CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 393,434	$ 381,742
Marketable securities	102,589	106,214
Accounts receivable, net of allowance for doubtful accounts of $890 and $866 at March 31, 2020 and December 31, 2019, respectively	45,522	60,228
Deferred commissions	12,554	14,108
Other receivables	2,683	2,432
Prepaid expenses and other	8,452	6,508
Total current assets	565,234	571,232
Property and equipment, net	39,231	39,745
Operating lease right-of-use assets	18,358	15,352
Deferred commissions, non-current	15,751	14,977
Intangible assets, net	1,639	1,651
Other assets	3,503	3,439
Total assets	643,716	646,396
Current liabilities
Accounts payable	5,501	7,057
Accrued expenses and other current liabilities	42,762	49,930
Deferred revenue	172,369	173,617
Current portion of financing obligations	1,361	1,328
Total current liabilities	221,993	231,932
Convertible senior notes, net	282,798	280,601
Deferred revenue, non-current	31,626	32,569
Other long-term liabilities	1,569	1,498
Operating lease liabilities, non-current	20,422	18,564
Financing obligations, non-current	15,536	15,889
Total liabilities	573,944	581,053
Stockholders’ equity
Preferred stock, $0.001 par value per share, 100,000,000 shares authorized, no shares issued and outstanding	0	0
Additional paid-in-capital	435,181	420,170
Accumulated deficit	(365,734)	(355,161)
Accumulated other comprehensive income	278	287
Total stockholders’ equity	69,772	65,343
Total liabilities and stockholders’ equity	643,716	646,396
Class A Common Stock
Stockholders’ equity
Common stock	38	38
Class B Common Stock
Stockholders’ equity
Common stock	$ 9	$ 9