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Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Product Information [Line Items] |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  |  |  | $ 1 | $ 1,573
Product sales allowances |  | $ 45,036 |  | $ 45,036 |  | $ 25,503 |  |
Cost of product sales |  | 17,195 | $ 7,576 | 45,745 | $ 15,940 |  |  |
Net product sales |  | 42,624 | 19,786 | 110,885 | 48,630 |  |  |
CINVANTI |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Net product sales |  | 36,400 | 16,400 | 97,600 | 32,800 |  |  |
SUSTOL |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Cost of product sales |  | 1,700 |  | 3,300 |  |  |  |
Net product sales |  | $ 6,200 | $ 3,400 | $ 13,300 | $ 15,800 |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Gross product sales | $ 2,900 |  |  |  |  |  |  |
Cost of product sales | 200 |  |  |  |  |  |  |
Accounting Standards Update 2014-09 | Product Sales Allowance |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Product sales allowances | 1,100 |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  |  |  | $ 1 | $ 1,573
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings | $ 1,600 |  |  |  |  |  |  |

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