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Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2020 | Jul. 31, 2019
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock options, outstanding | 696,711 | 957,559 |  |  |  |
Stock options, weighted average exercise price | $ 43.88 | $ 30.81 |  |  |  |
Common stock excluded from calculation of diluted earnings per share | 98,048 | 104,316 |  | 479,854 |  |
Convertible senior notes | 366,534 | 1,123,139 | 1,123,000 |  |  |
Advertising Expense | $ 300,000 | $ 100,000 | $ 200,000 |  |  |
Cash and cash equivalents | 717,292,000 | 528,392,000 | $ 193,822,000 |  |  |
Restricted Cash |  | $ 9,000,000.0 |  |  | $ 9,000,000.0 |
Accounts Receivable [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage |  | 10.00% |  |  |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 549,000,000.0 | $ 415,600,000 |  |  |  |
0.375% Convertible Senior Notes due 2024 |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 287,500,000
Notes, frequency of periodic payment | semi-annually |  |  |  |  |
Total convertible senior notes |  |  |  |  |  | 501,000,000.0
Fair value of convertible senior notes |  |  |  |  |  | $ 243,700,000
Senior convertible notes |  | 0.375% |  |  |  | 0.375%
Awards Granted to Executive Level Employees |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated forfeiture rates | 3.00% |  |  |  |  |
Awards Granted to Non-Executive Level Employees |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated forfeiture rates | 8.00% |  |  |  |  |
Option To Purchase Common Stock |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Stock options, outstanding | 696,711 | 957,559 | 998,226 |  |  |
Stock options, weighted average exercise price |  | $ 30.81 | $ 27.54 |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted stock units, outstanding | 665,540 | 734,984 | 705,413 |  |  |
Non-Employee Directors |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated forfeiture rates | 0.00% |  |  |  |  |
Employee Stock Option [Member] | Awards Granted to Executive Level Employees |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated forfeiture rates | 3.00% |  |  |  |  |
Employee Stock Option [Member] | Awards Granted to Non-Executive Level Employees |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated forfeiture rates | 8.00% |  |  |  |  |
Cytiva [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Concentration Risk, Percentage | 11.00% | 18.00% |  |  |  |

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