CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 165,910	$ 153,807
Accounts receivable, net of allowance of $173 and $115	7,189	7,336
Deferred commissions, current	2,248	1,981
Prepaid expenses and other current assets	15,219	7,081
Total current assets	190,566	170,205
Property and equipment, net	45,532	117,718
Operating lease right-of-use assets	60,266	0
Capitalized internal-use software, net	33,710	33,280
Acquisition intangible assets, net	8,299	9,324
Goodwill	336,861	336,861
Deferred commissions, non-current	3,932	3,317
Other assets	8,554	8,643
Total assets	687,720	679,348
Current liabilities:
Accounts payable	2,983	2,804
Accrued expenses and other current liabilities	11,937	9,692
Accrued compensation	11,730	20,070
Deferred revenue	110,691	101,236
Operating lease liabilities, current	6,139	0
Debt, current	1,900	1,900
Total current liabilities	145,380	135,702
Deferred tax liabilities	4,341	4,246
Debt, non-current	215,040	215,515
Financing obligation on leased facility	0	92,009
Operating lease liabilities, non-current	82,528	0
Other non-current liabilities	5,436	12,493
Total liabilities	452,725	459,965
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock ($0.00001 par value; 100,000 shares authorized; no shares issued and outstanding)	0	0
Common stock ($0.00001 par value; 800,000 shares authorized; 128,060 and 125,818 shares issued and outstanding)	1	1
Additional paid-in capital	582,652	551,937
Accumulated other comprehensive loss	(306)	(287)
Accumulated deficit	(347,352)	(332,268)
Total stockholders’ equity	234,995	219,383
Total liabilities and stockholders’ equity	$ 687,720	$ 679,348