16.  Net Loss Per Common Share

Basic loss per share of common stock is computed using the weighted average number of common shares outstanding for the period. Diluted loss per share is computed without consideration to potentially dilutive instruments because the Company incurred losses in the three months ended December 31, 2017 which would make these instruments anti-dilutive. As of December 31, 2017 and 2016, the number of anti-dilutive stock options and restricted stock units excluded from diluted net loss per common share computations was approximately 1.2 million and 0.7 million, respectively. As of December 31, 2017 and 2016, the number of warrants excluded from diluted net loss per common share computations was approximately 8.5 million and 6.8 million, respectively.