CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (131,055)	$ (78,715)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	32,427	25,002
Stock and unit-based compensation	117,365	30,120
Loss on debt extinguishment	3,380	5,620
Amortization of discount and debt issue costs	748	1,081
Loss on remeasurement of contingent consideration	614	557
Endowment of shares to LifeStance Health Foundation	0	9,000
Change in operating assets and liabilities, net of businesses acquired:
Patient accounts receivable, net	(21,900)	(11,831)
Prepaid expenses and other current assets	(5,351)	(14,964)
Accounts payable	1,731	2,261
Accrued payroll expenses	(289)	9,580
Other accrued expenses	13,471	15,283
Net cash provided by (used in) operating activities	11,141	(7,006)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(53,775)	(31,803)
Acquisitions of businesses, net of cash acquired	(35,118)	(39,126)
Net cash used in investing activities	(88,893)	(70,929)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from initial public offering, net of underwriters discounts and commissions and deferred offering costs	0	554,169
Issuance of common units to new investors	0	1,000
Proceeds from long-term debt, net of discount	228,000	98,800
Payments of debt issue costs	(7,184)	(2,360)
Payments of long-term debt	(181,230)	(310,729)
Prepayment for debt paydown	(1,609)	0
Payments of contingent consideration	(11,090)	(5,587)
Taxes related to net share settlement of equity awards	(478)	0
Net cash provided by financing activities	26,409	335,293
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(51,343)	257,358
Cash and Cash Equivalents - Beginning of period	148,029	18,829
CASH AND CASH EQUIVALENTS – END OF PERIOD	96,686	276,187
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash paid for interest	4,927	24,889
Cash paid for taxes, net of refunds	860	900
SUPPLEMENTAL DISCLOSURES OF NON CASH INVESTING AND FINANCING ACTIVITIES
Unpaid deferred offering costs included in accounts payable and other accrued expenses	0	5,264
Equipment financed through capital leases	256	14
Contingent consideration incurred in acquisitions of businesses	5,683	2,739
Acquisition of property and equipment included in liabilities	13,055	10,233
Issuance of common units for acquisitions of businesses	$ 0	$ 1,486