| Long-Term Debt - Summary of Long-term Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | 
|---|---|---|
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | $ 71,512 | $ 31,443 | 
| Less: Debt issuance costs | (26,291) | (4,798) | 
| Non-current portion of long-term debt | 45,221 | 26,645 | 
| Eastward Loan Facility [Member] | ||
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | 15,000 | |
| EIB Loan Facility [Member] | ||
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | 14,734 | |
| PPP Loan [Member] | ||
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | 1,699 | |
| FP Term Loan [Member] | ||
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | 71,512 | 0 | 
| Other [Member] | ||
| Debt Instrument [Line Items] | ||
| Long-term Debt, Gross | $ 10 | 
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef 
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- Definition Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt classified as noncurrent. Excludes lease obligation. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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