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Balance Sheet Components - Other Accured Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Balance Sheet Components    
Overpayments from insurance carriers $ 7,535 $ 3,306
Other accrued expenses 4,521 4,344
Testing and laboratory materials from suppliers 3,804 7,736
Marketing and corporate affairs 202 1,118
Leasehold improvement projects in progress 1,659  
Accrued specimen service fees 469 454
Accrued shipping charges 467 401
Sales tax payable 459 346
Clinical trials and studies 388 90
Accrued rent 195 450
Legal, audit and consulting fees 180 421
Deferred lease obligation   42
Total other accrued liabilities $ 19,879 $ 18,708