Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.3.1.900
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
Segment
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Accounting Policies [Line Items]      
Restricted cash $ 200,000 $ 0  
Depreciation expense 817,000 $ 627,000 $ 484,000
Number of operating segments | Segment   1  
Undelivered elements (training, installation, product and support services) 1,608,000 $ 952,000  
Provision for sales returns 210,000 110,000  
Extended warranty contracts 1,400,000 1,500,000  
Revenue recognition, percentage of fair value of trade-in exchange     25.00%
Advertising costs 929,000 543,000 $ 1,500,000
Compensation cost related to stock options $ 3,350,000 $ 1,233,000 $ 1,609,000
Net impact of share based compensation expense to earnings per diluted share | $ / shares $ (0.06) $ (0.03) $ (0.05)
Total unrecognized compensation cost $ 4,400,000 $ 1,400,000  
Unrecognized share based compensation cost to be recognized over weighted-average period 2 years 10 months 24 days    
Outstanding stock options and warrants excluded from diluted loss per share | shares 14,587,000 13,606,000 6,039,000
Executives      
Accounting Policies [Line Items]      
Fair value assumptions, forfeiture rate 5.28%    
Employees      
Accounting Policies [Line Items]      
Fair value assumptions, forfeiture rate 33.85%    
U S      
Accounting Policies [Line Items]      
Product warrant period 2 years 2 years 2 years
International      
Accounting Policies [Line Items]      
Product warrant period 28 months 28 months 16 months