Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.22.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Segment
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
Stockholder
$ / shares
shares
Feb. 10, 2021
$ / shares
shares
Jul. 23, 2020
shares
Oct. 31, 2019
$ / shares
Oct. 29, 2019
$ / shares
shares
Accounting Policies [Line Items]              
Restricted cash | $ $ 203 $ 312          
Depreciation expense | $ $ 400 $ 500 $ 1,000        
Number of reporting segment | Segment 1            
Convertible preferred shares issuable to number of equity stockholders | Stockholder     2        
Common stock, par value | $ / shares $ 0.001 $ 0.001          
Share price | $ / shares       $ 1.03   $ 0.5750  
Series E Preferred stock, shares outstanding 0 0          
Revenue from products and services transferred to customers, percentage 88.00% 81.00% 81.00%        
Revenue from services transferred to customers over time, percentage 12.00% 19.00% 19.00%        
Undelivered elements (product training, installation, product and support services) | $ $ 835 $ 670          
Revenue recognized from contract liability | $ 600 300          
Extended warranties recognized | $ 1,100 2,000          
Advertising costs | $ 1,400 600 $ 500        
Compensation cost related to stock options | $ 1,662 3,370 $ 2,742        
Total unrecognized compensation cost | $ $ 800 1,000          
Unrecognized share based compensation cost to be recognized over weighted-average period 1 year 6 months            
Valuation allowance | $ $ (57,679) $ (52,161)          
Outstanding stock options, restricted stock units and warrants excluded from diluted loss per share 23,200,000 61,100,000 6,900,000        
Shares issued 153,721,000 97,709,000   14,000,000      
Series F Preferred stock, par value | $ / shares $ 0.001 $ 0.001          
Forfeiture Rate One              
Accounting Policies [Line Items]              
Fair value assumptions, forfeiture rate 10.91% 10.90% 10.30%        
Forfeiture Rate Two              
Accounting Policies [Line Items]              
Fair value assumptions, forfeiture rate 25.91% 49.40% 48.70%        
Forfeiture Rate Three              
Accounting Policies [Line Items]              
Fair value assumptions, forfeiture rate 40.21%            
Forfeiture Rate Four              
Accounting Policies [Line Items]              
Fair value assumptions, forfeiture rate 49.45%            
Performance-Based Awards              
Accounting Policies [Line Items]              
Compensation cost related to stock options | $ $ 0 $ 900          
International | Maximum              
Accounting Policies [Line Items]              
Product warrant period 24 months 24 months          
Series E Convertible Preferred Stock              
Accounting Policies [Line Items]              
Convertible preferred stock, shares issued and sold 0 0 69,565        
Series E Preferred stock, par value | $ / shares     $ 0.001        
Percentage of common stock holding by shareholders     60.00%        
Convertible preferred stock, shares issued upon conversion     100       100
Temporary equity numbers of shares sold     69,565        
Conversion Of Preferred Stock Into Common Stock     6,956,500        
Temporary equity net proceeds from conversion to common stock | $     $ 4,000        
Series E Preferred stock, shares issued 0 0 69,565        
Series E Preferred stock, shares outstanding 0 0 70,000        
Series F Convertible Preferred Stock              
Accounting Policies [Line Items]              
Convertible preferred stock, shares issued upon conversion         2,500    
Series E Preferred stock, shares outstanding 251 882          
Series F Preferred stock, par value | $ / shares $ 0.001 $ 0.001          
Private Placement              
Accounting Policies [Line Items]              
Convertible preferred stock, shares issued and sold             69,565
Share price | $ / shares             $ 57.50
Series E Preferred stock, shares issued             69,565
Outstanding stock options, restricted stock units and warrants excluded from diluted loss per share 600,000 2,200,000          
Private Placement | Series E Convertible Preferred Stock              
Accounting Policies [Line Items]              
Common stock, par value | $ / shares     $ 0.001        
Share price | $ / shares     $ 57.50        
Temporary equity numbers of shares sold     69,565        
Conversion Of Preferred Stock Into Common Stock     6,956,500        
Temporary equity net proceeds from conversion to common stock | $     $ 4,000        
Private Placement | Series F Convertible Preferred Stock              
Accounting Policies [Line Items]              
Convertible preferred stock, shares issued upon conversion 251 882