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Summary of Significant Accounting Policies - Additional Information (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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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 |  |  |  |  |
[1] | The amounts were computed independently for each quarter, and the sum of the quarters may not total the annual amounts.

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