Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Unrecognized Tax Benefits Summary [Line Items]
Valuation allowance	$ 23,600,000
Tax credit carryforward, amount	17,700,000
Unrecognized tax benefits that would favorably impact effective tax rate	4,500,000
Unrecognized tax benefits, income tax penalties and interest accrued	4,700,000	$ 3,900,000
Decrease in unrecognized tax benefits in next twelve months	0
U.S. Federal, and Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating Loss Carryforwards	22,300,000
U.S. State [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating Loss Carryforwards	$ 11,500,000
Earliest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2021
State tax credit carryforwards, expiration year	2021
Open tax year	2014
Earliest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2015
Earliest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2017
Latest Tax Year [Member]
Unrecognized Tax Benefits Summary [Line Items]
Operating loss carryforwards, expiration year	2041
State tax credit carryforwards, expiration year	2027
Open tax year	2019
Latest Tax Year [Member] | U.S. [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2018
Latest Tax Year [Member] | Germany [Member]
Unrecognized Tax Benefits Summary [Line Items]
Ongoing tax audits period	2018