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Description of Business (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 10, 2018 USD ($) shares | Jul. 11, 2018 USD ($) shares | May 18, 2018 USD ($) $ / shares shares | Nov. 14, 2017 USD ($) shares | Aug. 22, 2017 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Jul. 01, 2017 USD ($) | Jun. 30, 2018 USD ($) patent shares | Jul. 01, 2017 USD ($) | Dec. 30, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Apr. 17, 2017 $ / shares
Number of issued and pending U.S. and foreign patents | patent |  |  |  |  |  |  |  | 100 |  |  |  |
Net loss |  |  |  |  |  | $ (3,417) | $ (3,847) | $ (8,090) | $ (7,189) | $ 13,400 | $ 11,200 |
Common stock shares issued | shares |  |  | 5,405,405 |  | 8,500,000 |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  | $ 0.148 |  | $ 0.60 |  |  |  |  |  |  | $ 6.56
Proceeds from issuance of common stock |  |  | $ 800 |  | $ 4,400 |  |  | $ 4,612 |  |  |  |
ATM Program |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  | 25,983,098 |  |  |  | 17,088,876 |  | 25,983,098 |  |
Proceeds from issuance of common stock |  |  |  | $ 6,600 |  |  |  | $ 3,800 |  | $ 6,600 |  |
Aggregate gross proceeds agent can sell shares of stock |  |  |  | $ 9,000 |  |  |  |  |  |  |  |
ATM Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued | shares | 8,978,094 | 8,978,094 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ 1,300 | $ 1,300 |  |  |  |  |  |  |  |  |  |

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