Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
Customer
Segment
Dec. 31, 2018
USD ($)
Customer
Dec. 31, 2017
USD ($)
Customer
Jan. 01, 2019
USD ($)
Significant Accounting Policies [Line Items]        
Standard warranty period offered 3 years      
Cash payments received in advance of satisfying performance obligations $ 8,757,000 $ 6,909,000    
Performance obligation partially offset of revenue recognized 5,903,000 2,855,000    
Deferred capped rental revenue $ 0 0    
Rental revenue earned 30 days      
Accounts receivable, net $ 34,325,000 37,041,000    
Unbilled Receivables 590,000 589,000    
Increase in provision for bad debt and revenue adjustments related to prior years $ 611,000 $ 1,757,000    
Percentage of Non-US revenue invoiced in Euros 70.20% 74.80%    
Transfer of inventory to rental equipment $ 1,043,000 $ 1,187,000 $ 1,055,000  
Salvage value of expenditures for additions, improvements and replacements 0      
Repairs and maintenance expense 2,854,000 2,289,000 2,385,000  
Depreciation and amortization 9,674,000 10,030,000 11,795,000  
Impairments of long-lived assets 0 0    
Goodwill impairment loss 0 0    
Advertising costs $ 40,251,000 30,755,000 12,511,000  
Number of operating segments | Segment 1      
Number of reportable segments | Segment 1      
Operating lease right-of-use asset $ 5,855,000     $ 6,418,000
Operating lease liabilities 2,014,000      
ASU 2016-02        
Significant Accounting Policies [Line Items]        
Operating lease right-of-use asset 6,400,000      
Operating lease liabilities 6,400,000      
Cumulative effect adjustment on retained earnings 0      
Construction in Process and Computer Software or Development Cost        
Significant Accounting Policies [Line Items]        
Depreciation and amortization 0 0 $ 0  
Other Noncurrent Assets        
Significant Accounting Policies [Line Items]        
Noncurrent inventories expected to be realized or consumed 1,076,000 1,085,000    
Customer Concentration Risk | Customer One        
Significant Accounting Policies [Line Items]        
Accounts receivable, net 10,695,000 16,198,000    
Customer Concentration Risk | Customer Two        
Significant Accounting Policies [Line Items]        
Accounts receivable, net $ 5,228,000 $ 4,155,000    
Sales Revenue, Net | Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Number of customers | Customer 0 1 1  
Net Accounts Receivable | Customer Concentration Risk        
Significant Accounting Policies [Line Items]        
Number of customers | Customer 2 2    
Raw materials | Supplier Concentration Risk | Vendor one        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 23.20% 20.00%    
Raw materials | Supplier Concentration Risk | Vendor two        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 13.90% 11.90%    
Raw materials | Supplier Concentration Risk | Vendor three        
Significant Accounting Policies [Line Items]        
Concentration risk, percentage 9.40% 10.20%    
Fair Value Measurements Recurring | Level 3 | Maximum        
Significant Accounting Policies [Line Items]        
Earnout Liability $ 31,400,000      
Forward Contracts        
Significant Accounting Policies [Line Items]        
Payable 514,000      
Accounts receivable, net   $ 472,000    
Lifetime Warranties | Direct-to-Consumer        
Significant Accounting Policies [Line Items]        
Sales revenue $ 17,728,000 $ 14,874,000