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Related Party Transactions (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 02, 2017 USD ($) | Nov. 30, 2017 USD ($) | Jul. 31, 2017 USD ($) installment | Apr. 30, 2016 USD ($) | Apr. 30, 2014 USD ($) | Aug. 31, 2011 USD ($) item | Sep. 30, 2018 USD ($) ft² installment | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) ft² installment | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Area of leased property (in square feet) | ft² |  |  |  |  |  |  | 19,467 |  | 19,467 |  |
Repayment of related party notes receivable |  |  |  |  |  |  |  |  |  | $ 108,000 |
Minimum | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated land and construction costs |  |  | $ 2,000,000 |  |  |  |  |  |  |  |
Maximum | Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated land and construction costs |  |  | 4,000,000 |  |  |  |  |  |  |  |
Equity investment entity | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership (as a percent) |  |  |  |  |  |  | 10.00% |  | 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 10 months |  |
Number of installments | installment |  |  |  |  |  |  | 3 |  | 3 |  |
Equity investment entity | Related party loan | Other assets | Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amounts due from related party, noncurrent |  |  |  |  |  |  | $ 1,100,000 |  | $ 1,100,000 |  | $ 1,200,000
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 |  |  |  |  |  |  | 1,900,000 |  | 1,900,000 |  | 2,100,000
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 |  |  |  |  |  |  | 316,000 |  | 316,000 |  | $ 334,000
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 |  |  |  |  |  |  | 20,000 | $ 2,000 | 21,000 | 3,000 |
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 |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |
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 |  | 0 |  | 0
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 |  | 370,000
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 |  |  |  |  |  |  | $ 0 |  | $ 0 |  | 219,000
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 |  | 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] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  | $ 768,000 |  |  |  |  |  |  |  |
Number of installments | installment |  |  | 3 |  |  |  |  |  |  |  |
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 |  | $ 318,000 |  | $ 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 |  |  |  |  |  |  | $ 298,000 |  | $ 298,000 |  | 307,000
3rd party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Raised additional capital | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Percentage ownership from issuance of shares | 10.00% |  |  |  |  |  |  |  |  |  |
Customer associated with third-party investor | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue from related parties |  |  |  |  |  |  | 37,000 | $ 226,000 | 1,400,000 | $ 613,000 |
Customer associated with third-party investor | Accounts receivable | Beijing BoYu Semiconductor Vessel Craftwork Technology Co |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount payable to related party |  |  |  |  |  |  | $ 33,000 |  | $ 33,000 |  | $ 635,000

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