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Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Product Information [Line Items] |  |  |  |  |  |  |  |
Cumulative adjustment to retained earnings |  |  |  |  |  |  | $ 1 | $ 1,573
Gross product sales |  | $ 36,659 | $ 17,277 | $ 68,261 | $ 28,844 |  |  |
Product sales allowances |  | 39,625 |  | 39,625 |  | $ 25,503 |  |
Cost of product sales |  | $ 13,588 | $ 5,231 | $ 28,550 | $ 8,364 |  |  |
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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