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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) Customer Segment | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of major customers representing outstanding trade receivables | Customer | 2 |  | 3
Life of inventory | 2 years |  |
Protracted length of inventory | 1 year |  |
Inventory valuation reserves | $ 1,600,000 |  | $ 1,800,000
Estimated useful life of intangible assets | 10 years |  |
Number of reportable segments | Segment | 1 |  |
Impairment charges on long-lived assets | $ 0 | $ 0 |
Period of warranty | 1 year |  |
Warranty claim liability | $ 0 |  | 0
Other current assets | 6,333,000 |  | 4,755,000
Other assets | 2,341,000 |  | 2,579,000
Debt - current | 4,527,000 |  | 2,956,000
Debt - non-current | $ 15,301,000 |  | 16,848,000
Computer Software, Intangible Asset |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Enterprise resource planning system, estimated useful life | 5 years |  |
Accounting Standards Update 2015-03 | Scenario, Previously Reported |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other current assets |  |  | 32,000
Other assets |  |  | 36,000
Accounting Standards Update 2015-03 | Scenario, Adjustment |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Other current assets |  |  | (32,000)
Other assets |  |  | (36,000)
Debt - current |  |  | (32,000)
Debt - non-current |  |  | $ (36,000)
Trade Accounts Receivable | Customer Concentration Risk |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 48.00% |  | 49.00%
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 3 years |  |
Maximum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life of property and equipment | 5 years |  |

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