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Summary of Significant Accounting Policies - Additional Information (Detail) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Apr. 30, 2016 USD ($) | Dec. 31, 2019 USD ($) Customer Segment shares | Dec. 31, 2018 USD ($) Customer shares | Dec. 31, 2017 USD ($) Customer shares | Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Accounts receivable written off |  | $ 0 | $ 100,000 |  |
Charge on finished goods inventory |  | 1,100,000 | 2,700,000 | $ 700,000 |
Impairment losses |  | 0 |  |  |
One-time contingent regulatory milestone payment pursuant to agreement with Ipsen Group | $ 8,000,000.0 |  |  |  |
Finite-lived intangible assets, net | $ 8,000,000.0 |  |  |  |
Amortization of intangible assets |  | 1,477,000 | 1,476,000 | 1,477,000 |
Estimated future amortization expense, 2020 |  | 1,500,000 |  |  |
Estimated future amortization expense, 2021 |  | 1,000,000.0 |  |  |
Advertising costs |  | 38,300,000 | 39,800,000 | $ 15,600,000 |
Advertising costs capitalized as prepaid expenses |  | 0 | 0 |  |
Revenue recognition |  | $ (1,704,122,000) | $ (1,468,863,000) |  |
Number of large customers | Customer |  | 4 | 4 | 4 |
Antidilutive securities to purchase common stock | shares |  | 19,516,000 | 20,824,000 | 18,526,000 |
Number of business segments | Segment |  | 1 |  |  |
Tax rate |  | 21.00% | 21.00% | 35.00% |
Customer Concentration Risk | Revenue, Product and Service Benchmark | Four Customers |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 77.00% | 85.00% | 89.00% |
Customer Concentration Risk | Accounts Receivable | Four Customers |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Concentration risk, percentage |  | 75.00% | 84.00% | 87.00% |
Topic 606 |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Cumulative-effect adjustment to retained earnings |  |  |  |  | $ 0
Increase to additional paid-in capital with corresponding increase to accumulated deficit |  |  |  |  | $ 0
Topic 606 | Difference effect of change - higher (lower) |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Revenue recognition |  | $ 0 |  |  |
ASU 2016-09 |  |  |  |  |
Summary Of Significant Accounting Policy [Line Items] |  |  |  |  |
Cumulative-effect adjustment to retained earnings |  | 300,000 |  |  |
Increase in deferred tax assets to record unrecognized excess tax benefits |  | 36,800,000 |  |  |
Increase to additional paid-in capital with corresponding increase to accumulated deficit |  | 300,000 |  |  |
Increase in deferred tax assets to record excess tax benefit |  | $ 100,000 |  |  |

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