subsequent Event [Line Items]  
Description Of Stock Options Expected Vest Such options shall vest: (i) as to 200,000 Common Shares, on the date of grant; and (ii) as to 200,000 Common Shares, upon and subject to orphan drug approval of STS in the EU, provided that they then remain on the Board at the time of such approval and that they have played a vital or precipitating part in obtaining such EU orphan drug designation, as reasonably determined by non-interested Board members. If the vesting conditions referred to in (ii) above have not occurred by May 31, 2016, the option to acquire the 200,000 common shares referred to in (ii) above shall be terminated and of no further force or effect.