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Related Party Transactions (Details) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 02, 2017 USD ($) | Aug. 31, 2011 USD ($) item | Nov. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) installment | Apr. 30, 2016 USD ($) | Apr. 30, 2014 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) ft² installment | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party notes receivable - long term |  |  |  |  |  |  |  |  | $ 157,000
Area of leased property (in square feet) | ft² |  |  |  |  |  |  |  | 19,467 |
Repayment of related party notes receivable |  |  |  |  |  |  |  | $ 169,000 |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Estimated land and construction costs |  |  |  | $ 6,000,000 |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts due from related party, noncurrent |  |  |  |  |  |  |  | $ 1,200,000 | 1,400,000
Equity investment entity | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  |  |  |  |  | 10.00% |
Revenue from related parties |  |  |  |  |  |  |  | $ 0 |
Equity investment entity | Related party loan | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount of transaction |  | $ 1,600,000 |  |  |  |  |  |  |
Number of equity method investees to whom loan was granted | item |  | 1 |  |  |  |  |  |  |
Term of loan |  |  |  |  |  |  |  | 2 years 9 months 29 days |
Number of installments | installment |  |  |  |  |  |  |  | 3 |
Equity investment entity | Raw materials purchases from related party | Accounts payable | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | $ 2,100,000 | 1,800,000
Equity investment entity | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | 0 | 146,000
Equity investment entity | Raw materials sales to related party | Accounts receivable | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts receivable from related party |  |  |  |  |  |  |  | 334,000 | 313,000
Equity investment entity | Raw materials sales to related party | Accounts receivable | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amounts receivable from related party |  |  |  |  |  |  |  | 635,000 | 156,000
Equity investment entity | Raw material agency sales agreement | Other (expense) income, net | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Other income from related party |  |  |  |  |  |  |  | 3,000 | 1,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Related party loan | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  | $ 46,000 |  |  |
Related party notes receivable - long term |  |  |  |  |  |  |  | $ 0 | 50,000
Interest rate (as a percent) |  |  |  |  |  |  |  | 6.15% |
Repayment of related party notes receivable |  |  |  |  |  |  |  | $ 55,000 |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Raw materials purchases from related party | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party notes receivable - long term |  |  |  |  |  |  |  | 0 | 107,000
Repayment of related party notes receivable |  |  |  |  |  |  |  | 114,000 |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | 0 | 210,000
Emei Shan Jiamei Materials Co., Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | 370,000 | 377,000
Xilingol Tongli Germanium Co. Ltd | Raw materials purchases from related party | Accounts payable | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | 219,000 | 246,000
Beijing Kaide Quartz Co. Ltd | Raw materials purchases from related party | Accounts payable |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  |  | 323,000
Beijing Kaide Quartz Co. Ltd | Raw materials sales to related party | Accounts payable |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  |  | $ 708,000 |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co | Lease of land | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Area of leased property (in square feet) | ft² |  |  |  |  |  |  |  | 22,081 |
Lease term |  |  |  |  |  |  |  | 10 years |
Annual lease payment |  |  |  |  |  |  |  | $ 24,000 |
Rental increase period |  |  |  |  |  |  |  | 3 years |
Interest rate (as a percent) |  |  |  |  |  |  |  | 5.00% |
Nanjing JinMei Gallium Co., Ltd | Related party loan | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Number of installments | installment |  |  |  | 3 |  |  |  |  |
Related party notes receivable - long term |  |  |  | $ 768,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.90% |  |  |  |  |
Executive officer | Related party loan | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Amount of transaction |  |  | $ 307,000 |  | $ 177,000 |  |  |  |
Interest rate (as a percent) |  |  | 2.75% |  | 2.75% |  |  |  |
Repayment of related party notes receivable |  |  |  |  |  |  | $ 180,000 |  |
Executive officer | Related party loan | Other assets | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party notes receivable - current |  |  |  |  |  |  |  | $ 307,000 |
Executive officer | Related party loan | Prepaid expenses and other current assets | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party notes receivable - current |  |  |  |  |  |  |  |  | 179,000
3rd party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Revenue from related parties |  |  |  |  |  |  |  | $ 1,200,000 | $ 653,000
Investments, consolidated | $ 2,000,000 |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) | 10.00% |  |  |  |  |  |  |  |

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