CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 141,387	$ 74,363
Short-term investments	127,720	137,904
Accounts receivable (net of allowance for doubtful accounts of $314 and $764 at September 30, 2020 and December 31, 2019, respectively)	87,502	94,827
Deferred commissions	30,131	28,499
Prepaid expenses and other current assets	34,236	27,369
Total current assets	420,976	362,962
Property and equipment, net	39,960	26,847
Deferred commissions (net of current portion)	41,753	43,766
Operating lease right-of-use assets	41,430	42,847
Acquired intangible assets, net	13,771	15,508
Goodwill	54,138	54,138
Other assets	11,807	12,544
Total assets	623,835	558,612
Current liabilities:
Accounts payable and accrued expenses	6,248	10,168
Accrued compensation	28,244	36,634
Deferred revenue	296,360	274,348
Operating lease liabilities	6,312	5,209
Other current liabilities	1,126	1,284
Total current liabilities	338,290	327,643
Deferred revenue (net of current portion)	93,842	88,779
Operating lease liabilities (net of current portion)	55,645	40,663
Other liabilities	4,931	2,622
Total liabilities	492,708	459,707
Stockholders’ equity:
Common stock (par value: $0.01; 500,000 shares authorized; 102,755 and 98,587 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively)	1,028	986
Additional paid-in capital	735,961	662,990
Accumulated other comprehensive income	54	50
Accumulated deficit	(605,916)	(565,121)
Total stockholders’ equity	131,127	98,905
Total liabilities and stockholders’ equity	$ 623,835	$ 558,612