RELATED PARTY TRANSACTIONS (Details) (USD $)	1 Months Ended		37 Months Ended	36 Months Ended			9 Months Ended			36 Months Ended		9 Months Ended					12 Months Ended	36 Months Ended					9 Months Ended					36 Months Ended			36 Months Ended		9 Months Ended				12 Months Ended	9 Months Ended
	Oct. 31, 2010 Chief Executive Officer and Chief Scientific Officer [Member]	Jan. 31, 2010 Chief Executive Officer and Chief Scientific Officer [Member]	Mar. 31, 2013 Chief Executive Officer and Chief Scientific Officer [Member]	Dec. 31, 2012 Chief Executive Officer and Chief Scientific Officer [Member] Stock Option One [Member]		Sep. 30, 2013 Chief Executive Officer and Chief Scientific Officer [Member] Stock Option One [Member]	Sep. 30, 2013 Chief Executive Officer and Chief Scientific Officer [Member] Stock Option Two [Member]		Sep. 30, 2013 Chief Executive Officer and Chief Scientific Officer [Member] Stock Option Two [Member] Maximum [Member]	Dec. 31, 2012 Employees and Officers [Member] Stock Option One [Member]		Sep. 30, 2013 Employees and Officers [Member] Stock Option Two [Member]	Sep. 30, 2013 Employees and Officers [Member] Stock Option Two [Member] Minimum [Member]		Sep. 30, 2013 Employees and Officers [Member] Stock Option Two [Member] Maximum [Member]		Dec. 31, 2012 Employees and Officers [Member] Stock Option Two [Member] Maximum [Member]	Dec. 31, 2012 Employees [Member] Stock Option One [Member]	Dec. 31, 2012 Employees [Member] Stock Option One [Member] Minimum [Member]		Dec. 31, 2012 Employees [Member] Stock Option One [Member] Maximum [Member]		Sep. 30, 2013 Employees [Member] Stock Option Two [Member]	Sep. 30, 2013 Employees [Member] Stock Option Two [Member] Minimum [Member]		Sep. 30, 2013 Employees [Member] Stock Option Two [Member] Maximum [Member]		Dec. 31, 2012 Directors [Member] Stock Option One [Member]		Feb. 29, 2012 Directors [Member] Stock Option One [Member]	Dec. 31, 2012 Directors [Member] Stock Option One [Member] Minimum [Member]	Dec. 31, 2012 Directors [Member] Stock Option One [Member] Maximum [Member]	Sep. 30, 2013 Directors [Member] Stock Option Two [Member]		Sep. 30, 2013 Directors [Member] Stock Option Two [Member] Minimum [Member]	Sep. 30, 2013 Directors [Member] Stock Option Two [Member] Maximum [Member]	Dec. 31, 2011 Dr.Hunkapiller [Member]	Sep. 30, 2013 Dr.Hunkapiller [Member] Stock Option One [Member]
Date of grant				Jul. 31, 2010			Mar. 31, 2013			Sep. 30, 2011								Dec. 31, 2012															May 31, 2013
Date of grant start												Jan. 31, 2013											Jan. 31, 2013					Apr. 30, 2012
Date of grant end												Jun. 30, 2013											Aug. 31, 2013					Sep. 30, 2011
Fair value of common stock on date of grant	$ 2.756	$ 2.756	$ 3.00	$ 2.7560	[1]		$ 6.57	[2]		$ 0.9060	[3]		$ 4.11	[2]	$ 4.58	[2]			$ 4.11	[2]	$ 4.24	[2]		$ 3.95	[2]	$ 5.19	[2]	$ 0.9060	[4]				$ 6.59	[2]			$ 0.906	$ 0.906
Exercise price of the options				$ 5.00		$ 5.00	$ 6.57		$ 7.00	$ 1.25			$ 4.11		$ 4.58				$ 4.11		$ 4.24			$ 3.95		$ 5.19				$ 6.00	$ 1.25	$ 6.00	$ 6.00					$ 1.25
Expected life of the options (years)				3 years 3 months 29 days			5 years			5 years 7 months 24 days			5 years		6 years 1 month 10 days				5 years 8 months 26 days		6 years 1 month 10 days			6 years 1 month 2 days		6 years 1 month 10 days					5 years	5 years 7 months 24 days			5 years	5 years 3 months 22 days
Dividend yield				0.00%			0.00%			0.00%		0.00%						0.00%					0.00%					0.00%					0.00%
Expected volatility				58.59%			47.09%			53.90%			40.96%		41.05%				42.44%		44.58%			40.73%		40.92%					53.90%	62.46%			41.06%	41.09%
Risk-free interest rate				1.03%			1.13%			1.08%			1.03%				1.36%		0.91%		0.99%			1.73%		1.97%					0.89%	1.08%			0.73%	0.84%
Expected forfeiture per year (%)				0.00%			0.00%			10.00%		10.00%						10.00%					10.00%					0.00%					10.00%
Weighted-average fair value of the options (per unit)				0.6744			2.70			0.3579			1.69		1.89				1.7426		1.7842			1.35		2.18					0.3579	3.0367			2.41	2.49

[1] The fair value of the Company's common stock was derived implicitly from the public offering filed in March 2010 at $3.00 per share and from the terms of an underwritten offering contemplated in July 2010 at $6.00 per Unit that was filed in October 2010, with $2.756 per share being allocated to common stock using an iterative approach in order for the combined fair value of the common stock and warrants to equal the amount of consideration to be received for the offering.

[2] The fair values of the Company's common stock were derived from the closing prices on the NASDAQ Capital Market as of the dates of grant.

[3] The fair value of the Company's common stock was derived implicitly from the Private Placement during April through June 2011 at $1.25 per Unit, wherein one Unit was comprised of one share of common stock and one warrant to purchase one share of common stock at an exercise price of $1.60 per share.

[4] The fair value of the Company's common stock was derived implicitly from the public offering filed in February 2012 at $6.00 per share.