Supplemental Balance Sheet Information - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
|
Supplemental Balance Sheet Information [Line Items] | |||||
Property and equipment, gross | $ 22,329 | $ 22,329 | $ 20,655 | ||
T2 Owned Instruments in Service [Member] | |||||
Supplemental Balance Sheet Information [Line Items] | |||||
Property and equipment, gross | 7,900 | $ 7,900 | $ 5,700 | ||
Estimated useful lives (in years) | 5 years | ||||
Depreciation expense recorded as a component of cost of product revenue | $ 200 | $ 200 | $ 700 | $ 400 |