Commitments and Contingencies (Details)	1 Months Ended
	Feb. 28, 2020 numberOfLawsuits	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Other Commitments [Line Items]
Reserves recorded		$ 0	$ 0
Subsequent Event
Other Commitments [Line Items]
Loss Contingency, Number Of Lawsuits | numberOfLawsuits	7
Loss Contingency, Number Of Lawsuits, Putative Class Action | numberOfLawsuits	2
Loss Contingency, Number Of Lawsuits, Individual | numberOfLawsuits	5
Former Headquarters New York, NY 1
Other Commitments [Line Items]
Outstanding letters of credit		300,000	300,000
Office Space Mountain View, CA
Other Commitments [Line Items]
Outstanding letters of credit		320,000	320,000
Former Headquarters New York, NY 2
Other Commitments [Line Items]
Outstanding letters of credit		1,814,000	$ 2,332,000
Current Headquarters New York, NY
Other Commitments [Line Items]
Outstanding letters of credit		$ 633,000