CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 310,989	$ 120,232
Marketable securities	302,978	487,515
Accounts receivable, net of allowances for credit losses of $4,775 and $3,533 at March 31, 2020 and December 31, 2019, respectively	90,057	102,829
Prepaid expenses and other current assets	16,572	12,830
Total current assets	720,596	723,406
Capitalized software development costs, net	11,015	10,032
Property and equipment, net	13,155	13,024
Intangible assets, net	15,977	17,520
Goodwill	185,138	185,138
Operating lease right-of-use assets	11,449	12,549
Other assets	54,044	52,883
Total assets	1,011,374	1,014,552
Current liabilities:
Accounts payable	11,357	7,401
Accrued expenses and other current liabilities	20,378	30,098
Deferred revenue	161,289	162,552
Short-term portion of operating lease liabilities	4,555	4,938
Short-term portion of contingent consideration	2,008	2,008
Total current liabilities	199,587	206,997
Operating lease liabilities, noncurrent	9,734	10,606
Convertible senior notes, net	389,875	384,343
Contingent consideration	4,499	4,354
Deferred tax liabilities, net	4,584	4,571
Deferred revenue, noncurrent	128	163
Total liabilities	608,407	611,034
Commitments and contingencies (Note 7)
Redeemable non-controlling interest (Note 3)	6,778	4,905
Stockholders' equity:
Common stock	564	559
Additional paid-in capital	569,799	561,275
Accumulated other comprehensive income	66	377
Accumulated deficit	(174,240)	(163,598)
Total stockholders' equity	396,189	398,613
Total liabilities, redeemable non-controlling interest, and stockholders' equity	$ 1,011,374	$ 1,014,552