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OTHER BALANCE SHEET DETAILS - Summary of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Customer Refund Liability, Current | $ 0 | $ 5,000
Accrued research and development expenses | 4,878 | 4,257
Operating lease liabilities – current | 4,026 | 3,690
Accrued professional fees | 869 | 1,532
Other accrued liabilities | 1,804 | 4,133
Total other accrued liabilities | $ 11,577 | $ 18,612
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Total other accrued liabilities | Total other accrued liabilities

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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