Quarterly report pursuant to Section 13 or 15(d)

Controlled Equity Offering (Details)

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Controlled Equity Offering (Details) - Cantor - Common Stock - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 8 Months Ended
Aug. 31, 2015
Mar. 31, 2016
Mar. 31, 2016
Maximum value of shares available under Controlled Equity Offering $ 30.0    
Number of shares of common stock sold (in shares)   0 1,722,312
Aggregate net proceeds     $ 5.5
Value of shares registered for sale     $ 24.3