private function _setDetails(array $data)
 {
     $this->_fieldCrawler->build($this->_product->type);
     $details = new Product\Type\DetailCollection();
     foreach ($this->_fieldCrawler as $name => $field) {
         $value = $data[$this->_headingKeys->getKey($name)];
         if ('' !== (string) $value) {
             $field->setValue($value);
             $details->{$name} = $field;
         }
     }
     $this->_product->setDetails($details);
 }