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Business combinations - ArcherDX (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2020
Sep. 30, 2020
Apr. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]            
Cash transferred     $ 25,434,000      
Proceeds from issuance of common stock         $ 9,076,000 $ 5,734,000
Common stock:            
Business Acquisition [Line Items]            
Common stock issued       $ 1,000 $ 3,000 $ 2,000
Private placement | Common stock: | ArcherDX            
Business Acquisition [Line Items]            
Proceeds from issuance of common stock   $ 5,000,000.0        
Subsequent event | ArcherDX            
Business Acquisition [Line Items]            
Business acquisition common stock issued (in shares) 30.0          
Cash transferred $ 325,000,000.0          
Subsequent event | Milestone achievement agreement | ArcherDX            
Business Acquisition [Line Items]            
Business acquisition common stock issued (in shares) 27.0          
Subsequent event | Debt financing contingency | ArcherDX            
Business Acquisition [Line Items]            
Warrants issued (in shares) 1.0          
Exercise price (in dollars per share) $ 16.85          
Subsequent event | Private placement | Common stock: | ArcherDX            
Business Acquisition [Line Items]            
Common stock issued $ 275,000,000.0          
Shares issued price per share (in dollars per share) $ 16.85          
Secured Debt | Subsequent event | 2020 Term Loan | ArcherDX            
Business Acquisition [Line Items]            
Aggregate principal amount $ 135,000,000.0          
Stated interest rate 2.00%          
LIBOR | Secured Debt | Subsequent event | 2020 Term Loan | ArcherDX            
Business Acquisition [Line Items]            
Floor rate 2.00%          
Basis spread on variable rate 8.75%