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Basic and Diluted Net Loss Per Common Share
9 Months Ended
Sep. 30, 2017
Basic and Diluted Net Loss Per Common Share [Abstract]  
Basic and Diluted Net Loss Per Common Share
6.    Basic and Diluted Net Loss Per Common Share
Basic and diluted net loss per common share is computed based on the weighted-average number of common shares outstanding. Common share equivalents (which consist of options and warrants) are excluded from the computation of diluted net loss per common share where the effect would be anti-dilutive.  Common share equivalents that could potentially dilute net loss per share in the future, and which were excluded from the computation of diluted loss per share, totaled 6.5 million shares for each of the three-month and nine-month periods ended September 30, 2017, and 7.3 million shares for each of the three-month and nine-month periods ended September 30, 2016.