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Stockholders' Equity - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Class Of Stock [Line Items] |  |
Stock-based compensation, unrecognized expense, nonvested granted awards | $ 6,419 | $ 13,285
401(k) Retirement Savings Plan |  |
Class Of Stock [Line Items] |  |
Defined benefit plan, contributed by employer net of forfeitures | $ 417 | $ 293
Stock options |  |
Class Of Stock [Line Items] |  |
Rate of reduced stock-based compensation expense for estimated forfeiture | 7.30% | 7.30%
Time based restricted stock units |  |
Class Of Stock [Line Items] |  |
Vesting period | 4 years |
Time based restricted stock awards |  |
Class Of Stock [Line Items] |  |
Vesting period | 4 years |
Performance and time based restricted stock awards |  |
Class Of Stock [Line Items] |  |
Vesting period | 3 years |
Performance and time based restricted stock units |  |
Class Of Stock [Line Items] |  |
Vesting period | 3 years |
Restricted stock units and restricted stock awards |  |
Class Of Stock [Line Items] |  |
Unrecognized compensation cost related to unvested employee excluding estimated forfeitures | $ 12,214 |
Amount expected to recognized over weighted-average period | 2 years 9 months 18 days |
Rate of reduced stock-based compensation expense for estimated forfeiture | 4.70% | 5.70%
Maximum | Stock options |  |
Class Of Stock [Line Items] |  |
Stock option period, expiration | 10 years |
Vesting period | 4 years |
Minimum | Stock options |  |
Class Of Stock [Line Items] |  |
Stock option period, expiration | 7 years |
Vesting period | 1 year |
2002 Plan |  |
Class Of Stock [Line Items] |  |
Stock option shares outstanding | 18,949 |
Number of equity awards available for grant | 0 |
2012 Plan |  |
Class Of Stock [Line Items] |  |
Stock option shares outstanding | 279,171 |
Number of equity awards available for grant | 0 |
2014 Plan |  |
Class Of Stock [Line Items] |  |
Stock option shares outstanding | 1,414,048 |
Number of equity awards available for grant | 1,914,110 |
Terms of shares available for issuance | The number of shares available for issuance under the 2014 Plan also is increased annually on the first day of each fiscal year equal to the least of: 895,346 shares; 4% of the outstanding shares of common stock as of the last day of the Company's immediately preceding fiscal year; or such other amount as the Company's board of directors may determine. |
Common stock capital shares reserved for future issuance maximum annual increase | 895,346 |
Percentage on outstanding shares of common stock | 4.00% |
Number of additional number of shares reserve to provision | 839,054 |
2012 Plan and 2002 Plan | Maximum |  |
Class Of Stock [Line Items] |  |
Stock option shares outstanding | 2,328,569 |
2014 ESPP Plan |  |
Class Of Stock [Line Items] |  |
Number of equity awards available for grant | 759,967 |
Terms of shares available for issuance | The number of shares available for sale under the ESPP is increased annually on the first day of each fiscal year equal to the least of: 179,069 shares; 1.5% of the outstanding shares of the Company?s common stock on the last day of the Company?s immediately preceding fiscal year; or such other amount as may be determined by the administrator. |
Percentage on outstanding shares of common stock | 1.50% |
Number of additional number of shares reserve to provision | 179,069 |
Maximum percentage of common stock eligible to purchase through payroll deductions for participants | 15.00% |
Maximum number of shares available for participant to purchase during period | 1,500 |
Purchase price as percentage of stock price on offering period | 85.00% |
Purchase price as percentage of stock price on exercise date | 85.00% |
Potential increase of shares available for issuance | 179,069 |

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