Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.10.0.1
Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Segment
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Accounting Policies [Line Items]        
Restricted cash $ 312,000 $ 312,000 $ 251,000  
Depreciation expense   900,000 1,200,000 $ 1,000,000
Losses on impairment of internally developed software   $ 1,200,000 $ 500,000  
Number of reporting segment | Segment   1    
Revenue from products and services transferred to customers, percentage   86.00% 85.00% 86.00%
Revenue from services transferred to customers over time, percentage   14.00% 15.00% 14.00%
Undelivered elements (product training, installation, product and support services) 730,000 $ 730,000 $ 980,000  
Revenue recognized from contract liability   800,000    
Extended warranties recognized   800,000    
Deferred royalties recognized   11,000    
Advertising costs   600,000 300,000 $ 400,000
Compensation cost related to stock options   2,768,000 2,207,000 $ 3,065,000
Total unrecognized compensation cost 2,800,000 $ 2,800,000 $ 3,400,000  
Unrecognized share based compensation cost to be recognized over weighted-average period   2 years    
Outstanding stock options, restricted stock units and warrants excluded from diluted loss per share | shares   5,862,000 3,384,000 4,107,000
Adjustments to additional paid in capital warrant issued   $ 847,000    
ASU 2017-11        
Accounting Policies [Line Items]        
Adjustments to additional paid in capital warrant issued 800,000      
Cumulative effect adjustment to retained earnings 0      
Executives        
Accounting Policies [Line Items]        
Fair value assumptions, forfeiture rate   7.28%    
Employees        
Accounting Policies [Line Items]        
Fair value assumptions, forfeiture rate   45.31%    
Performance-Based Awards        
Accounting Policies [Line Items]        
Compensation cost related to stock options   $ 100,000    
Maximum        
Accounting Policies [Line Items]        
Operating liabilities 1,000,000 1,000,000    
Minimum        
Accounting Policies [Line Items]        
Operating liabilities 800,000 $ 800,000    
U S | Maximum        
Accounting Policies [Line Items]        
Product warrant period   2 years 2 years  
U S | Waterlase Systems        
Accounting Policies [Line Items]        
Product warrant period     1 year  
International | Maximum        
Accounting Policies [Line Items]        
Product warrant period   28 months 28 months  
Corporate Credit Cards        
Accounting Policies [Line Items]        
Restricted cash 200,000 $ 200,000    
Western Alliance | Commercial Credit Card        
Accounting Policies [Line Items]        
Restricted cash $ 100,000 $ 100,000