Summary of Significant Accounting Policies - Additional Information (Detail)
|
3 Months Ended |
12 Months Ended |
|
|
|
Dec. 31, 2020
USD ($)
|
Dec. 31, 2021
USD ($)
segment
|
Dec. 31, 2020
USD ($)
|
Apr. 14, 2020
USD ($)
|
Oct. 03, 2019
USD ($)
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Number of operating segments | segment |
|
1
|
|
|
|
| Restricted cash |
$ 22,559,000
|
$ 5,056,000
|
$ 22,559,000
|
|
|
| Proceeds received from issuance of convertible unsecured promissory notes |
25,000,000
|
|
|
|
|
| Operating lease right-of-use assets |
6,856,000
|
5,395,000
|
6,856,000
|
|
|
| Operating lease liability |
8,300,000
|
$ 6,756,000
|
$ 8,300,000
|
|
|
| Revenue Benchmark | Customer Concentration Risk | Three Largest Customers |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Concentration risk (percent) |
|
75.00%
|
92.00%
|
|
|
| Accounts Receivable | Customer Concentration Risk | Three Largest Customers |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Concentration risk (percent) |
|
75.00%
|
95.00%
|
|
|
| Convertible Notes Payable |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Restricted cash |
$ 4,700,000
|
|
$ 4,700,000
|
|
|
| Letter of Credit |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Deposit |
|
|
|
$ 50,000
|
$ 750,000
|
| Office lease | Letter of Credit |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Deposit |
|
$ 800,000
|
|
|
|
| Fleet lease | Letter of Credit |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Deposit |
|
$ 300,000
|
|
|
|
| Minimum |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Useful life |
|
3 years
|
|
|
|
| Maximum |
|
|
|
|
|
| Property, Plant and Equipment [Line Items] |
|
|
|
|
|
| Useful life |
|
5 years
|
|
|
|