<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:1acd4795-e5ba-40f5-8b83-9a4ca2982f22,g:5deea915-5dcc-4c1e-8bc1-c606fee8581e-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/netLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/net-2009-12-16.xsd#netLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedNetLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedNetLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTerseLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodEndLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodEndLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel"/>
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_ck0001496099_WarrantsMember_label_en-US" xlink:label="lab_ck0001496099_WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants [Member]</link:label>
    <link:label id="lab_ck0001496099_WarrantsMember_documentation_en-US" xlink:label="lab_ck0001496099_WarrantsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Warrants</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001496099_WarrantsMember" xlink:href="ck0001496099-20230517.xsd#ck0001496099_WarrantsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001496099_WarrantsMember" xlink:to="lab_ck0001496099_WarrantsMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001496099_CommonStockMember_label_en-US" xlink:label="lab_ck0001496099_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock [Member]</link:label>
    <link:label id="lab_ck0001496099_CommonStockMember_documentation_en-US" xlink:label="lab_ck0001496099_CommonStockMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Common Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001496099_CommonStockMember" xlink:href="ck0001496099-20230517.xsd#ck0001496099_CommonStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001496099_CommonStockMember" xlink:to="lab_ck0001496099_CommonStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001496099_PreferredStockMember_label_en-US" xlink:label="lab_ck0001496099_PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Stock [Member]</link:label>
    <link:label id="lab_ck0001496099_PreferredStockMember_documentation_en-US" xlink:label="lab_ck0001496099_PreferredStockMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Preferred Stock</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001496099_PreferredStockMember" xlink:href="ck0001496099-20230517.xsd#ck0001496099_PreferredStockMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001496099_PreferredStockMember" xlink:to="lab_ck0001496099_PreferredStockMember" xlink:type="arc" order="1"/>
    <link:label id="lab_ck0001496099_SubscriptionRightsMember_label_en-US" xlink:label="lab_ck0001496099_SubscriptionRightsMember" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subscription Rights [Member]</link:label>
    <link:label id="lab_ck0001496099_SubscriptionRightsMember_documentation_en-US" xlink:label="lab_ck0001496099_SubscriptionRightsMember" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xmlns:xml="http://www.w3.org/XML/1998/namespace" xml:lang="en-US">Subscription Rights</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ck0001496099_SubscriptionRightsMember" xlink:href="ck0001496099-20230517.xsd#ck0001496099_SubscriptionRightsMember"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001496099_SubscriptionRightsMember" xlink:to="lab_ck0001496099_SubscriptionRightsMember" xlink:type="arc" order="1"/>
  </link:labelLink>
</link:linkbase>
