XML 80 R59.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-based Compensation - Stock Option Activity (Details)
 12 Months Ended
Dec. 31, 2017
$ / shares
shares
Options [Roll Forward]  
Balance as of January 1, 2017 (in shares) | shares 636,112
Granted (in shares) | shares 710,600
Expired (in shares) | shares (19,450)
Cancelled/forfeited (in shares) | shares (316,944)
Balance as of December 31, 2017 (in shares) | shares 1,010,318
Weighted Average Exercise Price [Roll Forward]  
Balance as of January 1, 2017 (in dollars per share) | $ / shares $ 24.39
Granted (in dollars per share) | $ / shares 1.47
Expired (in dollars per share) | $ / shares 82.46
Cancelled/forfeited (in dollars per share) | $ / shares 9.06
Balance as of December 31, 2017 (in dollars per share) | $ / shares $ 11.96