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Employee Savings Plan | 12 Months Ended
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Dec. 31, 2017
Compensation Related Costs [Abstract] |
Employee Savings Plan and Employee Stock Purchase Plan |
8. | EMPLOYEE SAVINGS PLAN AND EMPLOYEE STOCK PURCHASE PLAN
Our employees that are over the age of 18 and have completed ninety (90) days of service are eligible to participate in our 401(k) plan. We have made a Qualified Automatic Contribution Arrangement (“QACA”) election, whereby we make a matching contribution for our employees equal to 100% of the first 1% of salary deferrals and 50% of salary deferrals between 2% and 6%, up to a maximum matching contribution of 3.5% of an employee’s salary each plan year. We are allowed to make additional discretionary matching contributions and discretionary profit sharing contributions. Employees are 100% vested in amounts attributable to salary deferrals and rollover contributions. The QACA matching contributions as well as the discretionary matching and profit sharing contributions vest 100% after two years of employment from the date of hire. Matching contributions amounted to $4.1 million, $3.5 and $2.4 million for the years ended December 31, 2017, 2016 and 2015, respectively. The ESPP has overlapping offering periods, with each offering period lasting approximately 24 months. At the beginning of each offering period, eligible employees may elect to contribute, through payroll deductions, up to 10% of their compensation, subject to an annual per employee maximum. Eligible employees purchase shares of the Company’s common stock at a price equal to 85% of the fair market value of the shares on the exercise date. The maximum number of shares that may be purchased by a participant during each offering period is 2,000 shares, subject to IRS limits. The shares reserved for purposes of the ESPP are shares we purchase in the open market. The maximum aggregate number of shares of the Company’s common stock that may be purchased by all participants under the ESPP is 2,000,000 shares. During the year ended December 31, 2017, eligible employees purchased 76,728 shares of the Company’s common stock under the ESPP. Compensation expense related to the ESPP is recognized on a straight-line basis over the requisite service period. Our compensation expense related to the ESPP was $0.8 million, $0.6 million and $0.4 million for the years ended December 31, 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 + Details
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