Annual report pursuant to Section 13 and 15(d)

Net Income (Loss) Per Share (Details)

v3.8.0.1
Net Income (Loss) Per Share (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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) 6,764,525 7,671,274 3,383,281
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) 2,254,565 3,033,194 297,343
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) 1,766,639 1,894,759 210,233
Convertible Notes | 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) 2,743,321 2,743,321 2,743,321
Upside Holdings, Inc. | 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)     132,384