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The Company and Summary of Significant Accounting Policies - Concentration of Revenues and Accounts Receivable (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) customer | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) customer | Dec. 31, 2022 USD ($) customer
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers | $ 3,265 | $ 3,062 | $ 16,028 | $ 16,669
Customer A |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers |  |  |  | 4,639
Accounts Receivable |  |  |  | 1,228
Customer B |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers |  |  | 3,031 | 2,979
Accounts Receivable |  |  | 1,755 | 590
Customer C |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers |  |  |  | 1,712
Accounts Receivable |  |  |  | 1,400
Customer D |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers |  |  |  | 1,670
Accounts Receivable |  |  | 661 | 687
Customer E |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Accounts Receivable |  |  |  | $ 610
Customer F |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Accounts Receivable |  |  | 1,250 |
Customer G |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Revenues from contracts with customers |  |  | 3,000 |
Customer H |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Accounts Receivable |  |  | $ 938 |
Revenue |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer |  |  | 2 | 4
Revenue | Two customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer | 2 |  |  |
Revenue | Four customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer |  |  | 4 |
Revenue | Customer concentration | Two customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  | 38.00% |
Revenue | Customer concentration | Four customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  |  | 66.00%
Revenue | Customer concentration | Customer A |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 61.00% |  | 28.00% |
Revenue | Customer concentration | Customer B |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 24.00% |  | 28.00% |
Revenue | Customer concentration | Customer C |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  | 25.00% |
Revenue | Customer concentration | Customer D |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  | 10.00% |
Accounts receivable |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer |  |  | 4 | 5
Accounts receivable | Four customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Number of customers | customer | 4 |  | 4 |
Accounts receivable | Customer concentration | Four customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  | 70.00% |
Accounts receivable | Customer concentration | Five customers |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage |  |  |  | 90.00%
Accounts receivable | Customer concentration | Customer A |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 28.00% |  | 27.00% |
Accounts receivable | Customer concentration | Customer B |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 19.00% |  | 19.00% |
Accounts receivable | Customer concentration | Customer C |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 18.00% |  | 14.00% |
Accounts receivable | Customer concentration | Customer D |  |  |  |
The Company and Summary of Significant Accounting Policies |  |  |  |
Concentration risk percentage | 13.00% |  | 10.00% |

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