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Description of Business and Summary of Significant Accounting Policies - Merger (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 23, 2020 tranche D $ / shares shares | Jul. 30, 2020 USD ($) $ / shares shares | Mar. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Jul. 29, 2020 shares
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Trust fund | $ |  |  | $ 222,948 | $ 196,046 | $ 4,179 |
Common stock, shares outstanding | shares |  | 21,562,100 | 91,455,732 | 81,669,151 | 34,197,822 |
Common stock, shares issued | shares |  |  | 91,455,732 | 81,669,151 | 34,197,822 | 21,562,100
Vesting percentage |  |  | 25.00% | 25.00% |  |
Earn out shares issued | shares |  | 150,000 |  |  |  |
Earnout liability Assumed | $ |  |  |  | $ 50,238 |  |
Transaction costs | $ |  | $ 30,800 |  |  |  |
Acquisition related costs | $ |  | 3,800 |  |  |  |
Merger transaction cost | $ |  | 5,600 |  |  |  |
Contributed capital | $ |  | 239,700 |  |  |  |
Payment of capital distribution | $ |  | $ 50,400 |  |  |  |
Private warrants liability | $ |  |  | $ 47,444 | 31,534 |  |
Impairment loss | $ |  |  |  | 0 | $ 0 |
Cash balance at bank | $ |  |  |  | 206,000 |  |
Percentage of shares held by pre closing holders | 55.00% | 55.00% |  |  |  |
Additional share issued | shares |  | 1,580,000 |  |  |  |
Fair value of additional share issued | $ |  | $ 23,300 |  |  |  |
Fair value of earn out shares | $ |  | 1,900 |  |  |  |
Eligibility amount | $ |  | $ 27,000 |  |  |  |
Additional Offering, PIPE Investors |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Common stock, shares issued | shares |  | 15,000,000 |  |  |  |
Shares issued Price (Per share) | $ / shares |  | $ 10.00 |  |  |  |
Net proceeds | $ |  | $ 141,800 |  |  |  |
Direct offering costs | $ |  | 8,200 |  |  |  |
Earnout shares |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Shares issued (shares) | shares | 6,000,000 |  |  |  |  |
Vesting percentage | 33.33% |  |  |  |  |
Number of tranches | tranche | 3 |  |  |  |  |
Threshold trading days | D | 20 |  |  |  |  |
Threshold consecutive trading days | D | 30 |  |  |  |  |
Threshold period | 36 months |  |  |  |  |
Earnout shares | Common stock is greater than or equal to $18.00 |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Threshold closing price of common stock | $ / shares | $ 18.00 |  |  |  |  |
Earnout shares | Common stock is greater than or equal to $20.00 |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Threshold closing price of common stock | $ / shares | 20.00 |  |  |  |  |
Earnout shares | Common stock is greater than or equal to $22.00 |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Threshold closing price of common stock | $ / shares | $ 22.00 |  |  |  |  |
Private Warrants |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Private warrants liability | $ |  | 34,000 |  |  |  |
PropTech Acquisition Corporation |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Working capital | $ |  | 600 |  |  |  |
Payment of Liabilities | $ |  | 4,300 |  |  |  |
Proceeds available for use | $ |  | 305,100 |  |  |  |
Payment of capital distribution | $ |  | 30,000 |  |  |  |
Net assets | $ |  | 275,100 |  | $ 275,100 |  |
PropTech Acquisition Corporation | Original public offering |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Working capital | $ |  | $ 6,000 |  |  |  |
Merger Agreement |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Shares Redeemed | shares |  | 400 |  |  |  |
Redemption price (per share) | $ / shares |  | $ 10.04 |  |  |  |
Trust fund | $ |  | $ 173,100 |  |  |  |
Common stock, shares outstanding | shares |  | 17,249,600 |  |  |  |
Shares converted | shares | 4,312,500 | 4,312,500 |  |  |  |
Shares conversion ratio | 1 | 1 |  |  |  |
Class of warrant or right, outstanding | shares |  | 14,325,000 |  |  |  |
Shares issued on conversion | shares |  | 184,652 |  |  |  |
Warrants canceled | shares |  | 3,116,003 |  |  |  |
Issued for cancellation of warrants | shares |  | 5,126,128 |  |  |  |
Common stock issued on extinguishment of stock options | shares |  | 2,533,016 |  |  |  |
Shares issued value in merger | $ |  | $ 30,000 |  |  |  |
Shares issued shares in merger | shares |  | 83,559,663 |  |  |  |
Earn out shares issued | shares |  | 5,000,000 |  |  |  |
Eligibility amount | $ |  | $ 27,000 |  |  |  |
Number of single share price | $ / shares |  | $ 1 |  |  |  |
Share price per share | $ / shares |  | $ 11.50 |  |  |  |
Number of days for determining share price commencement |  | 30 days |  |  |  |
Merger Agreement | CEO |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Shares issued shares in merger | shares |  | 1,000,000 |  |  |  |
Merger Agreement | Common stock warrants |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Class of warrant or right, outstanding | shares | 14,235,000 |  |  |  |  |
Issued for cancellation of warrants | shares |  | 4,472,695 |  |  |  |
Merger Agreement | Private Warrants |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Class of warrant or right, outstanding | shares | 5,700,000 | 5,700,000 |  |  |  |
Merger Agreement | Public Warrants |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Class of warrant or right, outstanding | shares | 8,625,000 | 8,625,000 |  |  |  |
Merger Agreement | Preferred stock |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Shares converted | shares |  | 52,251,876 |  |  |  |
Shares issued on conversion | shares |  | 52,207,029 |  |  |  |
Common stock issued on extinguishment of stock options | shares |  | 2,316,280 |  |  |  |
Merger Agreement | PropTech Acquisition Corporation |  |  |  |  |  |
Common Stock and Redeemable Convertible Preferred Stock |  |  |  |  |  |
Shares issued (shares) | shares |  | 36,264,984 |  |  |  |

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