Selected Quarterly Financial Data (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Selected Quarterly Financial Data [Abstract]
Research and development costs reclassified to general and administrative costs	$ 0.3	$ 0.2	$ 0.1

Research and development costs reclassified to general and administrative costs.

No definition available.

Name:	plse_ResearchAndDevelopmentCostsReclassifiedToGeneralAndAdministrativeCosts
Namespace Prefix:	plse_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration