15. Warrants

Warrants granted are generally issued for services performed by third parties or investors. As of December 31, 2015, there was no outstanding warrant activity.

The following table provides additional information pertaining to the Company’s warrant activity:


	Year ended December 31,
	2015		2014		2013
Weighted-average grant date fair value for warrants granted during the period	$	—	$	—	$	—
Total fair value of warrants vested during the period		—		—		—
Total intrinsic value of warrants exercised during the period		—		142,625		594,002

In 2014, various parties exercised their warrants in accordance with its terms and as a result 79,677 new shares of common stock were issued. The warrants were net exercised under which 32,623 shares subject to the warrant were cancelled as payment for the shares being issued.

The aggregate intrinsic value of warrants outstanding, vested and unvested expected to vest, and exercisable, represent the total pre‑tax intrinsic value, based on the closing prices of $2.78 of PLPM as reported on NASDAQ on December 31, 2013.