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 9 Months Ended
Oct. 31, 2017
May 31, 2017
Feb. 28, 2017
Aug. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Aggregate proceeds         $ 48,742 $ 22,217
Common stock            
Number of shares of common stock sold (in shares) 20,815,000   23,000,000   2,166,093  
Share price (in dollars per share) $ 3.35   $ 2.00      
Aggregate proceeds $ 65,300   $ 43,000   $ 5,700  
Cantor | Common stock            
Maximum value of shares available under Controlled Equity Offering   $ 40,000   $ 30,000