STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended		12 Months Ended
	Feb. 03, 2020	Aug. 06, 2019 shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 Days $ / shares shares	Dec. 31, 2016 shares	Aug. 05, 2019 shares
Class of Warrant or Right [Line Items]
Stock split ratio	0.25
Repayment of debt | $				$ 6,937	$ 2,075
HC Group Holdings I, LLC
Class of Warrant or Right [Line Items]
Percentage of common stock			0.706
Credit Agreements, Entered Into 2019 | Notes Payable
Class of Warrant or Right [Line Items]
Repayment of debt | $			$ 125,000
Common Stock | Public Offering
Class of Warrant or Right [Line Items]
Additional shares issued (in shares)			20,700,000
Shares issued, price per share (in usd per share) | $ / shares			$ 12.50	$ 12.50
Proceeds from issuance of equity | $			$ 118,900
Common Stock | Public Offering | Option Care Health, Inc
Class of Warrant or Right [Line Items]
Additional shares issued (in shares)			10,000,000
Common Stock | Public Offering | HC Group Holdings I, LLC
Class of Warrant or Right [Line Items]
Additional shares issued (in shares)			10,700,000
Common Stock | 2017 Warrants
Class of Warrant or Right [Line Items]
Number of shares purchasable through warrants (in shares)			1,400,000	1,400,000		1,400,000		0
Common Stock | 2015 Warrants
Class of Warrant or Right [Line Items]
Number of shares purchasable through warrants (in shares)			900,000	900,000		900,000		0
OptionCare Enterprises, Inc.
Class of Warrant or Right [Line Items]
Additional shares issued (in shares)		7,048,357
Restricted Stock Units (RSUs) | Home Solutions
Class of Warrant or Right [Line Items]
Shares issued pursuant to acquisition (in shares)							1,800,000
Tranche One | Restricted Stock Units (RSUs) | Home Solutions
Class of Warrant or Right [Line Items]
Shares issued pursuant to acquisition (in shares)						800,000
Stock price threshold (in dollars per share) | $ / shares						$ 16.00
Consecutive trading days threshold | Days						20
Tranche Two | Restricted Stock Units (RSUs) | Home Solutions
Class of Warrant or Right [Line Items]
Shares issued pursuant to acquisition (in shares)						1,000,000.0
Stock price threshold (in dollars per share) | $ / shares						$ 20.00
Consecutive trading days threshold | Days						20