Annual report pursuant to Section 13 and 15(d)

Stockholders' deficit, Share-based compensation (Details)

v3.20.1
Stockholders' deficit, Share-based compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
6 Months Ended 12 Months Ended
May 06, 2019
May 05, 2019
Dec. 31, 2019
Stock Awards [Abstract]      
Equity awards issued (in shares)   1.3  
Equity awards issued, weighted average value per share (in dollars per share)   $ 2.47  
Share-based compensation expense as a result of immediate vesting $ 2,200    
Minimum [Member]      
Stock Awards [Abstract]      
Equity awards vesting period     2 years
Maximum [Member]      
Stock Awards [Abstract]      
Equity awards vesting period     3 years