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Summary of Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2014
Sep. 30, 2014
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
$ / shares
Sep. 30, 2014
USD ($)
$ / shares
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2015
USD ($)
Customer
Distributor
$ / shares
shares
Dec. 31, 2014
USD ($)
Customer
Distributor
$ / shares
shares
Dec. 31, 2013
USD ($)
Customer
Distributor
shares
Dec. 17, 2015
USD ($)
Aug. 31, 2015
USD ($)
May. 31, 2015
USD ($)
$ / shares
May. 14, 2015
$ / shares
Sep. 10, 2014
$ / shares
Jun. 04, 2014
$ / shares
May. 31, 2014
$ / shares
Cash and Cash Equivalents [Abstract]                                          
Cash and cash equivalents investments with original maturities     $ 14,338,000       $ 8,144,000         $ 14,338,000 $ 8,144,000                
Goodwill and Intangibles [Abstract]                                          
Other intangibles, net, Beginning balance           $ 9,415,000       $ 9,345,000   9,415,000 9,345,000                
Other intangibles, net, Acquisition of JV Intangible                         255,000                
Other intangibles, net, Increase                       13,000                  
Other intangibles, net, Amortization                       (397,000) (185,000)                
Other intangibles, net, Ending balance     9,031,000       9,415,000         9,031,000 9,415,000 $ 9,345,000              
Goodwill, net, Beginning balance           3,922,000       3,922,000   3,922,000 3,922,000                
Goodwill, net, Increase (decrease)                       0 0                
Goodwill, net Ending balance     3,922,000       3,922,000         3,922,000 3,922,000 3,922,000              
Total goodwill and other intangibles, net     12,953,000       13,337,000         $ 12,953,000 13,337,000                
Useful life (in years)                       7 years                  
Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Amortization Expense, Fiscal Year Maturity [Abstract]                                          
2016     782,000                 $ 782,000                  
2017     1,539,000                 1,539,000                  
2018     2,415,000                 2,415,000                  
Thereafter     3,864,000                 3,864,000                  
Class of Warrant or Right [Line Items]                                          
Warrant liability     $ 0       $ 9,793,000         $ 0 $ 9,793,000                
Exercise price per shares (in dollars per share) | $ / shares   $ 2.00 $ 0.75       $ 0.69 $ 2.00       $ 0.75 $ 0.69         $ 3.50 $ 1.00 $ 3.00 $ 2.62
Common stock issued, value                       $ 10,701,000 $ 18,590,000 17,816,000              
Period exercisable from the date of issuance 6 years 6 years                                      
Revenue Recognition [Abstract]                                          
Period of services provided subsequent to date of sale                       1 year                  
Concentration Risk [Line Items]                                          
Revenues     $ 1,556,000 $ 766,000 $ 1,614,000 $ 902,000 $ 2,469,000 $ 518,000 $ 935,000 $ 1,031,000   $ 4,838,000 $ 4,953,000 $ 7,122,000              
Concentration risk percentage                       100.00% 100.00% 100.00%              
Research and Development Arrangements [Line Items]                                          
Costs associated with the development device                       $ 19,000,000 $ 15,105,000 $ 17,065,000              
Maximum total cost-plus fixed fee     12,100,000                 12,100,000                  
Qualifying expenditures related to research                       6,345,000 $ 2,461,000 $ 3,053,000              
Qualified expenses entitlement under BARDA contract                       14,100,000                  
Qualified expenses related to research                       8,300,000                  
Total expense and expenditure on Initial option                       $ 22,400,000                  
Loss Per Share [Abstract]                                          
Dilutive common shares excluded from the calculations of diluted loss per share (in shares) | shares                       12,300,000 43,700,000 17,200,000              
America [Member]                                          
Concentration Risk [Line Items]                                          
Revenues                       $ 982,000 $ 1,224,000 $ 1,152,000              
Concentration risk percentage                       20.00% 25.00% 16.00%              
Japan [Member]                                          
Concentration Risk [Line Items]                                          
Revenues                       $ 2,394,000 $ 3,068,000 $ 1,450,000              
Concentration risk percentage                       50.00% 62.00% 21.00%              
Europe [Member]                                          
Concentration Risk [Line Items]                                          
Revenues                       $ 675,000 $ 649,000 $ 1,948,000              
Concentration risk percentage                       14.00% 13.00% 27.00%              
Asia Pacific [Member]                                          
Concentration Risk [Line Items]                                          
Revenues                       $ 787,000 $ 12,000 $ 2,572,000              
Concentration risk percentage                       16.00% 0.00% 36.00%              
BARDA Contract [Member]                                          
Research and Development Arrangements [Line Items]                                          
Costs associated with the development device                     $ 106,000,000                    
Research and development arrangement with federal government, customer funding to offset costs incurred                       $ 4,700,000                  
Research and development arrangement, initial base period                       2 years                  
Minimum [Member]                                          
Property, Plant and Equipment [Line Items]                                          
Useful lives of the assets                       3 years                  
Maximum [Member]                                          
Property, Plant and Equipment [Line Items]                                          
Useful lives of the assets                       5 years                  
Letter of Credit [Member]                                          
Line of Credit Facility [Line Items]                                          
Letter of credit amount required by lease agreement     350,000                 $ 350,000                  
Restricted cash required to maintained under Lease agreement     350,000                 $ 350,000                  
Customer Concentration Risk [Member] | Revenue Recognized [Member]                                          
Concentration Risk [Line Items]                                          
Number of customers | Customer                       4 1                
Number of distributor                       1 3 1              
Concentration risk percentage                       63.00% 52.00% 26.00%              
Customer Concentration Risk [Member] | Accounts Receivable [Member]                                          
Concentration Risk [Line Items]                                          
Number of customers | Customer                       2   1              
Number of distributor | Distributor                         3 2              
Concentration risk percentage                       73.00% 92.00% 55.00%              
Warrant [Member]                                          
Class of Warrant or Right [Line Items]                                          
Warrant liability     $ 10,000,000                 $ 10,000,000                  
October 2014 warrants [Member]                                          
Class of Warrant or Right [Line Items]                                          
Warrant liability             $ 9,800,000           $ 9,800,000                
Exercise price per shares (in dollars per share) | $ / shares     $ 0.5771                 $ 0.5771                  
Period exercisable from the date of issuance                       6 months 1 day                  
Expiration term of warrant                       5 years                  
Expected term                         5 years 3 months 18 days                
Common stock market price (in dollars per share) | $ / shares             $ 0.49           $ 0.49                
Risk free interest rate                         1.65%                
Expected volatility                         90.00%                
Resulting fair value (per warrant) (in dollars per share) | $ / shares             $ 0.38           $ 0.38                
May 2015 Warrants [Member]                                          
Class of Warrant or Right [Line Items]                                          
Warrant liability                             $ 5,000,000   $ 14,300,000        
Exercise price per shares (in dollars per share) | $ / shares     $ 1.02                 $ 1.02                  
Common stock issued, value                       $ 25,000,000                  
Number of common stock within each unit (in shares) | shares                       1                  
Number of warrants within each unit (in shares) | shares                       1                  
Number of warrants to purchase common stock (in shares) | shares     1                 1                  
Period exercisable from the date of issuance                       6 months 1 day                  
Expiration term of warrant                       5 years                  
August 2015 Warrants [Member]                                          
Class of Warrant or Right [Line Items]                                          
Warrant liability                             1,500,000 $ 1,600,000          
Exercise price per shares (in dollars per share) | $ / shares     $ 0.401                 $ 0.401                  
Expiration term of warrant                       5 years                  
October 2015 warrants [Member]                                          
Class of Warrant or Right [Line Items]                                          
Warrant liability                             $ 3,300,000            
Exercise price per shares (in dollars per share) | $ / shares                                 $ 0.3263