REVENUES (Tables)
   | 
9 Months Ended | 
Sep. 30, 2022  | 
| REVENUES | 
 
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| Schedule of revenues disaggregated by category | 
 Revenues disaggregated by category were as follows (in thousands): 
 
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  | 
  | 
Three Months Ended September 30,   | 
  | 
Nine Months Ended September 30,   | 
 
  | 
  | 
2022  | 
      | 
2021  | 
  | 
2022  | 
      | 
2021  | 
 
Product sales:  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
Gross product sales  | 
  | 
$  | 
26,977   | 
  | 
$  | 
20,546   | 
  | 
$  | 
76,022   | 
  | 
  | 
58,692   | 
 
Discounts and allowances  | 
  | 
  | 
(7,789)  | 
  | 
  | 
(4,534)  | 
  | 
  | 
(22,087)  | 
  | 
  | 
(13,251)  | 
 
Total product sales, net  | 
  | 
  | 
 19,188  | 
  | 
  | 
 16,012  | 
  | 
  | 
 53,935  | 
  | 
  | 
 45,441  | 
 
Revenues from collaborations:  | 
  | 
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  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
License revenues  | 
  | 
  | 
 —  | 
  | 
  | 
2,431   | 
  | 
  | 
2,545   | 
  | 
  | 
70,354   | 
 
Development milestones  | 
  | 
  | 
 —  | 
  | 
  | 
 1,875  | 
  | 
  | 
 5,000  | 
  | 
  | 
 1,875  | 
 
Research and development services and others  | 
  | 
  | 
722   | 
  | 
  | 
225   | 
  | 
  | 
4,984   | 
  | 
  | 
1,657   | 
 
Total revenues from collaborations  | 
  | 
  | 
 722  | 
  | 
  | 
 4,531  | 
  | 
  | 
 12,529  | 
  | 
  | 
 73,886  | 
 
Government contract  | 
  | 
  | 
 2,500  | 
  | 
  | 
 1,000  | 
  | 
  | 
 2,500  | 
  | 
  | 
 9,500  | 
 
Total revenues  | 
  | 
$  | 
 22,410  | 
  | 
$  | 
 21,543  | 
  | 
$  | 
 68,964  | 
  | 
$  | 
 128,827  | 
 
 
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| Schedule of product revenue allowance and reserve categories | 
  
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Chargebacks,  | 
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Government  | 
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  | 
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  | 
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Discounts and  | 
  | 
and Other  | 
  | 
  | 
  | 
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  | 
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Fees  | 
  | 
Rebates  | 
  | 
Returns  | 
  | 
Total  | 
 
Balance as of January 1, 2022  | 
      | 
$  | 
 3,404  | 
  | 
$  | 
 2,494  | 
  | 
$  | 
 2,017  | 
  | 
$  | 
 7,915  | 
 
Provision related to current period sales  | 
  | 
  | 
 14,475  | 
  | 
  | 
 4,130  | 
  | 
  | 
 1,045  | 
  | 
  | 
 19,650  | 
 
Credit or payments made during the period  | 
  | 
  | 
 (11,920)  | 
  | 
  | 
 (4,257)  | 
  | 
  | 
 (199)  | 
  | 
  | 
 (16,376)  | 
 
Balance as of September 30, 2022  | 
   | 
$  | 
 5,959  | 
  | 
$  | 
 2,367  | 
  | 
$  | 
 2,863  | 
  | 
$  | 
 11,189  | 
 
 
 
 
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  | 
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Chargebacks,  | 
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Government  | 
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  | 
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Discounts and  | 
  | 
and Other  | 
  | 
  | 
  | 
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  | 
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Fees  | 
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Rebates  | 
  | 
Returns  | 
  | 
Total  | 
 
Balance as of January 1, 2021  | 
      | 
$  | 
 2,461  | 
   | 
$  | 
 2,115  | 
  | 
$  | 
 1,489  | 
  | 
$  | 
 6,065  | 
 
Provision related to current period sales  | 
  | 
  | 
 7,326  | 
  | 
  | 
 3,995  | 
  | 
  | 
 739  | 
  | 
  | 
 12,060  | 
 
Credit or payments made during the period  | 
  | 
  | 
 (7,073)  | 
  | 
  | 
 (3,367)  | 
  | 
  | 
 (387)  | 
  | 
  | 
 (10,827)  | 
 
Balance as of September 30, 2021  | 
   | 
$  | 
 2,714  | 
  | 
$  | 
 2,743  | 
  | 
$  | 
 1,841  | 
  | 
$  | 
 7,298  | 
 
 
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| Schedule of revenues from product sales disaggregated by customers | 
 The following table summarizes the percentages of revenues from each of our customers who individually accounted for 10% or more (wherein * denotes less than 10%) of the total net product sales and revenues from collaborations: 
 
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  | 
  | 
Three Months Ended September 30,   | 
  | 
  | 
Nine Months Ended September 30,   | 
 
  | 
  | 
2022  | 
      | 
2021  | 
  | 
  | 
2022  | 
      | 
2021  | 
 
McKesson Specialty Care Distribution Corporation  | 
  | 
  | 
44%  | 
  | 
  | 
35%  | 
  | 
  | 
  | 
38%  | 
  | 
  | 
17%  | 
 
Cardinal Healthcare  | 
  | 
  | 
27%  | 
  | 
  | 
18%  | 
  | 
  | 
  | 
22%  | 
  | 
  | 
*  | 
 
ASD Healthcare and Oncology Supply  | 
  | 
  | 
25%  | 
  | 
  | 
25%  | 
  | 
  | 
  | 
21%  | 
  | 
  | 
15%  | 
 
Lilly  | 
  | 
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*  | 
  | 
  | 
12%  | 
  | 
  | 
  | 
*  | 
  | 
  | 
56%  | 
 
Kissei  | 
  | 
  | 
*  | 
  | 
  | 
*  | 
  | 
  | 
  | 
11%  | 
  | 
  | 
*  | 
 
 
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