Commitments and Contingencies - Additional Information (Detail)
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12 Months Ended |
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Jan. 01, 2021
USD ($)
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Dec. 31, 2021
USD ($)
claim
vehicle
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Dec. 31, 2020
USD ($)
claim
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Apr. 14, 2020
USD ($)
ft²
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Dec. 31, 2019 |
Oct. 03, 2019
USD ($)
ft²
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| Loss Contingencies [Line Items] |
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| Weighted Average Remaining Lease Term (in years) |
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3 years 6 months 29 days
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4 years 5 months 4 days
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| Vehicles delivered | vehicle |
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72
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| Restricted cash |
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$ 5,056,000
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$ 22,559,000
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| Square footage | ft² |
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8,816
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24,474
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| Renewal period |
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5 years
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| Purchase obligation, purchases during the period |
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$ 3,000,000
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3,700,000
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| Claims | claim |
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0
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| Rush University | Maximum |
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| Loss Contingencies [Line Items] |
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| Maximum earned royalties |
$ 100,000
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| Rush University | Royalty Agreement Terms |
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| Loss Contingencies [Line Items] |
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| Minimum annual royalty amount |
$ 100,000
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| Royalty cost |
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$ 200,000
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$ 0
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| Securities Deposit |
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| Loss Contingencies [Line Items] |
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| Claims | claim |
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0
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| Letter of Credit |
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| Loss Contingencies [Line Items] |
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| Security deposit |
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$ 50,000
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$ 750,000
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| Fleet lease | Letter of Credit |
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| Loss Contingencies [Line Items] |
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| Security deposit |
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300,000
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| Office lease | Letter of Credit |
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| Loss Contingencies [Line Items] |
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| Security deposit |
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800,000
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| Securities Deposit | Fleet lease |
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| Loss Contingencies [Line Items] |
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| Restricted cash |
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300,000
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$ 300,000
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| Securities Deposit | Office lease |
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| Loss Contingencies [Line Items] |
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| Restricted cash |
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$ 800,000
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$ 800,000
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| Lease Contract Term One | Fleet lease |
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| Loss Contingencies [Line Items] |
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| Weighted Average Remaining Lease Term (in years) |
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24 months
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| Lease Contract Term Two | Fleet lease |
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| Loss Contingencies [Line Items] |
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| Weighted Average Remaining Lease Term (in years) |
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36 months
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