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    <link:label id="lab_us-gaap_AssetsCurrentAbstract_493F9388D5B1EEDED642769AE4ED7E31_terseLabel_en-US" xlink:label="lab_us-gaap_AssetsCurrentAbstract_493F9388D5B1EEDED642769AE4ED7E31" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Current assets:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_0D97F343B9F62D507210769AE527EBE4" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsReceivable_EBA5C482ABC2162B0A9F769AE5288C61" xlink:type="locator" />
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