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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On October 1, 2019, the Company acquired 100% of the outstanding membership interests of TOPO Research LLC ("TOPO"), a privately-held company based in Redwood City, California, for an aggregate purchase price of $33 million (subject to certain working capital and other customary post-closing adjustments). TOPO is a subscription-based research and advisory business that helps sales leaders at the world’s fastest-growing companies achieve their growth objectives. The operating results of TOPO are included in the Company's consolidated financial statements beginning on the date of acquisition.