Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share Antidilutive Securities (Details)

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Net Income (Loss) Per Share Antidilutive Securities (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common share equivalents for securities that were anti-dilutive and therefore excluded from the computation of diluted earnings per share      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 8,263,826 6,764,525 7,671,274
Stock options      
Common share equivalents for securities that were anti-dilutive and therefore excluded from the computation of diluted earnings per share      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0 2,254,565 3,033,194
Unvested restricted stock units and awards      
Common share equivalents for securities that were anti-dilutive and therefore excluded from the computation of diluted earnings per share      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 0 1,766,639 1,894,759
Warrants - private placement      
Common share equivalents for securities that were anti-dilutive and therefore excluded from the computation of diluted earnings per share      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 470,000 0 0
Convertible Notes      
Common share equivalents for securities that were anti-dilutive and therefore excluded from the computation of diluted earnings per share      
Anti-dilutive securities excluded from computation of diluted earnings per share (in shares) 7,793,826 2,743,321 2,743,321