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B. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - VARIOUS POLICIES (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) patent | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Cash and cash equivalents | $ 50,224,000 | $ 28,074,000 | $ 32,175,000 | $ 22,006,000
Cash in excess of FDIC insurance | $ 40,800,000 |  |  |
Percentage of compensation deposit | 30.00% |  |  |
Restricted cash | $ 1,732,000 | 4,719,000 |  |
Pledged certificate of deposit for line of credit | 0 | 7,900,000 |  |
Accrued product warranty | $ 705,000 | 412,000 |  |
Number of years of land use rights | 50 years |  |  |
Land use rights expiration date | October 7, 2054 |  |  |
Number of patents | patent | 210 |  |  |
Estimated useful life | 8 years 7 months 6 days |  |  |
Advertising Costs | $ 157,000 | $ 104,000 | $ 100,000 |
Windfall tax benefits | $ 1,300,000 |  |  |
Patents [Member] |  |  |  |
Estimated useful life | 20 years |  |  |
Sales Revenue, Net [Member] | Five Customers [Member] |  |  |  |
Concentration of credit risk | 87.80% | 81.80% | 72.00% |
Sales Revenue, Net [Member] | Amazon [Member] |  |  |  |
Concentration of credit risk | 54.60% | 52.50% | 45.80% |
Sales Revenue, Net [Member] | Microsoft [Member] |  |  |  |
Concentration of credit risk | 18.30% | 11.60% |  |
Sales Revenue, Net [Member] | Cisco [Member] |  |  |  |
Concentration of credit risk |  | 10.40% | 8.90% |
Sales Revenue, Net [Member] | Arris [Member] |  |  |  |
Concentration of credit risk | 5.80% |  |  |
Sales Revenue, Net [Member] | Leading Internet Service Provider [Member] |  |  |  |
Concentration of credit risk |  |  | 6.70% |
Accounts Receivable [Member] | Five Customers [Member] |  |  |  |
Concentration of credit risk | 88.30% | 80.00% |  |
Accounts Receivable [Member] | Amazon [Member] |  |  |  |
Concentration of credit risk | 62.10% | 51.40% |  |
Accounts Receivable [Member] | Arris [Member] |  |  |  |
Concentration of credit risk | 10.60% |  |  |
Accounts Receivable [Member] | Wesco [Member] |  |  |  |
Concentration of credit risk |  | 14.40% |  |
Foreign Accounts [Member] |  |  |  |
Cash and cash equivalents | $ 10,700,000 | $ 8,900,000 |  |
TAIWAN, PROVINCE OF CHINA |  |  |  |
Certificates of deposit | $ 0 | $ 7,900,000 |  |
Percentage of collateral pledged | 100 |  |  |
TAIWAN, PROVINCE OF CHINA | Minimum |  |  |  |
Maturity dates | 6 months |  |  |
TAIWAN, PROVINCE OF CHINA | Maximum |  |  |  |
Maturity dates | 12 months |  |  |

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