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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 20, 2017
USD ($)
$ / shares
shares
Jun. 15, 2017
$ / shares
shares
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Mar. 31, 2016
shares
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Feb. 28, 2017
USD ($)
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 | $         $ 6,231 $ 4,502      
Holders may elect to receive net proceeds from financing activities, percentage         25.00%        
Common Stock, par value | $ / shares     $ 0.001   $ 0.001     $ 0.001  
Repayment of notes payable | $         $ 4,500        
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
Warrants outstanding     0   0     0 5,500,000
Number of equity compensation plans | item     3   3        
Maximum [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Additional shares authorized, underwriting agreement   2,312,903              
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   1,841,595        
At the Market Offering [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares issued     3,200,000   3,200,000        
Average common stock price per share | $ / shares     $ 3.86   $ 3.86        
Proceeds from issuance of common stock from equity plans | $     $ 11,900   $ 11,900        
Common stock offering price shares | $             $ 60,000    
Commissions         3.00%        
Underwritten Public Equity Offering [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Shares issued 17,732,257                
Proceeds from issuance of common stock from equity plans | $ $ 52,700                
Commissions 4.00%                
Shares authorized, underwriting agreement   15,419,354              
Option to purchase additional shares, period   30 days              
Common Stock, par value | $ / shares   $ 0.001              
Price per share | $ / shares $ 3.10 $ 3.10              
Other accrued offering expenses | $     $ 200   $ 200