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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | Jan. 01, 2017
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income | $ (3,282) |  |  |  | $ (1,609) |  |  |  | $ (3,282) | $ (1,609) |  |  |
Retained earnings | 541,890 |  |  |  | 563,593 |  |  |  | 541,890 | 563,593 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 87,903 | 115,865 | $ 145,725 |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (88,262) | (87,319) | (172,318) |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  | (29,908) | (55,230) | (42,101) |  |
Additional paid-in capital | 188,471 |  |  |  | 181,778 |  |  |  | 188,471 | 181,778 |  |  |
Effect of foreign currency exchange rates on cash and cash equivalents |  |  |  |  |  |  |  |  | (282) | (299) | 226 |  |
Net change in total cash |  |  |  |  |  |  |  |  | (30,549) | (26,983) | (68,468) |  |
Total cash, cash equivalents, and restricted cash, beginning of period |  |  |  | $ 192,907 |  |  |  | $ 219,890 | 192,907 | 219,890 | 288,358 |  |
Total cash, cash equivalents, and restricted cash, end of period | 162,358 |  |  |  | 192,907 |  |  |  | 162,358 | 192,907 | 219,890 |  |
Valuation allowance | 39,406 |  |  |  | 31,442 |  |  |  | 39,406 | 31,442 |  |  |
Operating Expenses | $ 113,824 | $ 105,368 | $ 104,967 | $ 101,186 | 97,488 | $ 90,395 | $ 102,035 | 100,266 | $ 425,345 | 390,184 | 425,885 |  |
ASU 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investments that do not have readily determinable fair values |  |  |  |  |  |  |  |  |  |  |  | $ 20,100 |
Equity investments |  |  |  |  |  |  |  |  |  |  |  | 600 |
Restatement Adjustment | Accounting Standards Update 2016-15 and 2018-18 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  | (5,525) |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  | (1,178) |  |
Net change in total cash |  |  |  |  |  |  |  |  |  |  | (6,703) |  |
Total cash, cash equivalents, and restricted cash, beginning of period |  |  |  |  |  |  |  | 11,934 |  | 11,934 | 18,637 |  |
Total cash, cash equivalents, and restricted cash, end of period |  |  |  |  |  |  |  |  |  |  | 11,934 |  |
Restatement Adjustment | ASU 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Other Income |  |  |  |  |  |  |  |  |  |  | 200 |  |
Operating Expenses |  |  |  |  |  |  |  |  |  |  | 200 |  |
Previously Reported | Accounting Standards Update 2016-15 and 2018-18 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  | 145,725 |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  |  |  | (166,793) |  |
Net cash used in financing activities |  |  |  |  |  |  |  |  |  |  | (40,923) |  |
Effect of foreign currency exchange rates on cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 226 |  |
Net change in total cash |  |  |  |  |  |  |  |  |  |  | (61,765) |  |
Total cash, cash equivalents, and restricted cash, beginning of period |  |  |  |  |  |  |  | $ 207,956 |  | 207,956 | 269,721 |  |
Total cash, cash equivalents, and restricted cash, end of period |  |  |  |  |  |  |  |  |  |  | $ 207,956 |  |
Adjustment | ASU 2016-01 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  |  |  |  |  |  |  |  | (200) |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  | $ 200 |
Adjustment | ASU 2016-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ 300
Additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  | $ (300)
Adjustment | ASU 2018-02 | Early Adoption |  |  |  |  |  |  |  |  |  |  |  |  |
Recent accounting pronouncements |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  |  | (800) |  |  |  |  | (800) |  |  |
Retained earnings |  |  |  |  | 800 |  |  |  |  | 800 |  |  |
Valuation allowance |  |  |  |  | $ 800 |  |  |  |  | $ 800 |  |  |

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