Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Stock Option Activity (Details)

v3.8.0.1
Stock-based Compensation - Stock Option Activity (Details) - Stock Options [Member]
$ / shares in Units, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Options, Outstanding at January 1, 2017 | shares 568,292
Options, Granted | shares 1,095,722
Options, Exercised | shares (6,458)
Options, Forfeited, expired or cancelled | shares (189,141)
Options, Outstanding at September 30, 2017 | shares 1,468,415
Options, Exercisable at September 30, 2017 | shares 399,969
Weighted Average Exercise Price Per Share, Outstanding at January 1, 2017 | $ / shares $ 77.70
Weighted Average Exercise Price Per Share, Granted | $ / shares 5.08
Weighted Average Exercise Price Per Share, Exercised | $ / shares 4.50
Weighted Average Exercise Price Per Share, Forfeited, expired or cancelled | $ / shares 58.28
Weighted Average Exercise Price Per Share, Outstanding at September 30, 2017 | $ / shares 26.33
Weighted Average Exercise Price Per Share, Exercisable at September 30, 2017 | $ / shares $ 81.48
Weighted Average Remaining Contractual Life (in years), Outstanding at September 30, 2017 8 years 6 months 21 days
Weighted Average Remaining Contractual Life (in years), Exercisable at September 30, 2017 6 years 4 months 20 days
Aggregate Intrinsic Value, Outstanding at September 30, 2017 | $ $ 17,448
Aggregate Intrinsic Value, Exercisable at September 30, 2017 | $ $ 2,120