Warrants	3 Months Ended
Mar. 31, 2018
Warrants.
Warrants	10. Warrants In April 2014, the Company granted approximately 376,691 warrants to purchase common stock with an exercise price of $2.3229 per common share. The warrants were granted to ROS in connection with a senior secured term loan that has since been repaid and expires on April 18, 2023. It was determined that the warrants granted are detachable and therefore are a standalone component of the senior secured term loan to be fair valued using Level III inputs as a separate derivative. As of March 31, 2018, these warrants remain exercisable for common stock.

10. Warrants

In April 2014, the Company granted approximately 376,691 warrants to purchase common stock with an exercise price of $2.3229 per common share. The warrants were granted to ROS in connection with a senior secured term loan that has since been repaid and expires on April 18, 2023. It was determined that the warrants granted are detachable and therefore are a standalone component of the senior secured term loan to be fair valued using Level III inputs as a separate derivative. As of March 31, 2018, these warrants remain exercisable for common stock.