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Stockholders' Equity (Details) (USD $)
0 Months Ended 1 Months Ended 12 Months Ended
Feb. 10, 2014
Feb. 29, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity (Textual) [Abstract]          
Options exercised, shares     1,270,362 444,637 3,137,056
Net proceeds from stock options exercised     $ 5,079,046 $ 1,680,173 $ 4,748,612
Shares issued related to restricted stock awards, net of any shares forfeited     461,729 374,195 347,883
Common Stock, Shares Authorized     200,000,000 150,000,000  
Underwritten public offering and issued shares 8,846,153 7,820,000      
Shares sold pursuant to the full exercise of an over-allotment option granted to the underwriter 1,153,846 1,020,000      
Public Offering Price Per Share   $ 10.61      
Net proceeds from common stock issued 107,800,000 81,500,000 0 81,476,845 0
Purchase of common stock by affiliates   1,360,000      
Purchase of common stock by affiliates amount   14,400,000      
Aggregate shares issued for exercise of options         3,045,540
Stock options
         
Stockholders' Equity (Textual) [Abstract]          
Net proceeds from stock options exercised     5,500,000 2,000,000 4,700,000
Restricted Stock Units (RSUs)
         
Stockholders' Equity (Textual) [Abstract]          
Number of shares of common stock issued related to RSUs, net of RSUs surrendered as payment for withholding taxes     92,201 81,070 15,000
Number of RSUs surrendered to pay for minimum withholding taxes     61,923 46,930  
Amount of withholding taxes associated with RSUs vested during the period     $ 431,000 $ 347,000