Quarterly report pursuant to Section 13 or 15(d)

Controlled Equity Offering (Details)

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Controlled Equity Offering (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 11 Months Ended 14 Months Ended
Sep. 30, 2016
Aug. 31, 2015
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Sep. 30, 2016
Aggregate proceeds       $ 22,217,000    
Cantor | Common stock            
Maximum value of shares available under Controlled Equity Offering $ 0 $ 30,000,000        
Number of shares of common stock sold (in shares)       7,895,563 9,617,875  
Aggregate proceeds       $ 24,300,000   $ 30,000,000
Subsequent event | Cantor | Common stock            
Aggregate proceeds     $ 1,300,000