Deferred taxes are accounted for under ASC 740. Before 2016, companies split deferred tax assets and liabilities between current and noncurrent based on the classification of the asset or liability that gave rise to them, such as an allowance for credit losses or an accrued expense. In XBRL the current portion was tagged DeferredTaxAssetsNetCurrent, or DeferredTaxAssetsLiabilitiesNetCurrent when shown after netting against deferred tax liabilities in the same jurisdiction. Either figure was stated after any valuation allowance for benefits not expected to be realized.
ASU 2015-17 simplified the rule by requiring every deferred tax balance to be classified as noncurrent. It took effect for public business entities for annual periods beginning after December 15, 2016, and many companies adopted it early. After adoption, amounts that had been current were combined into the noncurrent deferred tax lines, so a series built from older filings will show short-term deferred tax assets that simply stop, with the balance moving into long-term deferred tax assets rather than disappearing.
For analysis, the break matters mostly in historical comparisons. Current assets and the current ratio of the same company can shift at adoption with no change in the business. Deferred tax assets were never a source of cash in the usual sense; they reduce future tax payments only if the company earns enough taxable income, which is why the size of the valuation allowance, disclosed in the income tax note, is worth checking.