Document and Entity Information - $ / shares	3 Months Ended
	Mar. 31, 2020	May 08, 2020
Cover [Abstract]
Entity Central Index Key	0001551306
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-39100
Entity Registrant Name	Progyny, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	27-2220139
Entity Address, Address Line One	1359 Broadway
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10018
City Area Code	212
Local Phone Number	888-3124
Title of 12(b) Security	Common Stock,$0.0001 par value per share
Trading Symbol	PGNY
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		85,169,405
Entity Listing, Par Value Per Share	$ 0.0001
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false