Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) ft²	Mar. 31, 2018 USD ($)
Product Warranty [Abstract]
Period of warranty	12 months
Change in warranty accrual [Roll Forward]
Beginning accrued product warranty	$ 236	$ 133
Accruals for warranties issued	127	59
Adjustments related to pre-existing warranties including expirations and changes in estimates	93	(46)
Cost of warranty repair	(131)	(29)
Ending accrued product warranty	$ 325	$ 117
Leases
Area of property under long-term operating lease (in square feet) \| ft²	19,467
Term of royalty agreement	8 years
Dingxing
Leases
Total investment agreement value	$ 90,000
Kazuo
Leases
Total investment agreement value	15,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| Kazuo
Leases
Total investment agreement value	$ 8,000

Represents period of warranty provided by the entity in connection with sale of its products against material defects.

No definition available.

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- Definition

Represents period of royalty agreement as stipulated in the terms of the contract.

+ References

No definition available.

+ Details

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- Definition

Total estimated investment value to related party including assets and capital.

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(4))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- Definition

Amount of increase in the standard and extended product warranty accrual from warranties issued.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- Definition

Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- References

No definition available.

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