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Summary Of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) Segment $ / shares shares | Dec. 31, 2018 USD ($) Segment $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Jul. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Gain (loss) on investments |  | $ 0 | $ 0 |  |
Stock options, outstanding | shares | 957,559 | 998,226 |  |  |
Stock options, weighted average exercise price | $ / shares | $ 30.81 | $ 27.54 |  |  |
Common stock excluded from calculation of diluted earnings per share | shares | 104,316 | 479,854 | 317,923 |  |
Convertible senior notes | shares | 0 | 1,123,139 | 474,923 |  |
Number of operating segment | Segment | 1 |  |  |  |
Number of reporting segment | Segment | 1 | 2 |  |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  |
Advertising Expense | 100,000 | 200,000 | 200,000 |  |
Operating Lease, ROU assets | 25,707,000 |  |  |  |
Deferred Rent Credit |  | 4,000,000.0 |  |  |
Lease liabilities | 30,552,000 |  |  |  |
Cash and cash equivalents | 528,392,000 | 193,822,000 | $ 173,759,000 |  |
Restricted Cash | 9,000,000.0 |  |  |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 415,600,000 | $ 126,600,000 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating Lease, ROU assets |  |  |  |  | $ 17,000,000.0
Lease liabilities |  |  |  |  | $ 21,000,000.0
0.375% Convertible Senior Notes due 2024 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Principal amount |  |  |  | $ 287,500,000 |
Notes, due date | Jul. 15, 2024 |  |  |  |
Notes, frequency of periodic payment | semi-annually |  |  |  |
Total convertible senior notes |  |  |  | 296,100,000 |
Fair value of convertible senior notes |  |  |  | $ 232,800,000 |
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 | shares | 957,559 | 998,226 | 734,940 |  |
Stock options, weighted average exercise price | $ / shares |  | $ 27.54 | $ 20.80 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted stock units, outstanding | shares | 734,984 | 705,413 | 505,235 |  |
Restricted Stock Units (RSUs) | Awards Granted to Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 3.00% |  |  |  |
Restricted Stock Units (RSUs) | Awards Granted to Non-Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 8.00% |  |  |  |
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% |  |  |  |

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