13. COMMON STOCK AND WARRANTS (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Warrant activity

	Number of Shares			Price per Share		Weighted Average Exercise Price
Balance at December 31, 2012		5,039			$1.80 – $745.50	$	17.10
Warrants issued		3,548			$6.32 – $7.59	$	6.98
Warrants exercised		(285	)		$1.80 – $8.85	$	7.27
Warrants expired		(27	)	$	745.50	$	745.50
Balance at December 31, 2013		8,275			$5.47 – $735.00	$	10.04
Warrants exercised		(6,615	)		$6.09 – $8.85	$	7.17
Warrants expired		(804	)	$	5.47	$	5.47
Balance at December 31, 2014		856			$6.09 – $735.00	$	36.55
Warrants exercised		(42	)	$	8.85	$	8.85
Warrants expired		(432	)	$	8.85	$	8.85
Balance at December 31, 2015		382			$6.09 – $735.00	$	70.87