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Related Party Transactions - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 10, 2021 USD ($) | Aug. 31, 2021 USD ($) | Feb. 29, 2020 USD ($) shares | Feb. 28, 2019 USD ($) shares | Jun. 30, 2018 USD ($) shares | Apr. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) Facility shares | Sep. 30, 2020 USD ($) | Mar. 16, 2020 USD ($) | Oct. 26, 2016 USD ($) | Aug. 31, 2015 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Facilities | Facility |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Preferred stock, shares issued | shares |  |  | 3,764,606,000 | 3,764,606,000 |  |  | 0 |  |  | 0 |  |  |  |
Preferred stock shares sold | shares |  |  | 501,947,000 | 501,947,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  | $ 85,000 | $ 85,000 |  |  |  |  |  |  |  |  |  |
Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  |  |  |  | 775,146,000 |  |  |  |  |  |  |  |
Preferred stock shares sold | shares |  |  |  |  |  | 775,146,000 |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |
Notes Payable - Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.00%
Debt instrument, outstanding amount |  |  |  |  |  |  | $ 1,100 |  |  | $ 1,100 |  |  |  |
Interest expense, borrowings |  |  |  |  |  |  | $ 50 | $ 50 |  | $ 130 | $ 130 |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100
First American Financial Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 5.00% |  |  | 5.00% |  |  |  |
Fees paid for services |  |  |  |  |  |  | $ 3,200 | 1,300 |  | $ 7,500 | 5,700 |  |  |
LL Capital Partners I, L.P |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right outstanding | shares |  |  |  |  |  | 250,552,000 |  |  |  |  |  |  |  |
Warrants exercisable | $ / shares |  |  |  |  |  | $ 6.4504 |  |  |  |  |  |  |  |
LL Capital Partners I, L.P | Series B Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | shares |  |  |  |  | 4,650,874,000 | 4,650,874,000 |  |  |  |  |  |  |  |
Preferred stock shares sold | shares |  |  |  |  | 2,325,437,000 | 2,325,437,000 |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity |  |  |  |  | $ 45,000 | $ 45,000 |  |  |  |  |  |  |  |
Senior Secured Credit Line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Facilities | Facility |  |  |  |  |  |  |  |  |  | 1 |  |  |  |
Mezzanine facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Facilities | Facility |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
L L Funds Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |
Interest expense, borrowings |  |  |  |  |  |  | 2,600 | 1,000 |  | $ 5,800 | 6,400 |  |  |
L L Funds Loan Agreement | Senior Secured Credit Line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000 |
L L Funds Loan Agreement | Mezzanine Secured Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,450 |
L L Funds Loan Agreement | London Interbank Offered Rate (LIBOR) | Senior Secured Credit Line |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |
L L Funds Loan Agreement | London Interbank Offered Rate (LIBOR) | Mezzanine Secured Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 13.00% |
LL Mezz Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Maximum principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 31,250 |  |
Interest expense, borrowings |  |  |  |  |  |  | 900 | $ 100 |  | 1,600 | $ 300 |  |  |
LL Mezz Loan Agreement | Mezzanine Secured Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 13.00% |  |
Loan and Security Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, Expiration period | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit additional borrowing capacity | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, borrowings |  |  |  |  |  |  | $ 20 |  |  | $ 20 |  |  |  |
Loan and Security Agreement | Mezzanine facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage | 13.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, outstanding amount | $ 37,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowing capacity | $ 12,500 |  |  |  |  |  |  |  |  |  |  |  |  |
First American Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Interest Rate Stated Percentage |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |
Outstanding amount |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |
Line of credit additional borrowing capacity |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowing outstanding |  | $ 55,000 |  |  |  |  |  |  |  |  |  |  |  |
First American Credit Agreement [Member] | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |

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