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INCOME TAXES - Company's deferred tax assets and liabilities - (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
INCOME TAXES |  |
Net operating losses | $ 59,960 | $ 50,821
Tax credits | 761 | 761
Depreciable assets | 635 | 189
Intangible assets |  | 431
Accruals and allowances | 575 | 1,317
Stock-based compensation | 83 | 62
Deferred revenue | 27,962 | 19,370
Other | 3,035 | 2,004
Total gross deferred tax assets | 93,011 | 74,955
Less: Valuation allowance | (91,315) | (73,930)
Net deferred tax assets | 1,696 | 1,025
Amortization of asset retirement obligation | (1,696) | (1,025)
Total gross deferred tax liabilities | (1,696) | (1,025)
Net deferred taxes | $ 1,696 | $ 1,025

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