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Bank Loans and Line of Credit (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Sep. 12, 2019 | Aug. 09, 2019 | Nov. 06, 2018 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | Jan. 31, 2022 | Nov. 30, 2021 | Jun. 30, 2021 | Feb. 05, 2020
Bank Of China | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 2,800 |  | $ 8,900 |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 2,800 |  | 8,900 |  |  |  |  |  |  |  |  |  |
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 5,800 |  |  |  |  |  | $ 3,100 |  |  |  |  |  |  |  |
Variable rate spread (as a percent) |  |  |  |  |  |  | 4.70% | 3.85% |  |  |  |  |  |  |  |
Repayments of line of credit |  |  |  |  | $ 3,100 |  | $ 5,600 |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 2,700 |  |  |  |  |  |  |  |  |  | $ 5,800 |
Proceeds from credit facility | $ 2,800 | $ 2,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  |  | $ 2,700 |  |  |  |  |  |  |  |  |  | $ 5,800 |
Interest rate |  |  |  |  | 3.85% |  |  |  |  |  |  |  |  |  | 4.70% |
Combined loan totals |  |  |  |  |  |  | 5,600 |  |  |  |  |  |  |  |  |
Renewal period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Additional loan borrowed |  |  |  |  |  |  | $ 2,700 |  |  |  |  |  |  |  |  |
Repayments of loan |  |  |  |  |  |  |  |  | $ 5,900 |  |  |  |  |  |  |
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,400 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 4.55% |  |  |
Bank Of China | Secured Debt | Beijing Tongmei Xtal Technology | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread (as a percent) |  | 0.40% |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |
ICBC | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 1,600 |  | 1,500 |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 1,600 |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
ICBC | Secured Debt | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
ICBC | Secured Debt | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 1,400 |  |  |  |  |
Annual interest rate at end |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |  |  |
Repayments of line of credit |  |  |  | 1,600 |  | $ 400 |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 1,600 |  | 1,500 |  |  |  |  |  |  |  |  |  |
Proceeds from lines of credit |  |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |
Combined loans renewed |  |  |  | $ 1,600 |  | $ 1,500 |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.92% |  |  |  |  |  |  |  |  |  |  |  |
ICBC | Secured Debt | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread (as a percent) |  |  |  |  |  | 0.07% |  |  |  |  | 0.15% |  |  |  |  |
Wells Fargo Bank | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000
Loans outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Letters of credit outstanding |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Wells Fargo Bank | Secured Debt | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate spread (as a percent) |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Wells Fargo Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Combined loans renewed |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Bank of Communications | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | $ 4,700 |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |  |
Bank of Communications | Secured Debt | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 3,100 |  |  |  |  |  |  |  |  | $ 1,600 |  |
Letters of credit outstanding |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 4,700 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |
Bank of Communications | Secured Debt | Beijing Tongmei Xtal Technology | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100 |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.30% |  |  |
China Merchants Bank | Secured Debt | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
China Merchants Bank | Secured Debt | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 3.55% |  |  |  |  |  |  |  |  |  |  |  |
Guarantee fee (as a percent) |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
Amount of guarantee fee |  |  |  | $ 24 |  |  |  |  |  |  |  |  |  |  |  |
China Merchants Bank | Unsecured Debt | Lines OF Credit, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Combined loans renewed |  |  |  | 1,600 |  |  |  |  |  |  |  |  |  |  |  |
China Merchants Bank | Unsecured Debt | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 4.22% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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