Debt and Lease Obligations - Additional Information (Detail) ¥ in Millions									1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 21, 2022 USD ($)	Jan. 19, 2022 USD ($) Tranche	Jan. 04, 2022 USD ($)	May 28, 2021 CNY (¥)	Jan. 05, 2021 m² ¥ / m²	Sep. 17, 2020	Jun. 19, 2020 USD ($) Tranche	May 15, 2020 CNY (¥)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2019 CNY (¥)	Jun. 30, 2022 USD ($) Qtr	Jun. 30, 2021 USD ($)	Jun. 14, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Current portion of senior secured loan									$ 23,600,000	$ 23,600,000		$ 23,600,000			$ 45,938,000
Royalty financing liability									75,006,000	75,006,000		75,006,000
Gain on extinguishment of debt										2,051,000		(1,450,000)	$ (648,000)
Third Amendment to Credit Agreement
Debt Instrument [Line Items]
Mandatory prepayment of principal percentage		62.50%
Fee percentage		7.00%
Exit fee percentage		2.00%
Prepayment fee percentage		5.00%
Amendment fee		$ 300,000
Additional mandatory prepayment in principal			$ 12,500,000
Debt instrument payments														$ 5,000,000.0
Fourth Amendment To Credit Agreement
Debt Instrument [Line Items]
Additional prepayment in principal		$ 42,500,000
Debt instrument payments									7,500,000	7,500,000		$ 7,500,000
Fourth and Fifth Amendment to Credit Agreement
Debt Instrument [Line Items]
Fee percentage		5.00%
Exit fee percentage		2.00%
Prepayment fee percentage		3.00%
Debt incremental borrowing rate												20.57%
Discount on extinguishment of debt									11,800,000	11,800,000		$ 11,800,000
Liability recorded									45,700,000	45,700,000		45,700,000
Gain on extinguishment of debt												2,100,000
Third, Fourth and Fifth Amendment to Credit Agreement
Debt Instrument [Line Items]
Debt instrument periodic payment												97,600,000
Chinese Subsidiaries | API Facility or Sintaho API Facility | Chongqing International Biological City Development & Investment Co., Ltd
Debt Instrument [Line Items]
Area of rent free lease | m²					34,517
Lease term					10 years
Renewal lease term					10 years
Payment of monthly rent per square meter | ¥ / m²					5
Revenue Interest Purchase Agreement
Debt Instrument [Line Items]
Royalty financing liability	$ 85,000,000.0
Escrow deposit	5,000,000.0								5,000,000.0	5,000,000.0		5,000,000.0
Royalty financing liability transaction cost	5,000,000.0											5,000,000.0
Senior credit agreement payment	52,500,000
Deposit and held in segregated account	7,500,000
Royalty financing fund received												$ 75,000,000.0
Royalty financing annual interest rate												28.60%
Estimated cash flows year												2035
License And Development Agreement With Almairall S.A.
Debt Instrument [Line Items]
Royalty financing fund received												$ 500,000
License Agreement With Almairall S.A. | ATNX SPV, LLC
Debt Instrument [Line Items]
Milestone payments payable	$ 155,000,000.0
Milestone interests percentage	50.00%
Royalties payment percentage	50.00%
Oaktree | License Agreement With Almairall S.A. | ATNX SPV, LLC
Debt Instrument [Line Items]
Percentage of equity interests	10.00%
Sagard | License Agreement With Almairall S.A. | ATNX SPV, LLC
Debt Instrument [Line Items]
Percentage of equity interests	10.00%
Senior Credit Agreement
Debt Instrument [Line Items]
Debt instrument, maximum borrowing capacity							$ 225,000,000.0
Line of credit due									57,500,000	57,500,000		$ 57,500,000			$ 150,000,000.0
Number of tranches | Tranche		2					5
Debt maturity date												Jun. 19, 2026
Available borrowing capacity upon approval of oral paclitaxel							$ 75,000,000.0
Interest rate terms												The loan bears interest at a fixed annual rate of 11.0%. The Company allocated the proceeds of the drawn tranches between liability and equity components and the fair value of such equity components, along with the direct costs related to the issuance of the debt were recorded as an offset to long-term debt on the consolidated balance sheets. The debt discount and financing fees are amortized on a straight-line basis, which approximates the effective interest method, over the remaining maturity of the Senior Credit Agreement. The effective interest rate of Tranches A, B and D, including the amortization of debt discount and financing fees amounts to 13.3% annually. The Company is required to make quarterly interest-only payments until June 19, 2022, after which the Company is required to make quarterly amortizing payments, with the remaining balance of the principal plus accrued and unpaid interest due at maturity.
Bearing interest at a fixed annual rate							11.00%
Commitment fee percentage will be paid						0.60%
Exit fee liability									$ 1,200,000	1,200,000		$ 1,200,000
Mandatory prepayment of principal percentage		62.50%
Fee percentage		7.00%							5.00%
Exit fee percentage		2.00%							2.00%
Prepayment fee percentage		5.00%							3.00%
Amendment fee		$ 300,000
Additional mandatory prepayment in principal		12,500,000
Minimum liquidity amount in cash or permitted cash equivalent investments amount							$ 20,000,000.0
Line of credit from first step up date until maturity							25,000,000.0
Line of credit facility second step up date outstanding amount							225,000,000.0
Line of credit from second step up date until maturity							$ 30,000,000.0
Minimum revenue percentage							50
Gain on extinguishment of debt												(3,500,000)
Senior Credit Agreement | Third Amendment on January 2022
Debt Instrument [Line Items]
Available borrowing capacity upon approval of oral paclitaxel		$ 0
Senior Credit Agreement | Fourth Amendment To Credit Agreement
Debt Instrument [Line Items]
Minimum revenue percentage							70
Senior Credit Agreement | Fifth Amendment To Credit Agreement
Debt Instrument [Line Items]
Revenue targets minimum liquidity amount decreased												10,000,000.0
Senior Credit Agreement | Minimum
Debt Instrument [Line Items]
Line of credit facility first step up date outstanding amount							$ 150,000,000.0
Senior Credit Agreement | Minimum | Fourth Amendment To Credit Agreement
Debt Instrument [Line Items]
Covenant leverage ratio							4.50
Senior Credit Agreement | Maximum
Debt Instrument [Line Items]
Covenant leverage ratio							4.50
Senior Credit Agreement | Tranche A,B and D
Debt Instrument [Line Items]
Debt instrument, amount drawn									$ 150,000,000.0	150,000,000.0		150,000,000.0
Amortization of debt discount financing fees percentage							13.30%
Senior Credit Agreement | Tranche C and E
Debt Instrument [Line Items]
Debt instrument, amount drawn									75,000,000.0	75,000,000.0		75,000,000.0
Senior Credit Agreement | Tranche C 90 Days After Closing Date Through June 20, 2022
Debt Instrument [Line Items]
Debt instrument, amount drawn							$ 25,000,000.0
Credit Agreement
Debt Instrument [Line Items]
Debt instrument, maximum borrowing capacity									800,000	800,000		800,000
Debt maturity date				May 28, 2022
Credit agreement repaid date								May 14, 2021
Dunkirk Transaction
Debt Instrument [Line Items]
Current portion of senior secured loan									23,600,000	23,600,000		$ 23,600,000
Number Of quarterly payments | Qtr												1
Senior secured loan as long-term debt									22,100,000	22,100,000		$ 22,100,000
Debt discount and financing fees									11,800,000	11,800,000		11,800,000
Dunkirk Transaction | Quarterly Payment One
Debt Instrument [Line Items]
Current portion of senior secured loan									3,100,000	3,100,000		3,100,000
Dunkirk Transaction | Quarterly Payment Two
Debt Instrument [Line Items]
Current portion of senior secured loan									2,800,000	2,800,000		2,800,000
Dunkirk Transaction | Quarterly Payment Three
Debt Instrument [Line Items]
Current portion of senior secured loan									2,800,000	2,800,000		2,800,000
Dunkirk Transaction | Quarterly Payment Four
Debt Instrument [Line Items]
Current portion of senior secured loan									2,800,000	2,800,000		2,800,000
Dunkirk Transaction | Expected To Be Due From Sale of Operations
Debt Instrument [Line Items]
Current portion of senior secured loan									12,000,000.0	12,000,000.0		$ 12,000,000.0
Chongqing Maliu Riverside Development and Investment Co., LTD ("CQ")
Debt Instrument [Line Items]
Line of credit facility percentage of periodic payment year one											20.00%
Line of credit facility percentage of periodic payment year two											30.00%
Line of credit frequency of payments												The Company is required to repay the principal amount with accrued interest within three years after the plant receives the cGMP certification, with 20% of the total loan with accrued interest due within the first twelve months following receiving the certification, 30% of the total loan with accrued interest due within twenty-four months, and the remaining balance with accrued interest due within thirty-six months.
Line of credit due									7,500,000	7,500,000		$ 7,500,000
China | Credit Agreement
Debt Instrument [Line Items]
Debt instrument, maximum borrowing capacity | ¥				¥ 5.0				¥ 5.0
China | Chongqing Maliu Riverside Development and Investment Co., LTD ("CQ")
Debt Instrument [Line Items]
Debt instrument, maximum borrowing capacity									$ 7,500,000	$ 7,500,000	¥ 50.0	$ 7,500,000
Long-term line of credit, interest rate											4.75%