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Income Taxes - Schedule of Income Tax Effect of Each Type of Temporary Difference and Carryforward (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 35,977 | $ 34,450
Credit carryforwards | 10,472 | 6,562
Stock-based compensation | 2,953 | 1,945
Landlord allowance on leasehold improvements |  | 1,908
Lease liability | 17,965 |
Intangible Assets | 62 |
Deferred rent |  | 873
Accruals and reserves | 1,185 | 1,074
Deferred tax assets | 68,614 | 46,812
Valuation Allowance | (62) |
Valuation Allowance, net | 68,552 | 46,812
Deferred tax liabilities: |  |
Prepaid expenses | (1,523) | (931)
Deferred commissions | (5,100) | (3,187)
Right of use assets | (15,270) |
Unbilled revenue |  | (227)
Fixed assets | (4,230) | (3,581)
Deferred tax liability | (26,123) | (7,926)
Net deferred tax assets | $ 42,429 | $ 38,886

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