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Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2019
Segment Reporting [Abstract]  
Summary of Segment Revenues, Gross Profit, Segment Operating Income or Loss and Reconciliation of Segment Operating Income or Loss to GAAP Loss
Segment revenues, gross profit, segment operating income or loss, and a reconciliation of segment operating income or loss to
US 
GAAP loss before income tax is as follows (in thousands):
 
   Three
 
Months
 
Ended
September 30,
   Nine Months Ended
September 30,
 
   2019   2018   2019   2018 
Segment revenues:
                    
Detection
  $6,087   $3,927   $15,464   $11,928 
Therapy
   1,770    2,265    6,495    6,739 
   
 
 
   
 
 
   
 
 
   
 
 
 
Total Revenue
  $7,857   $6,192   $21,959   $18,667 
   
 
 
   
 
 
   
 
 
   
 
 
 
Segment gross profit:
                    
Detection
  $5,051   $3,454   $12,874   $10,439 
Therapy
   1,003    1,284    4,188    3,581 
   
 
 
   
 
 
   
 
 
   
 
 
 
Segment gross profit
  $6,054   $4,738   $17,062   $14,020 
   
 
 
   
 
 
   
 
 
   
 
 
 
Segment operating income (loss):
                    
Detection
  $943   $978   $1,918   $1,984 
Therapy
   (1,022   (435   (1,065   (1,861
   
 
 
   
 
 
   
 
 
   
 
 
 
Segment operating income (loss)
  $(79  $543   $853   $123 
   
 
 
   
 
 
   
 
 
   
 
 
 
General, administrative, depreciation and amortization expense
  $(1,881)  $(1,792  $(5,305)  $(5,459
Interest expense
   (193   (118   (604   (373
Other income
   103    28    226    79 
Fair value of convertible debentures
   (900   —      (5,340   —   
   
 
 
   
 
 
   
 
 
   
 
 
 
Loss before income tax
  $(2,950  $(1,339  $(10,170  $(5,630