Summary of Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	Nov. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Customer	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017 USD ($) Customer	Jan. 01, 2019 USD ($)	Apr. 30, 2017 USD ($)
Deferred costs current		$ 9,900,000	$ 6,500,000	$ 2,429,000
Deferred costs non current		$ 14,200,000	10,300,000
Deferred sales commission cost amortization period		4 years
ROU assets		$ 13,071,000
Lease, liability		15,390,000
Short-term investments		0	45,500,000
Impairment of goodwill	$ 0	$ 0	0	0
Subscription contracts		The Company’s subscription contracts are generally two years or longer in length, billed annually in advance, and non-cancelable.
Advertising expenses		$ 1,900,000	1,400,000	$ 1,200,000
Technology
Acquired finite lived intangible assets, useful life		3 years
Computer and System Software
Property and equipment, useful life in years		3 years
Office Computers
Property and equipment, useful life in years		3 years
Systems Hardware
Property and equipment, useful life in years		5 years
Furniture and Equipment
Property and equipment, useful life in years		5 years
Capitalized Software Development costs
Property and equipment, useful life in years		3 years
April 2017 Offering
Deferred offering costs						$ 600,000
January 2019 Offering
Deferred offering costs		$ 100,000	$ 300,000
Customer Concentration Risk | Revenue
Number of customers above 10% threshold | Customer		0	0	0
Customer Concentration Risk | Accounts Receivable
Number of customers above 10% threshold | Customer		0	0	0
Minimum
Estimated useful life		1 year
Subscription contracts term		2 years
Minimum | Tradenames
Acquired finite lived intangible assets, useful life		1 year
Minimum | Customer Relationships
Acquired finite lived intangible assets, useful life		5 years
Maximum
Cash and cash equivalent, FDIC insured amount		$ 250,000
Estimated useful life		7 years
Maximum | Tradenames
Acquired finite lived intangible assets, useful life		7 years
Maximum | Customer Relationships
Acquired finite lived intangible assets, useful life		7 years
ASU 2016-02 [Member]
ROU assets					$ 14,700,000
Lease, liability					16,900,000
Deferred rent liability reversed to right-of-use asset upon adoption					$ 2,200,000