Required for efficient N-glycosylation. Necessary for maintaining optimal levels of dolichol-linked oligosaccharides. Hydrolyzes dolichyl pyrophosphate at a very high rate and dolichyl monophosphate at a much lower rate. Does not act on phosphatidate (By similarity). . This is the function of Ensembl gene identifier ENSG00000167130 (DOLPP1, dolichyldiphosphatase 1).