Quarterly report pursuant to Section 13 or 15(d)

Financing - Additional Information (Details)

v3.10.0.1
Financing - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 18, 2018
USD ($)
Jul. 17, 2018
USD ($)
day
$ / shares
Mar. 22, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
Nov. 19, 2018
USD ($)
Aug. 20, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                  
Line of credit       $ 2,764,000 $ 2,764,000       $ 4,137,000
Term note       $ 6,000,000 6,000,000       $ 6,000,000
Proceeds from Convertible Note         2,500,000 $ 0      
Beneficial conversion feature on Convertible Note         328,000 0      
Advance from NovellusDx, Ltd.         $ 1,500,000 $ 0      
Convertible Debt                  
Debt Instrument [Line Items]                  
Debt instrument term   18 months              
Term note, principal balance   $ 2,625,000              
Proceeds from Convertible Note   2,500,000              
Original issue discount   100,000              
Beneficial conversion feature on Convertible Note   328,000              
Less unamortized debt issuance costs   $ 25,000              
Stated interest rate (percent)   10.00%              
Conversion price (in usd per share) | $ / shares   $ 0.80              
Number of trading days' notice | day   5              
Maximum monthly redemption   $ 650,000              
Minimum stock price per share under debt covenant (in usd per share) | $ / shares   $ 1.00              
Debt repayment premium (percent)   10.00%              
Period eligible for prepayment at 10% premium   1 year              
Increase to outstanding balance upon default (percent)   15.00%              
Interest rate upon reset due to default (percent)   22.00%              
Silicon Valley Bank | Line of Credit                  
Debt Instrument [Line Items]                  
Debt instrument term     2 years            
Line of credit, maximum borrowing capacity (not to exceed)     $ 6,000,000.0         $ 3,000,000  
Line of credit, maximum borrowing capacity, percent of accounts receivable (percent)     80.00%            
Line of credit, facility, maximum borrowing capacity, percentage of net collectable value of third party accounts receivable (percent)     50.00%            
Line of credit, facility, maximum borrowing capacity, times the average monthly collection amount of third party receivables over a previous quarter     3            
Effective interest rate (percent)       6.75% 6.75%        
Default rate (percent)       10.75% 10.75%        
Line of credit facility, unused capacity, commitment fee (percent)     0.25%            
Line of credit       $ 2,800,000 $ 2,800,000        
Silicon Valley Bank | Line of Credit | Prime Rate                  
Debt Instrument [Line Items]                  
Basis spread on variable rate (percent)     1.50%            
PFG | Secured Debt                  
Debt Instrument [Line Items]                  
Debt instrument term     3 years            
Effective interest rate (percent)     11.50%            
Default rate (percent)     17.50%            
Term note, principal balance     $ 6,000,000.0            
Debt modification costs incurred       $ 50,000 $ 258,000        
Warrants, exercise period     7 years            
Warrants, number of shares of common stock with right to purchase (in shares) | shares     443,262            
Warrants, exercise price (usd per share) | $ / shares     $ 2.82 $ 0.92 $ 0.92        
Term note       $ 6,000,000 $ 6,000,000        
NDX | Credit Agreement                  
Debt Instrument [Line Items]                  
Line of credit, maximum borrowing capacity (not to exceed) $ 2,300,000                
Stated interest rate (percent)       10.75% 10.75%        
Conversion price (in usd per share) | $ / shares       $ 0.606 $ 0.606        
Interest rate upon reset due to default (percent)       21.00% 21.00%        
Mereger agreement termination period after certain causes for termination         90 days        
Advance from NovellusDx, Ltd. 1,500,000                
Second advance $ 800,000                
Long-term line of credit       $ 1,500,000 $ 1,500,000        
Subsequent events | PFG | Secured Debt                  
Debt Instrument [Line Items]                  
Required proceeds from issuance of subordinated debt or sale of equity securities             $ 3,000,000