Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 216,497	$ 195,197
Accounts receivable	75,510	74,774
Inventories	8,066	6,680
Prepaid expenses and other current assets	24,033	24,003
TOTAL CURRENT ASSETS	324,106	300,654
PATIENT EQUIPMENT, less accumulated depreciation of $366,772 and $356,888 as of September 30, 2021 and December 31, 2020, respectively	216,756	223,972
PROPERTY, EQUIPMENT AND IMPROVEMENTS, NET	21,133	25,419
INTANGIBLE ASSETS, NET	66,391	61,497
OPERATING LEASE RIGHT-OF-USE ASSETS	61,652	57,869
GOODWILL	15,580
EQUITY METHOD INVESTMENT	3,600
DEFERRED INCOME TAXES, NET	835	18,258
NOTE RECEIVABLE, RELATED PARTY	811
OTHER ASSETS	18,254	17,315
TOTAL ASSETS	729,118	704,984
CURRENT LIABILITIES
Accounts payable	108,653	116,886
Accrued payroll and related taxes and benefits	53,713	55,628
Other accrued liabilities	32,218	33,513
Deferred revenue	26,886	25,821
Current portion of operating lease liabilities	21,552	23,977
Current portion of long-term debt	31,250	20,833
TOTAL CURRENT LIABILITIES	274,272	276,658
LONG-TERM DEBT, less current portion	351,142	376,389
OPERATING LEASE LIABILITIES, less current portion	40,189	35,358
OTHER NONCURRENT LIABILITIES	40,384	42,924
TOTAL LIABILITIES	705,987	731,329
COMMITMENTS AND CONTINGENCIES (Note 8)
STOCKHOLDERS' EQUITY (DEFICIT)
Preferred stock, $0.01 par value: 100,000,000 authorized; no shares issued as of September 30, 2021 and February 10, 2021 (Note 1)
Common stock, $0.01 par value: 1,000,000,000 authorized; 35,400,884 and 35,210,915 shares issued and outstanding as of September 30, 2021 and February 10, 2021, respectively (Note 1)	354
Additional paid-in capital	955,283	954,087
Accumulated deficit	(932,506)	(980,432)
TOTAL STOCKHOLDERS' EQUITY (DEFICIT)	23,131	(26,345)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)	$ 729,118	$ 704,984