Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
1 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Dec. 31, 2018
USD ($)
ft²
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitment And Contingencies [Line Items]        
Area of corporate headquarters and manufacturing facility | ft²   57,000    
Extended lease term Apr. 30, 2020      
Provisions for tenant improvement allowance, maximum $ 398,000      
Rent expense   $ 800,000 $ 1,000,000 $ 1,000,000
Purchase commitments pending   8,700,000    
Contingent loss related to litigation settlement   1,500,000    
Employee Arrangements and Other Compensation        
Commitment And Contingencies [Line Items]        
Change in control, if occurs, may require severance benefits payable   3,000,000 1,700,000  
Accrued for performance bonuses   $ 300,000 $ 100,000