Subsequent Event	9 Months Ended
Sep. 29, 2018
Subsequent Events [Abstract]
Subsequent Event	Note 14. Subsequent Event Acquisition – 4D Technology Corporation On October 26, 2018, the Company entered into a Stock Purchase Agreement with 4D Technology Corporation (“4D”) and each of the 4D stockholders pursuant to which the Company agreed to acquire all the outstanding stock of 4D in exchange for $36 million in cash and 125,117 shares of the Company’s common stock, par value $0.001 per share, valued at approximately $4 million, subject to adjustment based on the amount of cash, working capital, indebtedness, and transaction expenses of 4D (collectively, the “Purchase Price”). The closing of the transaction, which is subject to the satisfaction of customary closing conditions, is expected to occur prior to the end of the current fiscal year – December 29, 2018. The shares of the Company’s common stock are to be issued to the three principal stockholders of 4D (the “Principal Stockholders”). Pursuant to the terms of the Stock Purchase Agreement and related Escrow Agreement, $4 million in cash and 125,117 of the shares of the Company’s common stock will be withheld from the Purchase Price and placed in escrow to fund any post-closing adjustments to the purchase price and to secure the indemnification obligations of the Principal Stockholders to the Company. The Principal Stockholders have agreed to indemnify the Company for inaccuracies in the representations or the breach of the warranties or covenants made by 4D, and for certain other matters, subject to certain limitations. 4D is a supplier of high-performance interferometric measurement and inspection systems located in Tucson, Arizona. Their solutions are used primarily in the manufacture of advanced aerospace and industrial systems as well as for scientific research and semiconductor applications. 4D pioneered Dynamic Interferometry, which enables specialized applications for high-precision surface shape and profile. The addition of this business and technology will enable the Company to serve new markets in advanced process control metrology and inspection. In addition to expanding the Company’s served markets, 4D’s technology will enable next-generation systems for leading semiconductor device applications and is a natural complement to the Company’s current optical metrology and inspection solutions. Given the short period of time from entering into the Stock Purchase Agreement to the filing of this Form 10-Q, the Company is in the process of compiling the initial accounting for the 4D combination, including the determination of the fair value of tangible assets acquired and liabilities assumed, the valuation of intangibles acquired, income and non-income based taxes, residual goodwill and the amount of goodwill that will be deductible for tax purposes. Gain on Disposal of Fixed Asset – Condominium On October 31, 2018, the Company closed escrow on the sale of one of two condominiums it owns in Milpitas, California, at a sales price of $1.0 million. The Company expects to report a gain on the sale of the asset, net of certain fees and commissions, as a component of other income, during its fiscal year ended December 29, 2018 of approximately $0.9 million. As part of its facilities strategy, the Company has determined that it will no longer house traveling employees in owned condominiums and has begun divesting such assets.

Note 14. Subsequent Event

Acquisition – 4D Technology Corporation

On October 26, 2018, the Company entered into a Stock Purchase Agreement with 4D Technology Corporation (“4D”) and each of the 4D stockholders pursuant to which the Company agreed to acquire all the outstanding stock of 4D in exchange for $36 million in cash and 125,117 shares of the Company’s common stock, par value $0.001 per share, valued at approximately $4 million, subject to adjustment based on the amount of cash, working capital, indebtedness, and transaction expenses of 4D (collectively, the “Purchase Price”). The closing of the transaction, which is subject to the satisfaction of customary closing conditions, is expected to occur prior to the end of the current fiscal year – December 29, 2018.

The shares of the Company’s common stock are to be issued to the three principal stockholders of 4D (the “Principal Stockholders”). Pursuant to the terms of the Stock Purchase Agreement and related Escrow Agreement, $4 million in cash and 125,117 of the shares of the Company’s common stock will be withheld from the Purchase Price and placed in escrow to fund any post-closing adjustments to the purchase price and to secure the indemnification obligations of the Principal Stockholders to the Company. The Principal Stockholders have agreed to indemnify the Company for inaccuracies in the representations or the breach of the warranties or covenants made by 4D, and for certain other matters, subject to certain limitations.

4D is a supplier of high-performance interferometric measurement and inspection systems located in Tucson, Arizona. Their solutions are used primarily in the manufacture of advanced aerospace and industrial systems as well as for scientific research and semiconductor applications. 4D pioneered Dynamic Interferometry, which enables specialized applications for high-precision surface shape and profile. The addition of this business and technology will enable the Company to serve new markets in advanced process control metrology and inspection. In addition to expanding the Company’s served markets, 4D’s technology will enable next-generation systems for leading semiconductor device applications and is a natural complement to the Company’s current optical metrology and inspection solutions.

Given the short period of time from entering into the Stock Purchase Agreement to the filing of this Form 10-Q, the Company is in the process of compiling the initial accounting for the 4D combination, including the determination of the fair value of tangible assets acquired and liabilities assumed, the valuation of intangibles acquired, income and non-income based taxes, residual goodwill and the amount of goodwill that will be deductible for tax purposes.

Gain on Disposal of Fixed Asset – Condominium

On October 31, 2018, the Company closed escrow on the sale of one of two condominiums it owns in Milpitas, California, at a sales price of $1.0 million. The Company expects to report a gain on the sale of the asset, net of certain fees and commissions, as a component of other income, during its fiscal year ended December 29, 2018 of approximately $0.9 million. As part of its facilities strategy, the Company has determined that it will no longer house traveling employees in owned condominiums and has begun divesting such assets.