Summary of Significant Accounting Policies - Summary of Details of Adjustment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other long term assets	$ 2,584		$ 203
Liabilities and Stockholders’ Equity
Accrued expenses	8,094		9,619
Other long term liabilities	$ 1,590		$ 0
ASC 842
Assets
Other long term assets		$ 1,751
Liabilities and Stockholders’ Equity
Accrued expenses		507
Other long term liabilities		1,244
ASC 842 | Restatement Adjustment
Assets
Other long term assets		1,751
Liabilities and Stockholders’ Equity
Accrued expenses		507
Other long term liabilities		$ 1,244