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Organization and Description of Business - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 09, 2018
Jul. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
financial_institution
$ / shares
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
financial_institution
segment
product
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Cash and Cash Equivalents [Line Items]                  
Number of operating segments | segment             1    
Number of products | product             3    
Number of shares issued and sold (in shares) | shares   5,750,000              
Price per share (in usd per share) | $ / shares   $ 10.25              
Proceeds from the issuance of common stock in a public offering, net of costs   $ 55,000,000         $ 55,039,000 $ 200,000  
Stock issuance costs   $ 3,900,000              
Number of major financial institutions with which the company's cash and cash equivalents are deposited | financial_institution       1     1    
Long term deposit consisting of letter of credit serving as security for lease       $ 603,000     $ 603,000   $ 603,000
Revenue recognized received in cash       0   $ 262,000 0 2,400,000  
Revenue       23,466,000   17,519,000 66,258,000 52,357,000  
Loss from operations       $ (4,304,000)   $ (6,368,000) $ (19,176,000) $ (20,494,000)  
Net income (loss) per common share, basic and diluted (in usd per share) | $ / shares       $ (0.12)   $ (0.21) $ (0.56) $ (0.67)  
Litigation settlement, amount awarded from other party     $ 400,000            
Accrued Income Receivable                  
Cash and Cash Equivalents [Line Items]                  
Revenue       $ 500,000     $ 1,700,000    
Loss from operations       $ 500,000     $ 1,700,000    
Net income (loss) per common share, basic and diluted (in usd per share) | $ / shares       $ (0.01)     $ (0.05)    
Headquarters and laboratory facilities, South San Francisco, lease signed April 2015                  
Cash and Cash Equivalents [Line Items]                  
Long term deposit consisting of letter of credit serving as security for lease       $ 603,000     $ 603,000   $ 603,000
Tissue Samples                  
Cash and Cash Equivalents [Line Items]                  
Contract with customer, revenue recognized       0 $ 450,000   450,000    
Contract agreement term 1 year                
Automatic renewal period of contract agreement 1 year                
Other Services                  
Cash and Cash Equivalents [Line Items]                  
Contract with customer, revenue recognized       250,000     250,000    
Revenue, remaining performance obligation         $ 500,000        
Performance obligation, amount to be recognized per quarter       $ 250,000     $ 250,000    
Over-Allotment Option                  
Cash and Cash Equivalents [Line Items]                  
Number of shares issued and sold (in shares) | shares   750,000