Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 9,163	$ 3,542	$ 16,087	$ 7,496
Cost of revenue [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	258	269	563	602
Cost of revenue [Member] | Provider [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	221	220	538	496
Cost of revenue [Member] | Payer & Life Sciences
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	37	49	25	106
Selling, General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	8,309	2,335	13,798	4,888
Research and development [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense	$ 596	$ 938	$ 1,726	$ 2,006