Summary of Significant Accounting Policies - Schedule of Balance Sheet Prior Period Adjustment to the Adoption of Topic 606 (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs	$ 400	$ 400
Contract liability	$ 8,086	11,510
Accounting Standards Update (ASU) 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs		400
Long-term contract costs		1,268
Total Assets		1,668
Contract liability		3,725
Long-term contract liability		11,510
Total Liabilities		15,235
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Accounting Standards Update (ASU) 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs		400
Long-term contract costs		1,268
Total Assets		1,668
Contract liability		3,725
Long-term contract liability		11,510
Total Liabilities		$ 15,235	$ 9,725