Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes Disclosure [Line Items]
Deferred tax assets, valuation allowance		$ 143,379,000	$ 72,380,000
Tax reform deferred rate change	$ 28,163,000
Foreign investments benefit			0
Net operating loss carryforwards		103,454,000	$ 88,341,000
Net operating losses carry forwards, expiration year				2037	2036
Uncertain tax positions		$ 0
Operating loss carryforwards, limitations on Use		The federal NOLs generated in 2018 and 2019 will be carried forward until they are utilized as they do not expire per the Tax Cuts and Jobs Act, but are subject to a limitation of 80% of taxable income.
Tax Years 2012 Through 2014
Income Taxes Disclosure [Line Items]
Income tax refund claimed		$ 3,095,000