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Stock Award Plans and Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended | 80 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | May 02, 2012
Stock-Based Compensation |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  | $ 0.001 |
Stock-Based Compensation Expense |  |  |  |  |
Forfeiture rate (as a percent) | 5.00% | 5.00% | 5.00% |  |
Stock-based compensation expense | $ 7,800 | $ 5,700 | $ 5,200 |  |
Tax deductions in excess of recognized compensation cost | 4,100 |  |  |  |
Tax benefit | $ 900 |  |  |  |
Options |  |  |  |  |
Granted (in shares) | 0 | 0 |  |  |
Shares/units |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 617 |  |  |  |
Granted (in shares) | 459 |  |  |  |
Vested (in shares) | (245) |  |  |  |
Forfeited (in shares) | (11) |  |  |  |
Outstanding at the end of the period (in shares) | 820 | 617 |  | 820 |
Weighted-Average Grant Date Fair Value per Share |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 14.93 |  |  |  |
Granted (in dollars per share) | 22.41 |  |  |  |
Vested (in dollars per share) | 15.90 |  |  |  |
Forfeited (in dollars per share) | 17.78 |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 18.76 | $ 14.93 |  | $ 18.76 |
Common Stock |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |
Number of shares purchased under the plan | 55 | 34 | 22 |  |
Options |  |  |  |  |
Exercised (in shares) | (273) | (2,358) | (392) |  |
Employee stock purchase plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of shares of common stock available for future grant | 200,000 |  |  | 200,000 |
Employee Stock Purchase Plan |  |  |  |  |
Purchase price as a percentage of the market value of a common stock on the day the stock is purchased | 85.00% |  |  |  |
Offering period over which compensation expense is amortized | 6 months |  |  |  |
Stock-Based Compensation Expense |  |  |  |  |
Stock-based compensation expense | $ 200 | $ 100 | $ 100 |  |
Employee stock purchase plan | Maximum |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |
Payroll deductions as a percentage of employee's salary | 10.00% |  |  |  |
Number of shares purchased under the plan | 100,000 | 100,000 | 100,000 |  |
Restricted Stock Units and Restricted Stock |  |  |  |  |
Weighted-Average Grant Date Fair Value per Share |  |  |  |  |
Granted (in dollars per share) |  | $ 20.72 | $ 9.73 |  |
Restricted Stock Units and Restricted Stock | Employees |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period | 4 years |  |  |  |
Restricted Stock Units and Restricted Stock | Non-employee members of Board of Directors |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period | 6 months |  |  |  |
Stock Options |  |  |  |  |
Options |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 2,576,000 |  |  |  |
Exercised (in shares) | (273,000) |  |  |  |
Canceled (in shares) | (5,000) |  |  |  |
Expired (in shares) | (13,000) |  |  |  |
Outstanding at the end of the period (in shares) | 2,285,000 | 2,576,000 |  | 2,285,000 |
Exercisable (in shares) | 2,116,000 |  |  | 2,116,000 |
Options Vested or Expected to Vest at the end of the period (in shares) | 2,282,000 |  |  | 2,282,000 |
Weighted Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 7.91 |  |  |  |
Exercised (in dollars per share) | 6.34 |  |  |  |
Canceled (in dollars per share) | 10.04 |  |  |  |
Expired (in dollars per share) | 2.46 |  |  |  |
Outstanding at the end of the period (in dollars per share) | 8.12 | $ 7.91 |  | $ 8.12 |
Exercisable at the end of the period (in dollars per share) | 7.79 |  |  | 7.79 |
Options Vested or Expected to Vest at the end of the period (in dollars per share) | $ 8.11 |  |  | $ 8.11 |
Weighted Average Remaining Contractual Term |  |  |  |  |
Outstanding at the end of the period | 2 years 3 months 26 days |  |  |  |
Exercisable at the end of the period | 2 years 2 months 16 days |  |  |  |
Options Vested or Expected to Vest at the end of the period | 2 years 4 months 6 days |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | $ 22,128 |  |  | $ 22,128 |
Exercisable at the end of the period (in dollars) | 21,174 |  |  | 21,174 |
Options Vested or Expected to Vest at the end of the period (in dollars) | 22,109 |  |  | 22,109 |
Additional disclosure |  |  |  |  |
Total intrinsic value of options exercised (in dollars) | 4,100 | $ 39,700 | $ 2,500 |  |
Total fair value of stock options vested (in dollars) | 1,900 | $ 3,100 | $ 3,900 |  |
Weighted average grant fair value of options granted (in dollars per share) |  |  | $ 5.75 |  |
Total forfeiture adjusted unrecognized compensation cost (in dollars) | $ 700 |  |  | $ 700 |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 8 months 12 days |  |  |  |
Stock Options | Employees |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period | 4 years |  |  |  |
Period after termination to exercise awards that were vested | 90 days |  |  |  |
Period after termination to retiring employees to exercise vested awards | 1 year |  |  |  |
Stock Options | Non-employee members of Board of Directors |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Vesting period | 6 months |  |  |  |
Restricted Stock |  |  |  |  |
Shares/units |  |  |  |  |
Granted (in shares) | 0 | 0 | 0 |  |
Vested (in shares) | 0 | 0 | 0 |  |
Stock Options and Restricted Stock Units |  |  |  |  |
Estimated weighted-average assumptions |  |  |  |  |
Weighted-average expected term |  |  | 4 years 8 months 12 days |  |
Risk-free interest rate, minimum (as a percent) |  |  | 1.10% |  |
Risk-free interest rate, maximum (as a percent) |  |  | 2.00% |  |
Expected dividend yield (as a percent) |  |  | 0.00% |  |
Stock Options and Restricted Stock Units | Minimum |  |  |  |  |
Estimated weighted-average assumptions |  |  |  |  |
Weighted-average expected volatility (as a percent) |  |  | 49.30% |  |
Stock Options and Restricted Stock Units | Maximum |  |  |  |  |
Estimated weighted-average assumptions |  |  |  |  |
Weighted-average expected volatility (as a percent) |  |  | 56.70% |  |
2000 Stock Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awards granted (in shares) |  |  |  | 0 |
Number of shares of common stock available for future grant | 0 |  |  | 0 |
2000 Stock Plan | Stock Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Expiration period | 10 years |  |  |  |
2012 Equity Incentive Plan |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of shares of common stock originally reserved for future grant |  |  |  |  | 6,500,000
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.001
Number of shares of common stock available for future grant | 600,000 |  |  | 600,000 |
2012 Equity Incentive Plan | Restricted Stock Units and Restricted Stock |  |  |  |  |
Additional disclosure |  |  |  |  |
Total forfeiture adjusted unrecognized compensation cost (in dollars) | $ 11,700 |  |  | $ 11,700 |
Weighted-average period over which unrecognized compensation cost is expected to be recognized | 2 years 8 months 12 days |  |  |  |
2012 Equity Incentive Plan | Stock Options |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Expiration period | 7 years |  |  |  |
2012 Equity Incentive Plan | Restricted Stock |  |  |  |  |
Shares/units |  |  |  |  |
Granted (in shares) | 0 | 0 | 0 |  |
2012 Equity Incentive Plan | Stock Options and Restricted Stock Units |  |  |  |  |
Estimated weighted-average assumptions |  |  |  |  |
Weighted-average expected term | 7 years |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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