Unable to download htmlawed via composer

When tried to download htmlawed via composer.json, the module is not downloaded. Not sure if this is because the type is listed as "metapackage" instead of "drupal-module".

composer.json
"drupal/htmlawed": "^3.7",

composer.lock

{
    "name": "drupal/htmlawed",
    "version": "3.7.0",
    "require": {
        "drupal/drupal": "~7.0",
        "drupal/htmlawed": "self.version"
    },
    "type": "metapackage",
    "extra": {
        "branch-alias": {
            "dev-3.x": "3.x-dev"
        },
        "drupal": {
            "version": "7.x-3.7",
            "datestamp": "1512623585",
            "security-coverage": {
                "status": "covered",
                "message": "Covered by Drupal's security advisory policy"
            }
        }
    },
    "notification-url": "https://packages.drupal.org/7/downloads",
    "license": [
        "GPL-2.0-or-later"
    ],
    "authors": [
        {
            "name": "alpha2zee",
            "homepage": "https://www.drupal.org/user/201451"
        }
    ],
    "homepage": "https://www.drupal.org/project/htmlawed",
    "support": {
        "source": "https://git.drupalcode.org/project/htmlawed"
    }
},

composer show -a drupal/htmlawed
name     : drupal/htmlawed
descrip. :
keywords :
versions : 3.x-dev, 3.7.0, 3.6.0, 3.5.0, 3.4.0, 3.3.0, 3.2.0, 3.1.0, 3.0.0, 2.x-dev, dev-3.x, dev-2.x
type     : metapackage
license  : GNU General Public License v2.0 or later (GPL-2.0-or-later) (OSI approved) https://spdx.org/licenses/GPL-2.0-or-later.html#licenseText
source   : []
dist     : []
names    : drupal/htmlawed

support
source : https://git.drupalcode.org/project/htmlawed

requires
drupal/htmlawed 3.x-dev
drupal/drupal ~7.0