Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Assets and Liabilities - Additional Information (Details)

v3.19.2
Fair Value of Financial Assets and Liabilities - Additional Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Discounted cash flow include a discount rate 15.00% 15.00%
Fair value, assets Level 1 to Level 2 transfers, amount $ 0  
Fair value, liabilities Level 1 to Level 2 transfers, amount 0  
Fair value, assets Level 2 to Level 1 transfers, amount 0  
Fair value, liabilities Level 2 to Level 1 transfers, amount 0  
Fair value, asset Level 3 transfers amount 0  
Fair value, liabilities Level 3 transfers amount $ 0