Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - RSU Activity (Details)

v3.8.0.1
Stock-based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member]
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Unvested at January 1, 2017 | shares 91,228
Number of Shares, Granted | shares 11,799
Number of Shares, Vested | shares (60,886)
Number of Shares, Forfeited | shares (22,142)
Number of Shares, Unvested at September 30, 2017 | shares 19,999
Weighted-Average Grant-Date Fair Value, Unvested at January 1, 2017 | $ / shares $ 39.82
Weighted-Average Grant-Date Fair Value, Granted | $ / shares 4.67
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 37.12
Weighted-Average Grant-Date Fair Value, Forfeited | $ / shares 45.45
Weighted-Average Grant-Date Fair Value, Unvested at September 30, 2017 | $ / shares $ 21.04