CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (112,746)	$ (137,620)	$ (70,877)
Adjustments to reconcile net loss to net cash from operating activities:
Amortization of deferred implementation, solution and other costs	24,496	22,936	13,634
Depreciation and amortization	54,833	51,840	28,457
Amortization of debt issuance costs	2,038	1,977	1,467
Amortization of debt discount	25,824	21,317	15,154
Amortization of premiums on investments	1,117	366	226
Stock-based compensation expense	55,903	50,682	40,510
Realized loss on sale of marketable securities	0	(14)	0
Deferred income taxes	180	946	(12,774)
Allowance for credit losses	(25)	306	0
Allowance for sales credits	39	2	172
Loss on disposal of long-lived assets	389	151	287
Loss on extinguishment of debt	1,513	8,932	0
Impairment of intangible assets	0	0	6
Unoccupied lease charges	2,008	2,181	420
Changes in operating assets and liabilities:
Accounts receivable, net	(10,072)	(14,560)	372
Prepaid expenses and other current assets	532	(2,440)	(822)
Deferred solution and other costs	(12,776)	(15,333)	(23,548)
Deferred implementation costs	(12,847)	(16,880)	(14,296)
Contract assets	(4,165)	(3,721)	(5,191)
Other long-term assets	7,851	3,711	6,141
Accounts payable	1,757	(2,297)	1,126
Accrued liabilities	104	(685)	14,718
Deferred revenue	15,743	20,351	13,400
Deferred rent and other long-term liabilities	(10,771)	4,962	(8,015)
Net cash provided by (used in) operating activities	30,925	(2,890)	567
Cash flows from investing activities:
Purchases of investments	(124,034)	(131,337)	(27,330)
Maturities of investments	149,176	31,841	63,980
Purchases of property and equipment	(19,754)	(23,715)	(13,860)
Business combinations, net of cash acquired	(64,652)	0	(505,577)
Purchase of intangible assets	0	0	(288)
Capitalized software development costs	(5,865)	(952)	(177)
Net cash used in investing activities	(65,129)	(124,163)	(483,252)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	0	311,321	195,289
Proceeds from issuance of convertible notes, net of issuance costs	0	132,589	307,016
Purchases of capped call transactions	0	(39,830)	(40,765)
Payment for repurchases of convertible notes	(63,692)	0	0
Proceeds from bond hedges related to convertible notes	26,295	171,679	0
Payments for warrants related to convertible notes	(19,655)	(137,538)	0
Payment of contingent consideration	0	(16,862)	0
Proceeds from exercise of stock options to purchase common stock	5,892	13,317	14,551
Net cash provided by (used in) financing activities	(51,160)	434,676	476,091
Net increase (decrease) in cash, cash equivalents, and restricted cash	(85,364)	307,623	(6,594)
Cash, cash equivalents, and restricted cash, beginning of period	411,185	103,562	110,156
Cash, cash equivalents, and restricted cash, end of period	325,821	411,185	103,562
Supplemental disclosures of cash flow information:
Cash paid for taxes, net of refund	1,027	566	322
Cash paid for interest	3,104	4,096	2,853
Supplemental disclosure of non-cash investing and financing activities:
Shares acquired to settle the exercise of stock options	(200)	(966)	(941)
Impact of extinguishment of convertible senior notes due 2023	0	(40,842)	0
Data center assets acquired under deferred payment arrangements or financing arrangements	$ 0	$ 448	$ 1,104