Income Taxes - Schedule of Significant Components of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 31,496	$ 25,418
Accruals and reserves	2,868	1,816
Operating lease liabilities	14,214
Deferred Rent		3,300
Other deferred tax assets	28	51
Stock-based compensation	5,217	2,871
Deferred revenue		3,264
Deferred revenue	(20)
Research credit	7,150	3,322
Total deferred tax assets	60,953	40,042
Less valuation allowance	(45,913)	(36,208)
Net deferred tax assets	15,040	3,834
Deferred tax liabilities:
Depreciation	(3,901)	(3,785)
Operating lease assets	(11,068)
Intangible assets	(40)	(49)
Other deferred tax liabilities	(20)	(22)
Total deferred tax liabilities	(15,029)	(3,856)
Long term deferred taxes, assets	$ 11
Long term deferred taxes, liabilities		$ (22)