Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Income tax benefits for the net operating losses	$ 0	$ 0
Federal net operating loss carryforwards	303,700,000
State net operating loss carryforwards	302,600,000
Foreign net operating loss carryforwards	$ 4,400,000
Maximum increase in percentage ownership of stockholders or public groups	50.00%
Ownership change, increase in ownership percentage, term	3 years
Unrecognized tax benefits	$ 0	0
Accrued interest or penalties related to uncertain tax positions	$ 0	$ 0
Federal corporate income tax rate	21.00%	21.00%
Domestic Country [Member]
Income Taxes [Line Items]
Federal net operating loss carryforwards, subject to expiration	$ 73,000,000
Federal net operating loss carryforwards, not subject to expiration	230,700,000
Tax credit carryforward	$ 10,200,000
Tax credit carryforward expiration period	2033
Domestic Country [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2033
Domestic Country [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2037
State And Local Jurisdiction [Member]
Income Taxes [Line Items]
Tax credit carryforward	$ 2,200,000
Tax credit carryforward expiration period	2028
State And Local Jurisdiction [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2033
State And Local Jurisdiction [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Net operating loss carryforwards expiration year	2039