Employee & Non-Employee Benefits	12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]
Employee & Non-Employee Benefits	13. Employee & Non-Employee Benefits Savings Plan We maintain a 401(k) Savings Plan which covers substantially all full-time employees in the U.S. who meet the plan’s eligibility requirements. Participants are allowed to make tax-deferred contributions up to limitations specified by the Internal Revenue Code. We make 25% matching contributions for amounts that do not exceed 4% of the participants’ compensation. The matched contributions to the employees are subject to a five-year vesting provision, with credit given towards vesting for employment during prior years. We made matching contributions to the plan totaling approximately $936,000, $876,000 and $803,000 in 2018, 2017 and 2016, respectively. In addition, employees outside the U.S. participate in other savings plans. We made contributions to the non-U.S. savings plans totaling approximately $0.3 million in each of the years 2018, 2017 and 2016. Stock Options and Restricted Stock Units Issued to Non-Employees On May 20, 2018, our Compensation Committee approved and granted, under our 2012 Plan, the award of options to purchase 11,000 shares of our common stock to each of our three non-employee members of the board for a total award of 33,000 shares. These options were issued at an exercise price of $12.60 with a seven-year term and vest annually in equal amounts over a two-year term. On May 20, 2017, our Compensation Committee approved and granted, under our 2012 Plan, the award of 4,000 shares of restricted stock units to each of our three non-employee members of the board for a total award of 12,000 restricted stock units. The restricted stock units each vest annually in equal amounts over a two-year period from the dates of grant. On May 20, 2016, our Compensation Committee approved and granted, under our 2012 Plan, the award of options to purchase 12,750 shares of our common stock to each of our non-employee members of our board for a total of 38,250 shares. These options were issued at an exercise price of $10.05 with a seven-year term and vest annually in equal amounts over a two-year term. See Note 4 for more information on our accounting for stock-based compensation.

Employee & Non-Employee Benefits

12 Months Ended

Dec. 31, 2018

13. Employee & Non-Employee Benefits

Savings Plan

We maintain a 401(k) Savings Plan which covers substantially all full-time employees in the U.S. who meet the plan’s eligibility requirements. Participants are allowed to make tax-deferred contributions up to limitations specified by the Internal Revenue Code. We make 25% matching contributions for amounts that do not exceed 4% of the participants’ compensation. The matched contributions to the employees are subject to a five-year vesting provision, with credit given towards vesting for employment during prior years. We made matching contributions to the plan totaling approximately $936,000, $876,000 and $803,000 in 2018, 2017 and 2016, respectively. In addition, employees outside the U.S. participate in other savings plans. We made contributions to the non-U.S. savings plans totaling approximately $0.3 million in each of the years 2018, 2017 and 2016.

Stock Options and Restricted Stock Units Issued to Non-Employees

On May 20, 2018, our Compensation Committee approved and granted, under our 2012 Plan, the award of options to purchase 11,000 shares of our common stock to each of our three non-employee members of the board for a total award of 33,000 shares. These options were issued at an exercise price of $12.60 with a seven-year term and vest annually in equal amounts over a two-year term. On May 20, 2017, our Compensation Committee approved and granted, under our 2012 Plan, the award of 4,000 shares of restricted stock units to each of our three non-employee members of the board for a total award of 12,000 restricted stock units. The restricted stock units each vest annually in equal amounts over a two-year period from the dates of grant. On May 20, 2016, our Compensation Committee approved and granted, under our 2012 Plan, the award of options to purchase 12,750 shares of our common stock to each of our non-employee members of our board for a total of 38,250 shares. These options were issued at an exercise price of $10.05 with a seven-year term and vest annually in equal amounts over a two-year term. See Note 4 for more information on our accounting for stock-based compensation.