Document and Entity Information
Jan. 04, 2022
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001433714
Document Type 8-K
Document Period End Date Jan. 04, 2022
Entity Registrant Name CASTLIGHT HEALTH, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-36330
Entity Tax Identification Number 26-1989091
Entity Address, Address Line One 150 Spear Street
Entity Address, Address Line Two Suite 400
Entity Address, City or Town San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94105
City Area Code (415)
Local Phone Number 829-1400
Security 12b Title Class B Common Stock, par value $0.0001 per share
Trading Symbol CSLT
Security Exchange Name NYSE
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false