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FAIR VALUE MEASUREMENTS - EQUITY INVESTMENT (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 03, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2007
Equity Investments [Line Item] |  |  |  |  |  |
Number of shares owned | 35,990,825 |  |  |  |  |
Description of acquisition of Sienna Cancer Diagnostics by BARD1 Life Sciences | we received 13 BARD1 shares for every five shares of Sienna ordinary shares, resulting in our ownership of 35,990,825 shares of BARD1. |  |  |  |  |
Proceeds from sales of equity investment |  |  |  | $ 339,000 |  |
Equity Investment |  |  |  |  |  |
Equity Investments [Line Item] |  |  |  |  |  |
Number of shares owned |  | 20,667,886 |  | 20,667,886 |  | 13,842,625
Cost method investments cost basis |  |  |  |  |  | $ 0
Realized investment gain (loss) | $ 182,000 | $ (34,000) |  |  |  |
Number of shares sold |  | 15,322,939 |  |  |  |
Proceeds from sales of equity investment |  | $ 339,000 |  |  |  |
Fair value of equity investment |  | 385,000 |  | $ 385,000 |  |
Increase (decrease) in fair value of equity investment |  | (118,000) | $ (195,000) | 109,000 | $ (195,000) |
Gains (losses) related to foreign currency translation |  | $ 27,000 | $ (14,000) | $ 78,000 | $ (17,000) |
Equity Investment | Maximum |  |  |  |  |  |
Equity Investments [Line Item] |  |  |  |  |  |
Cost method investments Ownership |  |  |  |  |  | 20.00%

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