Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating losses	$ 65,494	$ 32,745
Deferred revenue	13,891	16,488
Stock-based compensation	10,032	5,581
Tax credits	7,585	5,320
Leases	10,451	2,436
Accrued compensation	918	697
Other	263	68
Total deferred tax assets	108,634	63,335
Valuation allowance	(82,237)	(47,266)
Net deferred tax assets	26,397	16,069
Deferred tax liabilities:
Deferred commissions	(15,003)	(13,273)
Property and equipment	(10,086)	(2,166)
Intangible assets	(919)	(353)
Other	(389)	(277)
Total deferred tax liabilities	(26,397)	(16,069)
Net deferred tax liabilities	$ 0	$ 0