Sources have varying suggestions on how long and at what temperature you should bake chicken thighs.
Boneless, skinless thighs cook quickly. This chicken thigh recipe from TheKitchn.com suggests that you place it in the pre-heated oven at 425°F for 20 minutes or until the chicken has an internal temperature of 165°F.
If they are not quite up to temperature, put back in the oven and continue cooking and checking the temperature in 5-minute increments.
Perdue.com also offers the following cooking times for this particular chicken part:
Liven up your dinner table with Delish.com's 20 Easy Chicken Thigh Recipes.