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Balance Sheet Components - Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Components      
Settlement accrued for reimbursement related claims   $ 1,378  
Reserves for refunds to insurance carriers $ 9,410 10,012 $ 6,795
Accrued charges for outsourced testing 8,408 5,001  
Testing and laboratory materials from suppliers 4,301 2,742  
Marketing and corporate affairs 2,957 1,306  
Legal, audit and consulting fees 2,873 1,058  
Accrued shipping charges 305 852  
Sales tax payable 1,691 1,255  
Accrued specimen service fees 2,269 1,378  
Accrued rent   903  
Clinical trials and studies 1,092 1,694  
Operating lease liabilities, current portion 5,739    
Fixed asset purchases 1,482    
Other accrued expenses 8,516 4,863  
Total other accrued liabilities $ 49,043 $ 32,442