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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) Segment $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) | May 24, 2016 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Letter of credit, amount |  |  | $ 500 |  |
Long-term marketable securities, minimum original maturity term |  |  | 1 year |  |
Investment fund | $ 0 | $ 0 |  |  |
Gain (loss) on investments | 0 | 0 | $ 0 |  |
Fair value of other assets | 0 | 0 |  |  |
Fair value of other liabilities | $ 0 | $ 0 |  |  |
Stock options, outstanding | shares | 998,226 | 734,940 |  |  |
Stock options, weighted average exercise price | $ / shares | $ 27.54 | $ 20.80 |  |  |
Common stock excluded from calculation of diluted earnings per share | shares | 479,854 | 317,923 | 381,686 |  |
Number of operating segment | Segment | 1 |  |  |  |
Number of reporting segment | Segment | 2 |  |  |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  |
New accounting pronouncement, cumulative effect of change on cash, cash equivalents and restricted cash | (677,000) |  |  |  |
Advertising Expense | 200,000 | 200,000 | 400,000 |  |
Deferred Rent Credit | 4,000,000 |  |  |  |
Cash and Cash Equivalents, at Carrying Value | 193,822,000 | 173,759,000 | 122,233,000 |  |
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 126,600,000 |  |  |  |
ASU No. 2016-18 | Cash, Cash Equivalents and Restricted Cash |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
New accounting pronouncement, cumulative effect of change on cash, cash equivalents and restricted cash |  |  | $ 450,000 | $ 450,000 |
2.125% Convertible Senior Notes due 2021 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Principal amount |  | 11,000 |  |  | $ 115,000,000
Notes, due date | Jun. 01, 2021 |  |  |  |
Notes, frequency of periodic payment | Semi-annually |  |  |  |
Notes, date of first required payment | Dec. 01, 2016 |  |  |  |
Total convertible senior notes | $ 103,488,000 | $ 99,250,000 |  |  |
Fair value of convertible senior notes | 184,600,000 |  |  |  |
Minimum |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Short-term marketable securities, minimum original maturity term |  |  | 90 days |  |
Operating Lease Right Of Use Asset | 12,000,000 |  |  |  |
Lease Liability | 16,000,000 |  |  |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Operating Lease Right Of Use Asset | 14,000,000 |  |  |  |
Lease Liability | $ 18,000,000 |  |  |  |
Option To Purchase Common Stock |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Stock options, outstanding | shares | 998,226 | 734,940 | 1,236,586 |  |
Stock options, weighted average exercise price | $ / shares | $ 27.54 | $ 20.80 | $ 12.05 |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted stock units, outstanding | shares | 705,413 | 505,235 |  |  |
Restricted Stock Units (RSUs) | Awards Granted to Non-Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 8.00% |  |  |  |
Restricted Stock Units (RSUs) | Awards Granted to Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 3.00% |  |  |  |
Employee Stock Option | Awards Granted to Non-Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 8.00% |  |  |  |
Employee Stock Option | Awards Granted to Executive Level Employees |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 3.00% |  |  |  |
Non-Employee Directors |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Estimated forfeiture rates | 0.00% |  |  |  |

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