Summary of Significant Accounting Policies - Summary of Revenue from Contracts with Customers by Payor Type (Detail) - Accounting Standards Update 2014-09 - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
---|---|---|
Sep. 30, 2018 |
Sep. 30, 2018 |
|
Disaggregation Of Revenue [Line Items] | ||
Revenue from contracts with customers by payor type | $ 5,625 | $ 15,678 |
Genetic Testing Services | Institutional | ||
Disaggregation Of Revenue [Line Items] | ||
Revenue from contracts with customers by payor type | 5,334 | 14,594 |
Genetic Testing Services | Patient | ||
Disaggregation Of Revenue [Line Items] | ||
Revenue from contracts with customers by payor type | 148 | 407 |
Genetic Testing Services | Insurance | ||
Disaggregation Of Revenue [Line Items] | ||
Revenue from contracts with customers by payor type | $ 143 | $ 677 |