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Organization and Summary of Significant Accounting Policies - Narrative (Details) | 1 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($)
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents and marketable securities |  |  | $ 164,007,000 |
Number of reportable segments | segment |  |  | 1 |
Restricted cash |  | $ 1,223,000 | $ 2,150,000 | $ 1,223,000
Rental payments |  | 928,000 |  |
Available letter of credit |  | 1,223,000 |  | 1,223,000
Allowance for doubtful accounts |  | 0 |  | 0
Accounts receivable write-offs |  |  | 0 | 0
Inventory allowance |  | 298,000 | 1,122,000 | 298,000
Impairment charges |  |  | $ 0 | 0
Term of standard product warranties |  |  | 1 year |
Contract assets |  |  | $ 0 |
Interest and penalties recorded related to unrecognized tax benefits |  | $ 0 | $ 0 | $ 0
Minimum |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of property and equipment |  |  | 3 years |
Minimum | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
ROU assets |  |  | $ 16,050,000 |
Maximum |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of property and equipment |  |  | 7 years |
Maximum | Cumulative Effect, Period of Adoption, Adjustment | Pro Forma |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Operating liabilities |  |  | $ 19,692,000 |
Accounts Receivable | Customer Concentration Risk | Customer One |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  | 10.00% | 10.00%
Accounts Receivable | Customer Concentration Risk | Customer Three |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  |  | 10.00%
Accounts Receivable | Customer Concentration Risk | Customer Four |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  |  | 10.00%
Accounts Payable | Supplier Concentration Risk | Vendor One |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  | 10.00% | 10.00%
Accounts Payable | Supplier Concentration Risk | Vendor Two |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  | 10.00% | 10.00%
Accounts Payable | Supplier Concentration Risk | Vendor Three |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Concentration risk percentage (more than) |  |  |  | 10.00%
Letter of Credit |  |  |  |
Organization and Summary of Significant Accounting Policies [Line Items] |  |  |  |
Maximum capacity |  |  | $ 2,150,000 |
Replenishment of letter of credit | $ 928,000 |  |  |

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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + 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 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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