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Pay vs Performance Disclosure - USD ($)

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020


Year	SCT Total For PEO		Compensation Actually Paid (“CAP”) to PEO		SCT Total For PEO		CAP to PEO		SCT Total For PEO		CAP to PEO		Average SCT Total For Non-PEO NEOs (3)		Average CAP To Non-PEO NEOs (2)(3)		Value of Initial Fixed $100 Investment Based on TSR of:				Net Income			Adjusted EBITDA(6)
Year	Thomas S. Lam, M.D., M.P.H (1)(2)				Brandon K. Sim, M.S.(1)(2)				Kenneth Sim, M.D.(1)(2)				Average SCT Total For Non-PEO NEOs (3)		Average CAP To Non-PEO NEOs (2)(3)		ASTH(4)		S&P 500 Healthcare Index(4)(5)			(In millions)
2023	$	5,217,562	$	4,314,127	$	14,311,250	$	13,561,755	$	—	$	—	$	3,827,960	$	3,356,039	$	208	$	143		$	58		$	147
2022	$	1,487,709	$	(5,920,199)	$	15,302,775	$	997,261	$	—	$	—	$	1,667,352	$	(574,925)	$	161	$	140		$	46		$	140
2021	$	6,857,194	$	16,090,110	$	9,006,157	$	15,536,119	$	6,863,527	$	16,096,441	$	688,309	$	1,155,454	$	399	$	143		$	46		$	134
2020	$	2,515,142	$	2,412,546	$	—	$	—	$	2,521,773	$	2,419,178	$	685,422	$	695,307	$	99	$	113		$	122		$	103

Company Selected Measure Name

Adjusted EBITDA

Named Executive Officers, Footnote

The PEOs shown in the table above for each applicable fiscal year are as follows:


Year						PEOs
2023						Thomas Lam, M.D., M.P.H and Brandon K. Sim, M.S.
2022						Thomas Lam, M.D., M.P.H and Brandon K. Sim, M.S.
2021						Kenneth Sim, M.D., Thomas Lam, M.D., M.P.H and Brandon K. Sim, M.S.
2020						Kenneth Sim, M.D. and Thomas Lam, M.D., M.P.H

The Non-PEO NEOs shown in the table above for each applicable fiscal year are as follows:


Year						Non-PEO NEOs
2023						Kenneth Sim, M.D., Chandan Basho, M.B.A., and Albert Young, M.D., M.P.H.
2022						Kenneth Sim, M.D., Chandan Basho, M.B.A., Albert Young, M.D., M.P.H., and Eric Chin
2021						Eric Chin and Albert Young, M.D., M.P.H.
2020						Eric Chin, Brandon K. Sim M.S., Adrian Vazquez, M.D., and Albert Young, M.D., M.P.H.

Peer Group Issuers, Footnote

The peer group of the listed fiscal year consists of the S&P 500 Healthcare Index.

Adjustment To PEO Compensation, Footnote

As the valuation methods for compensation actually paid ("CAP") required by the SEC differ from those required in the Summary Compensation Table ("SCT"), the table below provides a reconciliation of the SCT amounts to the CAP amounts in the Pay Versus Performance table for the PEOs and Non-PEO NEOs for each of the last four fiscal years.


	PEO #1 Thomas S. Lam, M.D., M.P.H.
	2023		2022		2021		2020
Total Reported in Summary Compensation Table (SCT)	$	5,217,562	$	1,487,709	$	6,857,194	$	2,515,142
Less, Value of Stock & Option Awards Reported in SCT(1)	(3,253,500)		—		(5,777,307)		(1,450,003)
Plus, Year-End Value of Awards Granted in Fiscal Year That Are Unvested and Outstanding	2,298,000		—		5,875,821		1,486,990
Plus, Change in Fair Value of Prior Year Awards That Are Outstanding and Unvested	171,330		(3,852,379)		4,920,552		(67,429)
Plus, FMV of Awards Granted this Year That Vested this Year	—		—		—		—
Plus, Change in Fair Value (from Prior Year-End) of Prior Year awards That Vested this year	(119,265)		(3,555,529)		4,213,850		(72,154)
Less, Prior Year Fair Value of Prior Year awards That Failed to Vest this year	—		—		—		—
Plus, Dividends or Earnings Paid on Awards not Otherwise Reflected in Fair Value	—		—		—		—

Compensation Actually Paid	$	4,314,127	$	(5,920,199)	$	16,090,110	$	2,412,546


	PEO #2 Brandon K. Sim, M.S.
	2023		2022		2021
Total Reported in Summary Compensation Table (SCT)	$	14,311,250	$	15,302,775	$	9,006,157
Less, Value of Stock & Option Awards Reported in SCT(1)	(12,499,943)		(13,567,843)		(7,816,831)
Plus, Year-End Value of Awards Granted in Fiscal Year That Are Unvested and Outstanding	9,243,092		6,778,744		13,976,639
Plus, Change in Fair Value of Prior Year Awards That Are Outstanding and Unvested	1,821,347		(5,032,202)		—
Plus, FMV of Awards Granted this Year That Vested this Year	527,597		—		—
Plus, Change in Fair Value (from Prior Year-End) of Prior Year awards That Vested this year	158,412		(2,484,213)		370,154
Less, Prior Year Fair Value of Prior Year awards That Failed to Vest this year	—		—		—
Plus, Dividends or Earnings Paid on Awards not Otherwise Reflected in Fair Value	—		—		—

Compensation Actually Paid	$	13,561,755	$	997,261	$	15,536,119


	PEO #3 Kenneth Sim, M.D.
	2021		2020
Total Reported in Summary Compensation Table (SCT)	$	6,863,527	$	2,521,773
Less, Value of Stock & Option Awards Reported in SCT(1)	(5,777,307)		(1,450,003)
Plus, Year-End Value of Awards Granted in Fiscal Year That Are Unvested and Outstanding	5,875,819		1,486,991
Plus, Change in Fair Value of Prior Year Awards That Are Outstanding and Unvested	4,920,552		(67,429)
Plus, FMV of Awards Granted this Year That Vested this Year	—		—
Plus, Change in Fair Value (from Prior Year-End) of Prior Year awards That Vested this year	4,213,850		(72,154)
Less, Prior Year Fair Value of Prior Year awards That Failed to Vest this year	—		—
Plus, Dividends or Earnings Paid on Awards not Otherwise Reflected in Fair Value	—		—

Compensation Actually Paid	$	16,096,441	$	2,419,178

Non-PEO NEO Average Total Compensation Amount

$ 3,827,960

$ 1,667,352

$ 688,309

$ 685,422

Non-PEO NEO Average Compensation Actually Paid Amount

$ 3,356,039

(574,925)

1,155,454

695,307

Adjustment to Non-PEO NEO Compensation Footnote


	Average NEOs
	2023		2022		2021		2020
Total Reported in Summary Compensation Table (SCT)	$	3,827,960	$	1,667,352	$	688,309	$	685,422
Less, Value of Stock & Option Awards Reported in SCT(1)	(2,617,300)		(880,452)		(205,730)		(204,895)
Plus, Year-End Value of Awards Granted in Fiscal Year That Are Unvested and Outstanding	1,818,867		524,690		652,802		107,514
Plus, Change in Fair Value of Prior Year Awards That Are Outstanding and Unvested	180,624		(956,215)		17,308		—
Plus, FMV of Awards Granted this Year That Vested this Year	155,544		77,967		—		107,266
Plus, Change in Fair Value (from Prior Year-End) of Prior Year awards That Vested this year	(9,656)		(1,008,267)		2,765		—
Less, Prior Year Fair Value of Prior Year awards That Failed to Vest this year	—		—		—		—
Plus, Dividends or Earnings Paid on Awards not Otherwise Reflected in Fair Value	—		—		—		—

Compensation Actually Paid	$	3,356,039	$	(574,925)	$	1,155,454	$	695,307

(1)Stock option fair values are calculated at each measurement date using a Black-Scholes valuation model, consistent with the approach used to value the awards at the grant date. Stock option fair values as of each measurement date were determined using updated assumptions (the closing stock price of our Common Stock as of the measurement date, risk-free interest rate, expected life, expected volatility of the price of our Common Stock, and expected dividend yield) and fair value increases are primarily driven by an increase in the price of the Company’s Common Stock.

Compensation Actually Paid vs. Total Shareholder Return