13. SHAREHOLDERS' EQUITY - Summary of the outstanding and nonvested stock option activity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Shares, Outstanding
Balance, Beginning	277,923
Options granted	32,705
Options expired or canceled	(38,928)
Balance, Ending	271,700	277,923
Weighted Avrage Exercise Price Per Shares, Outstanding
Balance, Beginning	$ 17.21
Options granted	$ 8.85
Options expired or canceled	$ 16.79
Balance, Ending	$ 16.27	$ 17.21
Shares, Nonvested
Balance, Beginning	22,551
Options granted	32,705
Options vested	(12,138)
Balance, Ending	43,118	22,551
Weighted Avrage Exercise Price Per Shares, Nonvested
Balance, Beginning	$ 1.70
Options granted	$ 2.44	$ 2.31
Options vested	$ 1.17
Balance, Ending	$ 2.41	$ 1.70
Nonvested:
Weighted average exercise price of nonvested stock options	$ 8.42
Aggregate intrinsic value of nonvested stock options	$ 43,080
Weighted average remaining contractual term in years of nonvested stock options	8 years 10 months 28 days
Vested:
Number of vested stock options	228,582
Number of options expected to vest	32,339
Weighted average exercise price per share	$ 17.75
Aggregate intrinsic value	$ 56,165
Weighted average remaining contractual term in years	2 years 4 months 2 days