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RELATED PARTY TRANSACTIONS (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Related party transactions |  |  |
Net sales | $ 164,439,000 | $ 186,728,000 | $ 320,576,000
Gross profit | 40,220,000 | 68,158,000 | 114,334,000
Softbank and affiliates |  |  |
Related party transactions |  |  |
Net sales | 90,302,000 | 92,011,000 | 94,201,000
Cost of net sales | 59,052,000 | 51,448,000 | 33,790,000
Gross profit | 31,250,000 | 40,563,000 | 60,411,000
Accounts receivable | 19,000,000 | 12,100,000 |
Accounts payable | 0 | 0 |
Service period of sales to related party | 3 years |  |
Period over which product failure rates exceed a certain level under the penalty clause | 7 years |  |
Customer advances | 3,100,000 | 4,700,000 |
Deferred revenue current | 2,000,000 | 6,500,000 |
Deferred revenue noncurrent | 3,800,000 | 4,600,000 |
Fair value of retained ownership interest after the repurchase | 1,900,000 |  |
Ownership interest held by related party (as a percent) | 12.30% | 10.20% |
Yellowstone |  |  |
Related party transactions |  |  |
Number of directors of the entity who served as a director in related party | 1 |  |
Consulting services | 0 | 1,800,000 |
Amount paid for success fees |  |  | $ 900,000

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