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Description of the Company and Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Number of Operating Segments | Segment | 1 |  |  |
Effect of reclassifications on previous reported income | $ 0 |  |  |
Recognized revenue, total | 21,400,000 | $ 3,200,000 |  |
Research & development and engineering costs | 19,100,000 | 14,900,000 | $ 9,400,000 |
Decrease in pre-tax earnings and cash flow | 179,000 |  |  |
Tax asset valuation allowance | 0 | 0 |  |
Unrecognized tax benefit for uncertain tax positions, including interest and penalties | 1,055,000 | 740,000 |  |
Interest-bearing accounts insured | $ 250,000 | $ 250,000 |  |
Vendor A [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Purchases accounted | 21.00% | 15.00% | 30.00% |
Vendor B [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Purchases accounted | 11.00% | 27.00% | 15.00% |
Significant Customers [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Invoice date | 150 days |  |  |
Customer C [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated accounts receivable | 10.00% | 17.00% |  |
Customer D [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated accounts receivable | 10.00% | 11.00% |  |
Customer B [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated accounts receivable | 12.00% | 14.00% |  |
Customer B [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated accounts receivable | 14.00% | 11.00% |  |
Customer A [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated accounts receivable | 13.00% | 10.00% |  |
Consolidated net sales [Member] | Customer C [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated net sales, percentage | 10.00% | 11.00% | 10.00% |
Consolidated net sales [Member] | Customer D [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated net sales, percentage |  |  |  | 10.00%
Consolidated net sales [Member] | Customer B [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated net sales, percentage | 16.00% | 11.00% | 10.00% |
Consolidated net sales [Member] | Customer A [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Consolidated net sales, percentage | 12.00% | 11.00% | 16.00% |
Wells Fargo Bank, N.A [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Interest rates on debt | 10.00% |  |  |
Minimum [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Invoice date | 30 days |  |  |
Consolidated accounts receivable | 10.00% | 10.00% |  |
Maximum [Member] |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Invoice date | 45 days |  |  |

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