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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 |  |

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