COMMON STOCK - TRANSACTIONS (Details) $ / shares in Units, $ in Thousands		1 Months Ended				9 Months Ended		12 Months Ended
	Apr. 08, 2015 shares	Jul. 31, 2016 shares	Mar. 31, 2016 USD ($) $ / shares shares	Jan. 31, 2016 shares	Jan. 31, 2015 USD ($) shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) shares	Feb. 29, 2016 $ / shares shares
Common stock disclosures
Issuance of common stock upon exercise of stock options (in shares)						135,205
Proceeds from exercise of stock options | $						$ 191	$ 1,009
Proceeds from issuance of stock under ESPP | $						$ 91
Proceeds from exercise of warrants | $							$ 7,788
Reverse stock split ratio	0.25
Stock issued during period, shares, reverse stock splits	1,514
Public Offering, March 2016
Common stock disclosures
Issuance of stock (in shares)			4,293,333
Employee Stock Purchase Plan
Common stock disclosures
Stock issued under ESPP		9,781		6,948
Common Stock
Common stock disclosures
Issuance of common stock upon exercise of stock options (in shares)						135,205		316,177
Proceeds from exercise of stock options | $						$ 191		$ 1,068
Issuance of common stock upon exercise of warrants (in shares)						4,979		1,379,575
Issuance of common stock to 401(k) plan (in shares)						26,638		17,437
Issuance of common stock to 401(k) plan (in dollars) | $						$ 156		$ 201
Number of shares for stock options in cashless exercise (in shares)								52,224
Issuance of stock for noncash exercise-stock options (in shares)								14,961
Issuance of stock for cash-stock options (in shares)								301,216
Number of warrants to purchase common stock (in shares)								40,955
Shares issued through cashless exercise provision-warrants (in shares)								25,052
Issuance of stock for cash- warrants (in shares)								1,354,523
Proceeds from exercise of warrants | $								$ 7,789
Common Stock | Public Offering, March 2016
Common stock disclosures
Warrants for purchase of common stock (in shares)			2,146,666
Equity issuance (in price per unit) | $ / shares			$ 7.49
Common Stock | Public Offering January 2015
Common stock disclosures
Issuance of stock (in shares)					2,000,000
Net proceeds from issuance of equity (in dollars) | $					$ 11,038
Common Stock | Employee Stock Purchase Plan
Common stock disclosures
Stock issued under ESPP						16,729
Proceeds from issuance of stock under ESPP | $						$ 91
Warrants
Common stock disclosures
Warrants for purchase of common stock (in shares)			587,950						395,716
Exercise price (in dollars per unit) | $ / shares			$ 3.87						$ 5.75
Warrants | Public Offering, March 2016
Common stock disclosures
Equity issuance (in price per unit) | $ / shares			0.01
Exercise price (in dollars per unit) | $ / shares			$ 10.00
Percentage of warrant exercises price over public offering price			133.00%
Common Stock And Warrants | Public Offering, March 2016
Common stock disclosures
Issuance of stock (in shares)			4,293,333
Net proceeds from issuance of equity (in dollars) | $			$ 29,905