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Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Issuance of common stock for cash, financing costs $ 4,000 $ 5,500 $ 585
Issuance of Common Stock and Warrants for Cash, Financing Costs     $ 783