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Stock-Based Compensation - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2018 USD ($) item shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 shares | Dec. 31, 2015 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost | $ 4,700,000 |  |  |
Cash received from stock option exercises | 5,100,000 |  |  |
Cash used for shares withheld to satisfy employee tax obligations for RSUs and PRSUs converted | $ 5,900,000 |  |  |
Shares authorized for future grant under stock plan (in shares) | shares | 1,300,000 |  |  |
Non-qualified stock options |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options vesting period | 3 years |  |  |
Options expiration period | 10 years |  |  |
Period of historical option activity considered to determine expected option life | 10 years |  |  |
Number of separate employee groups | item | 2 |  |  |
Unrecognized compensation cost | $ 1,300,000 | $ 1,200,000 |  |
Non-qualified stock options | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 1 year |  |  |
Non-qualified stock options | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 3 years |  |  |
RSUs |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares outstanding | shares | 452,176 | 500,000 | 500,000 | 500,000
RSUs | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 1 year |  |  |
RSUs | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 3 years |  |  |
PRSUs |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Number of shares outstanding | shares | 336,305 | 400,000 | 400,000 | 400,000
Unrecognized compensation cost | $ 2,000,000 |  |  |
Performance period | 3 years | 3 years | 3 years |
PRSUs | Minimum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 1 year |  |  |
Performance period | 3 years |  |  |
PRSUs | Maximum |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Period over which unrecognized compensation costs will be recognized | 3 years |  |  |
Employee stock purchase plan |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Maximum contribution by eligible employees as percentage of base earnings (as a percent) | 10.00% |  |  |
Maximum contribution by eligible employees in a calendar year | $ 25,000 |  |  |
Common stock purchase price as percentage of fair market value (as a percent) | 85.00% |  |  |
Shares purchased under employee stock purchase plan (in shares) | shares | 57,788 | 52,824 |  |

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