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Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 23, 2016 | Apr. 01, 2017 | Dec. 31, 2016 | Jul. 01, 2017
Serial Preferred Stock |  |  |  |
Preferred Stock, Shares Authorized |  | 10,000,000 | 10,000,000 |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.001 | $ 0.001 |
Preferred Stock, Shares Outstanding |  | 0 | 0 |
Common Stock |  |  |  |
Common stock shares issued | 9,200,000 |  |  |
Common stock issued, price per share | $ 1.25 |  |  |
Proceeds from issuance of common stock | $ 10.3 |  |  |
Stock-Based Compensation |  |  |  |
Shares authorized for issuance |  | 10,205,566 |  |
Automatic annual increase in shares authorized as percentage of common stock outstanding |  | 2.50% | 5.00% |
Automatic annual increase in shares authorized, subject to adjustment for corporate actions |  | 1,200,000 | 1,200,000 |
Shares available for issuance |  | 743,700 |  |
Rate of vesting of options granted |  | 25.00% |  |
Vesting period of options granted, in years |  | 4 years |  |
Expiration of vested options, period from date of grant |  | 10 years |  |
Subsequent Event |  |  |  |
Stock-Based Compensation |  |  |  |
Shares authorized for issuance |  |  |  | 1,000,000

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