Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Activity for All Restricted Stock Units ("RSUs") (Details)

v3.10.0.1
Stock-Based Compensation - Summary of Activity for All Restricted Stock Units ("RSUs") (Details) - Restricted Stock Units (RSUs)
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Number of awards, unvested, balance (in units) | shares 5,330
Number of awards, granted (in units) | shares 1,909
Number of awards, issued (in units) | shares (1,451)
Number of awards, forfeited (in units) | shares (1,170)
Number of awards, unvested, balance (in units) | shares 4,618
Weighted-average grant date fair value, unvested, beginning balance (in dollars per unit) | $ / shares $ 5.82
Weighted-average grant date fair value, granted (in dollars per unit) | $ / shares 8.54
Weighted-average grant date fair value, issued (in dollars per unit) | $ / shares 6.45
Weighted-average grant date fair value, forfeited (in dollars per unit) | $ / shares 5.62
Weighted-average grant date fair value, unvested, ending balance (in dollars per unit) | $ / shares $ 6.80