Shareholders' equity

9 Months Ended

Sep. 30, 2016

Stockholders' Equity Note [Abstract]

Shareholders' equity

Shareholders’ equity

We have an outstanding authorization from our board of directors to purchase up to 10,000 shares of our common stock. This authorization has no expiration date, and 233 shares remained available for purchase under this authorization as of September 30, 2016. During the nine months ended September 30, 2016, we repurchased 733 shares for $44,944.

In May 2016, our board of directors approved an additional authorization for the repurchase of up to $300,000 of our common stock, effective at the conclusion of our previous authorization. The additional authorization also has no expiration date.