XML 58 R47.htm IDEA: XBRL DOCUMENT v3.19.2
Fair Value Measurement - Fair Value Measurements Change in Level 3 Inputs (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value Disclosures [Abstract]        
Proceeds investment agreement     $ 9,142,000  
Repayment of obligation     (6,000,000)  
Change in fair value $ (2,961,000) (3,098,000)
Proceeds investment agreement $ 6,240,000   $ 6,240,000