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Related Party Transactions (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) installment | Apr. 30, 2016 USD ($) | Apr. 30, 2014 USD ($) | Aug. 31, 2011 USD ($) item | Sep. 30, 2017 USD ($) ft² installment | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² installment | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Related party notes receivable - long term |  |  |  |  |  |  |  |  |  | $ 157,000
Additional revenue |  |  |  |  | $ 28,168,000 |  | $ 21,872,000 | $ 72,341,000 | $ 61,080,000 |
Area of leased property (in square feet) | ft² |  |  |  |  | 19,467 |  |  | 19,467 |  |
Repayment of related party notes receivable |  |  |  |  |  |  |  | $ 108,000 |  |
Related party notes receivable - current |  |  |  |  | $ 57,000 |  |  | 57,000 |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Estimated land and construction costs | $ 6,000,000 |  |  |  |  |  |  |  |  |
Equity investment entity | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Additional revenue |  |  |  |  |  |  |  | $ 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 10 months |  |
Number of installments | installment |  |  |  |  | 3 |  |  | 3 |  |
Equity investment entity | Related party loan | Other Assets [Member] | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |
Related party notes receivable - long term |  |  |  |  | $ 1,200,000 |  |  | $ 1,200,000 |  | 1,400,000
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 |  |  |  |  | 1,800,000 |  |  | 1,800,000 |  | 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 |  |  | 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 |  |  |  |  | 326,000 |  |  | 326,000 |  | 313,000
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 |  |  |  |  | 2,000 |  | $ 0 | 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 |  |  | $ 44,000 |  |  |  |  |  |  |
Related party notes receivable - long term |  |  |  |  | 0 |  |  | $ 0 |  | 50,000
Interest rate (as a percent) |  |  |  |  |  |  |  | 6.15% |  |
Repayment of related party notes receivable |  |  |  |  |  | $ 53,000 |  |  |  |
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 |  |  |  |  | 57,000 |  |  | $ 57,000 |  | 107,000
Repayment of related party notes receivable |  |  |  |  | 55,000 |  |  |  |  |
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 |  |  | 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 |  |  |  |  | 0 |  |  | 0 |  | 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 |  |  |  |  | 433,000,000,000 |  |  | 433,000,000,000 |  | 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 |  |  |  |  | $ 579,000 |  |  | $ 579,000 |  | 323,000
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 |  |  | 22,081 |  |
Lease term |  |  |  |  |  |  |  | 10 years |  |
Annual lease payment |  |  |  |  |  |  |  | $ 24,000 |  |
Increase in annual lease payment at each third year anniversary (in hundredths) |  |  |  |  | 5.00% |  |  | 5.00% |  |
Rental increase period |  |  |  |  |  |  |  | 3 years |  |
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 | $ 751,000 |  |  |  |  |  |  |  |  |
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 |  | $ 177,000 |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.75% |  |  |  |  |  |  |  |
Repayment of related party notes receivable |  |  |  |  |  | $ 180,000 |  |  |  |
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 |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 179,000

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