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Debt - Interim Notes (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 10, 2016
USD ($)
shares
Feb. 29, 2016
USD ($)
$ / shares
Jul. 31, 2015
USD ($)
shares
Apr. 30, 2016
USD ($)
$ / shares
Feb. 29, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt                                        
Qualified Financing threshold for debt conversion     $ 5,000,000                                  
Debt redemption price     200.00%                                  
Conversion ratio     115                                  
Interest (expense) income             $ 10,000 $ (178,000) $ (172,000) $ (144,000) $ (160,000) $ (179,000) $ (132,000) $ 13,000 $ 12,000 $ (820,000) $ (304,000) $ (654,000) $ (286,000) $ 114,000
Interim Notes                                        
Debt                                        
Proceeds from issuance of convertible notes   $ 200,000 $ 2,800,000 $ 5,000,000 $ 200,000 $ 2,700,000                            
Shares converted | shares 1,656,807   1,656,807                                  
Convertible interest rate (as a percentage)   8.00% 8.00%   8.00%                              
Qualified Financing threshold for debt conversion       5,000,000                                
Principal amount   $ 5,600,000   10,600,000 $ 5,600,000 $ 5,500,000                            
Debt issue costs       $ 10,000                                
Conversion ratio       125 115                              
Conversion price | $ / shares   $ 6.70585   $ 6.70585 $ 6.70585 $ 6.70585                            
Premium conversion derivative               $ 0       $ 0           $ 0 $ 0 $ 0
Interest (expense) income $ 200,000