Fair Value Measurements - Assets Carried at Fair Value and Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Total assets	$ 5,023	$ 5,012
Liabilities:
Total liabilities	1,137
Short-Term Investments [Member]
Assets:
Total assets	5,023	5,012
Contingent Consideration - Current [Member]
Liabilities:
Total liabilities	711
Contingent Consideration - Non-current [Member]
Liabilities:
Total liabilities	426
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	5,023	5,012
Significant Other Observable Inputs (Level 2) [Member] | Short-Term Investments [Member]
Assets:
Total assets	5,023	$ 5,012
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Total liabilities	1,137
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration - Current [Member]
Liabilities:
Total liabilities	711
Significant Unobservable Inputs (Level 3) [Member] | Contingent Consideration - Non-current [Member]
Liabilities:
Total liabilities	$ 426