Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2010
Stockholders' Equity
Warrants issued (in shares)				1,481,055
Exercise Price (in dollars per share)				$ 14.00
Shares of common stock issued on exercise of warrants	228,316	73,422	117,784
Warrants exercised	490,759
Warrants exercised value	$ 6.9
Number of shares issuable under the plan	1,400,000
Shares remaining to be issued	767,000