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Stockholders' Equity (Warrants Outstanding to Purchase Common Stock) (Details)
shares in Thousands
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Class of Warrant or Right [Line Items]  
Common shares issuable upon exercise of outstanding warrants 1,700
Inverstor warrants one  
Class of Warrant or Right [Line Items]  
Common shares issuable upon exercise of outstanding warrants 1,333
Exercise price in USD Dollars | $ / shares $ 1.50
Expiration Date Nov. 22, 2018
Investor warrants two  
Class of Warrant or Right [Line Items]  
Common shares issuable upon exercise of outstanding warrants 366
Exercise price in USD Dollars | $ / shares $ 3.60
Expiration Date Dec. 03, 2016
Inverstor warrants three  
Class of Warrant or Right [Line Items]  
Common shares issuable upon exercise of outstanding warrants 1
Exercise price in USD Dollars | $ / shares $ 3.00
Expiration Date Feb. 02, 2019