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Statement of Stockholders' Equity [Parenthetical] - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Stock issued in registered direct offering price per share   $ 8.00
Stock issued during the period underwritten offering per share $ 5.85  
Common stock for services per share issue 5.97 10.26
Common stock for services per share issue one 3.96  
Stock issued during period par value exercise of options 2.20 2.20
Stock issued during period par value exercise of options one 4.88 $ 4.88
Stock issued during period par value exercise of options two $ 5.21