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Income Taxes - Significant deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Accrued expenses | $ 1,114 | $ 1,124
Stock compensation | 2,469 | 1,219
Deferred revenue | 2,036 | 2,066
Property and equipment | 229 | 176
Intangibles | 452 | 826
Goodwill | 1,444 | 1,391
Other | 8 | 8
Net operating losses | 50,119 | 40,815
Disallowed interest | 6,385 | 2,159
Valuation allowance | (63,317) | (48,499)
Total deferred tax assets | 939 | 1,285
Deferred tax liabilities |  |
Internally developed software | (943) | (1,319)
Total deferred tax liabilities | (943) | (1,319)
Net deferred tax assets (liabilities) | $ (4) | $ (34)

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