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Summary of Significant Accounting Policies - Additional Information (Details)				3 Months Ended																12 Months Ended
	Dec. 19, 2019 ft²	May 01, 2019	Aug. 12, 2013 ft²	Dec. 31, 2019 USD ($) $ / shares		Sep. 30, 2019 USD ($) $ / shares		Jun. 30, 2019 USD ($) $ / shares		Mar. 31, 2019 USD ($) $ / shares		Dec. 31, 2018 USD ($) $ / shares		Sep. 30, 2018 USD ($) $ / shares		Jun. 30, 2018 USD ($) $ / shares		Mar. 31, 2018 USD ($) $ / shares		Dec. 31, 2019 USD ($) Customer ReportingUnit $ / shares shares	Dec. 31, 2018 USD ($) Customer $ / shares shares	Dec. 31, 2017 USD ($) Customer $ / shares shares	Aug. 30, 2019 ft²	Jan. 01, 2019 USD ($)	Jun. 19, 2018 ft²	Jan. 01, 2018 USD ($)	Oct. 11, 2017 USD ($)	Jul. 30, 2016 ft²	Oct. 08, 2014 ft²
Summary Of Significant Accounting Policies [Line Items]
Payment of revenue, performance obligation, description of payment terms																				thirty to sixty
Costs to obtain a contract				$ 20,058,000								$ 12,505,000								$ 20,058,000	$ 12,505,000					$ 3,207,000
Amortization of deferred contract costs																				8,416,000	3,689,000
Accounts receivable, net				22,124,000								13,614,000								22,124,000	13,614,000	$ 12,577,000				13,390,000
Reduction to accumulated deficit				(51,859,000)								(9,713,000)								(51,859,000)	(9,713,000)	58,499,000
Assets				393,623,000								268,290,000								393,623,000	268,290,000	176,594,000
Liabilities				136,768,000								74,179,000								136,768,000	74,179,000	49,569,000
Revenue				$ 158,153,000		$ 150,462,000		$ 145,031,000		$ 135,270,000		$ 126,090,000		$ 119,125,000		$ 110,296,000		$ 98,575,000		588,916,000	454,086,000	316,861,000
Sales and marketing																				393,844,000	315,939,000	236,165,000
Income before income taxes																				38,705,000	25,484,000	15,837,000
(Benefit from) provision for income taxes																				$ (3,441,000)	$ (39,686,000)	$ 2,638,000
Basic net income per share | $ / shares				$ 0.12	[1]	$ 0.09	[1]	$ 0.05	[1]	$ 0.11	[1]	$ 0.11	[1]	$ 0.13	[1]	$ 0.31	[1]	$ 0.05	[1]	$ 0.38	$ 0.60	$ 0.13
Diluted net income per share | $ / shares				$ 0.12	[1]	$ 0.09	[1]	$ 0.05	[1]	$ 0.11	[1]	$ 0.11	[1]	$ 0.12	[1]	$ 0.29	[1]	$ 0.05	[1]	$ 0.37	$ 0.57	$ 0.12
Revenue recognized																				$ 8,811,000	$ 4,305,000
Performance obligation unsatisfied				$ 35,000,000.0																$ 35,000,000.0
Description of significant off-balance sheet risk																				The Company has no significant off‑balance sheet risk, such as foreign exchange contracts, option contracts, or other foreign hedging arrangements.
Amortization (accretion) of premiums or discounts																				$ 0	0
Realized gains or losses on investments																				0	0	$ 0
Other than temporary impairments recognized in statements of operations																				0	0
Restricted cash				10,803,000								$ 2,671,000								10,803,000	2,671,000
Impairment of long lived assets																				$ 0	0	$ 0
Number of reporting units | ReportingUnit																				2
Liabilities for uncertain tax positions				0								0								$ 0	$ 0
Unrecognized stock-based compensation expense related to stock-based awards																											$ 2,500,000
Options granted during period | shares																				0	0	0
Advertising expense																				$ 287,107,000	$ 238,640,000	$ 173,186,000
Deferred rent and rent incentives, current												1,693,000									1,693,000	1,165,000
Deferred rent and rent incentives, noncurrent												9,395,000									9,395,000	5,648,000
Rent expense																					7,711,000	5,994,000
Cumulative adjustment from adoption of revenue recognition standard																					3,042,000
Net lease assets				59,986,000																59,986,000
Lease liabilities				$ 69,599,000																69,599,000
Lease costs																				$ 10,260,000	7,711,000
Weighted average remaining lease term				8 years 9 months 18 days																8 years 9 months 18 days
Weighted average discount rate				5.20%																5.20%
Future minimum lease payments for leases signed but not yet commenced				$ 317,837,000																$ 317,837,000
Boston, Massachusetts at 1001 Boylston Street
Summary Of Significant Accounting Policies [Line Items]
Operating lease of office space | ft²	273,595
Lessee, operating lease, existence of option to terminate	true
Lessee, operating lease, option to terminate																				The “Commencement Date” of the lease term is the earlier to occur of (i) the date that is twelve months following the Delivery Date (as defined in the lease) and (ii) the date that the Company first occupies the premises for the normal conduct of business for the Permitted Use (as defined in the lease). The initial term will commence on the Commencement Date and expire on the date that is one hundred and eighty full calendar months after the Commencement Date (plus the partial month, if any, immediately following the Commencement Date). The lease provides for the option to terminate early under certain circumstances including if there is a material delay in construction (subject to the terms and conditions of the lease), and contains two Company options to extend the lease term (including for a portion of the office space thereunder) for an additional period of five years.
Operating lease, option to extend																				contains two Company options to extend the lease term (including for a portion of the office space thereunder) for an additional period of five years
Cambridge, Massachusetts at 55 Cambridge Parkway
Summary Of Significant Accounting Policies [Line Items]
Operating lease of office space | ft²																							36,689					51,923
Operating lease, option to extend																				option to extend the lease term with respect to a portion of the office space for an additional period of five years
Needham, Massachusetts
Summary Of Significant Accounting Policies [Line Items]
Lessee, operating lease, existence of option to terminate		true
Lessee, operating lease, renewal term		1 year
Cambridge, Massachusetts at 121 First Street
Summary Of Significant Accounting Policies [Line Items]
Operating lease of office space | ft²																									48,393
Operating lease, option to extend																				option to extend the lease term for two additional periods of five years each.
Dublin, Ireland
Summary Of Significant Accounting Policies [Line Items]
Operating lease of office space | ft²			13,345
Operating lease, rent increasing year			5 years
Cambridge, Massachusetts at 2 Canal Park
Summary Of Significant Accounting Policies [Line Items]
Operating lease of office space | ft²																													48,059
Operating lease, option to extend																				option to extend the lease term for one additional period of five years.
Website and Software Development Costs
Summary Of Significant Accounting Policies [Line Items]
Software and website development costs capitalized				4,176,000								2,012,000								$ 4,176,000	2,012,000
Amortization expense																				$ 1,643,000	$ 1,508,000	$ 812,000
Estimated useful life																				3 years
Internal Use Software
Summary Of Significant Accounting Policies [Line Items]
Amortization expense																				$ 132,000
Estimated useful life																				3 years
Internal Use Software | Other Non-Current Assets
Summary Of Significant Accounting Policies [Line Items]
Software and website development costs capitalized				2,615,000																$ 2,615,000
Internal Use Software | Prepaid Expenses and Prepaid Income Taxes
Summary Of Significant Accounting Policies [Line Items]
Software and website development costs capitalized				616,000																$ 616,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives																				3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Maturity of certificates of deposit, description																				As of December 31, 2019 and 2018, investments consisted of U.S. certificates of deposit (“CDs”) with remaining maturities of less than twelve months.
Maturity period of certificates of deposit																				12 months	12 months
Business acquisition valuation period																				1 year
Estimated useful lives																				11 years
Sales Revenue, Net | Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage																				10.00%	10.00%	10.00%
Number of major customers | Customer																				0	0	0
Net Accounts Receivable | Advertising Customers
Summary Of Significant Accounting Policies [Line Items]
Unbilled accounts receivables				$ 8,880,000								5,814,000								$ 8,880,000	$ 5,814,000
Net Accounts Receivable | Concentration of Credit Risk
Summary Of Significant Accounting Policies [Line Items]
Number of major customers | Customer																				1	2
Net Accounts Receivable | Concentration of Credit Risk | Customer One
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage																				18.00%	21.00%
Net Accounts Receivable | Concentration of Credit Risk | Customer Two
Summary Of Significant Accounting Policies [Line Items]
Concentration of credit risk, percentage																					14.00%
Commission Contract | Restatement Adjustment
Summary Of Significant Accounting Policies [Line Items]
Reduction to accumulated deficit																										3,207,000
Marketplace Subscription Revenue
Summary Of Significant Accounting Policies [Line Items]
Revenue																				$ 526,043,000	$ 405,780,000	$ 282,664,000
ASC 606
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, net																										13,390,000
Reduction to accumulated deficit																										55,457,000
Assets																										179,789,000
Liabilities																										49,722,000
Deferred rent and rent incentives, current																										1,165,000
Deferred rent and rent incentives, noncurrent																										5,648,000
ASC 606 | Adjustments
Summary Of Significant Accounting Policies [Line Items]
Costs to obtain a contract												12,505,000									12,505,000
Reduction to deferred tax assets																										978,000
Assets												10,030,000									10,030,000
Liabilities												0									0
Revenue																					126,000
Sales and marketing																					(9,298,000)
Income before income taxes																					9,424,000
(Benefit from) provision for income taxes																					$ 2,436,000
Basic net income per share | $ / shares																					$ 0.07
Diluted net income per share | $ / shares																					$ 0.06
ASC 606 | Marketplace Subscription Revenue | Adjustments
Summary Of Significant Accounting Policies [Line Items]
Accounts receivable, net												939,000									$ 939,000					813,000
Reduction to accumulated deficit												(712,000)									(712,000)					(623,000)
Assets												712,000									712,000					$ 623,000
Revenue																					126,000
Income before income taxes																					126,000
(Benefit from) provision for income taxes																					37,000
Accounting Standards Update 2016-09
Summary Of Significant Accounting Policies [Line Items]
(Benefit from) provision for income taxes																				(11,115,000)	(40,765,000)	$ (681,000)
ASC 842
Summary Of Significant Accounting Policies [Line Items]
Deferred rent and rent incentives												11,088,000									11,088,000
Deferred rent and rent incentives, current												1,693,000									1,693,000
Deferred rent and rent incentives, noncurrent												$ 9,395,000									$ 9,395,000
Cumulative adjustment from adoption of revenue recognition standard																				$ 0
Net lease assets																								$ 52,334,000
Lease liabilities																								$ 63,280,000
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