Quarterly report pursuant to Section 13 or 15(d)

Controlled Equity Offering (Details)

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Controlled Equity Offering (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended 11 Months Ended
Aug. 31, 2015
Jun. 30, 2016
Jun. 30, 2016
Aggregate net proceeds   $ 9,349  
Cantor | Common Stock      
Maximum value of shares available under Controlled Equity Offering $ 30,000    
Number of shares of common stock sold (in shares)   3,711,096 5,433,408
Aggregate net proceeds   $ 9,300 $ 14,900
Value of shares registered for sale     $ 14,700