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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