Commitments and Contingencies (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2001	Sep. 30, 2019	Dec. 31, 2019	Nov. 30, 2019
Commitment Contingencies And Guarantees [Line Items]
Company outstanding guarantees			$ 3,800
Annual payments	$ 650
Deferred Compensation Arrangement with Individual, Gain (Loss)			1,700
Deferred Compensation Liability, Current and Noncurrent			$ 500
Reserved shares of common stock for possible future issuance			3,100,000
Consultant [Member]
Commitment Contingencies And Guarantees [Line Items]
Reserved shares of common stock for possible future issuance				8,000
Minimum [Member]
Commitment Contingencies And Guarantees [Line Items]
Long-term Incentive Plan, Bonus Pool Percent		1.00%
Maximum [Member]
Commitment Contingencies And Guarantees [Line Items]
Long-term Incentive Plan, Bonus Pool Percent		1.333%
Employee Severance [Member]
Commitment Contingencies And Guarantees [Line Items]
Restructuring and related cost, expected cost			$ 4,000