Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - RSU Activity (Details)

v3.10.0.1
Stock-based Compensation - RSU Activity (Details) - Restricted Stock Units (RSUs) [Member]
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares, Unvested balance at January 1, 2018 | shares 18,480
Number of Shares, Vested | shares (17,614)
Number of Shares, Unvested balance at June 30, 2018 | shares 866
Weighted-Average Grant-Date Fair Value, Unvested balance at January 1, 2018 | $ / shares $ 18.00
Weighted-Average Grant-Date Fair Value, Vested | $ / shares 18.54
Weighted-Average Grant-Date Fair Value, Unvested balance at June 30, 2018 | $ / shares $ 7.02