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Balance Sheet Components - Components of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Payables And Accruals [Abstract] |  |
Clinical studies | $ 1,375 | $ 756
Accrued interest payable on debt | 862 | 0
Professional fees | 620 | 880
Debt financing fees | 600 | 0
Test sample processing fees | 524 | 426
Accrued overpayments and refunds | 281 | 163
Software implementation costs | 176 | 0
Deferred rent – current portion | 374 | 258
Capital leases – current portion | 68 | 71
Other accrued expenses | 440 | 338
Total accrued and other liabilities | $ 5,320 | $ 2,892

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