Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Details)

v3.10.0.1
Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
May 18, 2018
May 17, 2018
Aggregate proceeds   $ 67,162 $ 46,175    
Common stock          
Authorized number of shares of common stock       400,000,000 200,000,000
Number of shares of common stock sold (in shares) 18,400,000        
Share price (in dollars per share) $ 3.90 $ 3.90      
Aggregate proceeds $ 67,200