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 ($)
Feb. 28, 2015
Dec. 31, 2016
USD ($)
ft²
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 29, 2014
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          
Capital lease agreement term for information technology equipment   30 months        
Future minimum lease payments under capital lease, borrowing rate     1.60%      
Future minimum lease payments under capital lease including net minimum lease payment for year ended December 31, 2017     $ 159,000      
Accrued capital lease obligations, current position     159,000 $ 167,000    
Capital lease obligation, long-term     0 159,000    
Rent expense     1,000,000 1,000,000 $ 1,000,000  
Purchase commitments pending     18,000,000      
Litigation Settlement Amount Receivable Non-Current     825,000      
Receivable For Legal Settlements On First Anniversary     275,000      
Receivable For Legal Settlements On Second Anniversary     275,000      
Receivable For Legal Settlements On Third Anniversary     275,000      
Litigation Settlement Amount Receivable Current     550,000      
Litigation Settlement Receivable     1,400,000      
Litigation Expense Recovered       731,000    
Settlement Expense For Dismissal of Patent Infringement Lawsuit Recovered     68,000      
Legal settlement at present value     1,200,000      
Deferred revenue     $ 3,033,000 3,297,000    
Foregoing litigation settlement, description     As part of the settlement, Fotona agreed to pay the Company a total of $1.4 million, with $550,000 payable within 10 days of March 24, 2015 and the remaining, $825,000 payable in three increments of $275,000 each to be paid no later than the first, second, and third anniversary of the effective date of the agreement.      
Licensing Agreements United States            
Commitment And Contingencies [Line Items]            
License period     3 years      
Licensing Agreements Outside of United States            
Commitment And Contingencies [Line Items]            
License period     5 years      
Settled Litigation            
Commitment And Contingencies [Line Items]            
Deferred revenue           $ 379,000
Employee Arrangements and Other Compensation            
Commitment And Contingencies [Line Items]            
Change in control, if occurs, may require severance benefits payable     $ 1,300,000 1,600,000    
Accrued for performance bonuses     $ 67,000 $ 248,000