Concepts from games don't return site_detail_url

So I'm getting a list of concepts attached to a game, but the concepts aren't giving me site_detail_urls what with to link to the associated Giant Bomb page. Here's what I'm getting: 
  
 Array
(
    [api_detail_url] => http://api.giantbomb.com/concept/1/
    [id] => 1
    [name] => Double Jump
)
Array
(
    [api_detail_url] => http://api.giantbomb.com/concept/299/
    [id] => 299
    [name] => Side-Scrolling
)
Array
(
    [api_detail_url] => http://api.giantbomb.com/concept/700/
    [id] => 700
    [name] => Power Up
)      

Do I need to make a separate API call for each and every concept? That seems like madness.