Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (15,473)	$ 5,914
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	2,760	1,412
Non-cash operating lease cost	1,757	1,000
Stock-based compensation	13,664	5,335
Amortization (accretion) of discounts and premiums on investments, net	(606)	(764)
Amortization of debt discount and issuance costs	7,675	2,699
Deferred income taxes	(16,628)	(10,550)
Other non-cash operating activities, net	7,509	(1,035)
Changes in operating assets and liabilities, net of effect of business acquisitions:
Accounts receivable	74,901	42,880
Deferred commissions	461	(1,177)
Prepaid expenses, other current assets, and other assets	(20,371)	(7,476)
Accounts payable	4,285	1,762
Accrued payroll and payroll related liabilities	(29,690)	(10,543)
Accrued expenses, other current liabilities, operating lease liabilities, and other liabilities	(4,919)	(595)
Deferred revenue	(5,350)	(12,824)
Net cash provided by operating activities	19,975	16,038
Cash flows from investing activities:
Purchases of property and equipment	(4,976)	(1,528)
Purchases of investments	(313,611)	(73,553)
Sales and maturities of investments	116,691	76,981
Net cash provided by (used in) investing activities	(201,896)	1,900
Cash flows from financing activities:
Proceeds from receipt of Section 16(b) disgorgement	0	4,918
Proceeds from exercise of stock options and taxes withheld	11,600	18,425
Minimum tax withholding paid on behalf of employees for restricted stock units	(9,945)	(2,439)
Other financing activity	(433)	(1,305)
Net cash provided by financing activities	1,222	19,599
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,228)	(105)
Net increase (decrease) in cash, cash equivalents and restricted cash	(181,927)	37,432
Cash, cash equivalents and restricted cash—beginning of period	411,424	90,961
Cash, cash equivalents and restricted cash—end of period	229,497	128,393
Supplemental disclosure of cash flow information:
Cash paid for interest	2,817	0
Cash paid for income taxes	529	0
Cash paid for amounts included in the measurement of operating lease liabilities	2,061	1,187
Supplemental disclosure of noncash investing and financing activities:
Property and equipment recorded in accounts payable and accrued expenses and other current liabilities	3,167	569
Right-of-use assets obtained in exchange for new operating lease liabilities	14,400	1,604
Contingent consideration settled through issuance of common stock	$ 0	$ 750