Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Cash equivalents	$ 19,036	$ 19,976
Total cash equivalents	19,036	19,976
Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	19,036	19,976
Total cash equivalents	19,036	19,976
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents	0	0
Total cash equivalents	0	0
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash equivalents	0	0
Total cash equivalents	$ 0	$ 0