CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 136,467	$ 74,363
Short-term investments	105,634	137,904
Accounts receivable (net of allowance for doubtful accounts of $297 and $764 at June 30, 2020 and December 31, 2019, respectively)	81,782	94,827
Deferred commissions	29,620	28,499
Prepaid expenses and other current assets	26,298	27,369
Total current assets	379,801	362,962
Property and equipment, net	35,144	26,847
Deferred commissions (net of current portion)	42,148	43,766
Operating lease right-of-use assets	40,476	42,847
Acquired intangible assets, net	14,350	15,508
Goodwill	54,138	54,138
Other assets	9,779	12,544
Total assets	575,836	558,612
Current liabilities:
Accounts payable	429	1,732
Accrued expenses	7,909	8,436
Accrued compensation	31,360	36,634
Deferred revenue	274,953	274,348
Operating lease liabilities	5,347	5,209
Other current liabilities	783	1,284
Total current liabilities	320,781	327,643
Deferred revenue (net of current portion)	90,356	88,779
Operating lease liabilities (net of current portion)	48,678	40,663
Other liabilities	4,853	2,622
Total liabilities	464,668	459,707
Stockholders’ equity:
Common stock (par value: $0.01; 500,000 shares authorized; 101,127 and 98,587 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively)	1,011	986
Additional paid-in capital	710,066	662,990
Accumulated other comprehensive income	149	50
Accumulated deficit	(600,058)	(565,121)
Total stockholders’ equity	111,168	98,905
Total liabilities and stockholders’ equity	$ 575,836	$ 558,612