Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

v3.20.2
Income Taxes (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]            
Effective income tax rates (0.20%) 1.80% 1.30% 2.70%    
Unrecognized tax benefits $ 0   $ 0   $ 0  
Income tax benefit from tax holiday $ 400,000       $ 1,300,000 $ 1,300,000