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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
USD ($)
item
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
Dec. 31, 2016
$ / shares
shares
Feb. 28, 2013
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued   3,000,000      
Proceeds from issuance of common stock from equity plans | $ $ 3,408 $ 3,423      
Holders may elect to receive net proceeds from financing activities, percentage 25.00%        
Number of shares of common stock called by issuance of warrants   3,818,000   4,200,000 5,500,000
Aggregate exercise price of common stock called by issuance of warrants | $ / shares       $ 2.63 $ 2.63
Warrants outstanding 0     5,500,000  
Number of equity compensation plans | item 3        
Stock Options [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued 750,005 668,566      
Common stock reserved for issuance 1,841,595        
At the Market Offering [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares issued   3,100,000      
Average common stock price per share | $ / shares   $ 8.80      
Proceeds from issuance of common stock from equity plans | $   $ 26,500      
Common stock offering price shares | $     $ 60,000    
Commissions 3.00%