CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 159,755	$ 94,930
Accounts receivable, net of allowance of $600 at December 31, 2019 and 2018	70,408	79,383
Deferred commissions, current	14,543	14,020
Prepaid expenses and other current assets	32,955	21,293
Total current assets	277,661	209,626
Property and equipment, net	39,554
Property and equipment, net		7,539
Operating right-of-use asset	24,205
Deferred commissions, net of current portion	28,979	15,088
Deferred tax assets	494	326
Other assets	592	601
Total assets	371,485	233,180
Current liabilities
Accounts payable	5,222	9,249
Accrued expenses	7,488	7,464
Accrued compensation and related benefits	10,691	13,796
Deferred revenue, current	82,201	95,523
Operating lease liability, current	3,836
Finance lease liability, current	1,447
Other current liabilities	1,395	2,369
Total current liabilities	112,280	128,401
Operating lease liability, net of current portion	44,416
Finance lease liability, net of current portion	2,375
Deferred revenue, net of current portion	7,139	16,145
Deferred tax liabilities	38	42
Deferred rent, net of current portion	0	15,400
Total liabilities	166,248	159,988
Stockholders’ equity
Additional paid-in capital	340,929	218,284
Accumulated other comprehensive (loss) income	(285)	542
Accumulated deficit	(135,413)	(145,640)
Total stockholders’ equity	205,237	73,192	$ 45,524	$ (63,492)
Total liabilities and stockholders’ equity	371,485	233,180
Class A Common Stock
Stockholders’ equity
Common stock	3	3
Class B Common Stock
Stockholders’ equity
Common stock	$ 3	$ 3