Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements Rollforward (Details)

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Fair Value Measurements Rollforward (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Addition of warrant liability     $ 2,176,000  
Change in fair value $ 278,000 $ (11,000) (109,000) $ 67,000
Balance at June 30, 2018 2,886,000   2,886,000  
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Change in fair value     (109,000)  
Balance at June 30, 2018 $ 2,886,000   $ 2,886,000