Basis of Presentation and Significant Accounting Policies - Summary of Deferred Revenue (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Deferred Revenue Arrangement [Line Items]
Contract liabilities	$ 5,664	$ 5,604	$ 5,604
Short-term Contract with Customer [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities	5,466		5,248
Long-term Contract with Customer [Member]
Deferred Revenue Arrangement [Line Items]
Contract liabilities	$ 198		$ 356