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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accumulated Other Comprehensive Income (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) entity | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) entity
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | $ 83,777 | $ 115,329 | $ 150,380
Gain reclassified from AOCI to income | (38) |  |
Balance | $ 82,741 | 83,777 | $ 115,329
Number of inactive Chinese entities liquidation | entity |  |  | 3
Number of entities liquidated | entity | 2 |  |
Net loss from the cumulative translation adjustment | $ 100 |  | $ 100
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | 61,470 | 63,754 |
Balance | 62,002 | 61,470 | $ 63,754
Foreign currency translation |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Gain (Loss) recorded in other comprehensive loss and Unrealized loss from available-for-sale investments | 570 | (1,611) |
Unrealized gains (losses), net of tax |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Gain (Loss) recorded in other comprehensive loss and Unrealized loss from available-for-sale investments |  | (673) |
AOCI Attributable to Noncontrolling Interest |  |  |
Changes in AOCI, including the amounts reclassified to income |  |  |
Balance | $ 0 |  |
Balance |  | $ 0 |

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- Definition The increase (decrease) in cumulative translation adjustment before transfers included in determining net income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004921&loc=d3e1436-108581 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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