Quarterly report pursuant to Section 13 or 15(d)

Equity Offerings (Details)

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Equity Offerings (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
May 31, 2017
Feb. 28, 2017
Aug. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Aggregate proceeds       $ 46,175 $ 9,349
Common stock          
Number of shares of common stock sold (in shares)   23,000,000   1,209,027  
Share price (in dollars per share)   $ 2.00      
Aggregate proceeds   $ 43,000   $ 3,100  
Value of common stock shares registered for sale       $ 36,600  
Cantor | Common stock          
Maximum value of shares available under Controlled Equity Offering $ 40,000   $ 30,000