WARRANTS (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended		12 Months Ended
	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Aug. 11, 2017	Aug. 10, 2017	Aug. 09, 2017	Feb. 29, 2016
Warrants to purchase common stock issued and outstanding
Proceeds from issuance of common stock and warrants			$ 29,905
Common Stock | Public Offering, March 2016
Warrants to purchase common stock issued and outstanding
Warrants for purchase of common stock (in shares)	2,146,666
Equity issuance (in price per unit)	$ 7.49
Warrants
Warrants to purchase common stock issued and outstanding
Number of Warrants		2,798,246
Weighted average exercise price		$ 8.75
Weighted average life in years		2 years 8 months 16 days
Fair value of warrants
Expected volatility (as a percent)		86.00%		89.00%
Risk-free interest rate (as a percent)		1.50%		1.20%
Expected term (in years)		1 year 7 months 6 days		2 years 4 months 24 days
Warrants | Public Offering, March 2016
Warrants to purchase common stock issued and outstanding
Warrant Exercise Price	10.00
Equity issuance (in price per unit)	$ 0.01
Percentage of warrant exercises price over public offering price	133.00%
Fair value of warrants
Fair value of warrants		$ 11,700
Expected volatility (as a percent)		112.80%
Risk-free interest rate (as a percent)		1.30%
Expected term (in years)		5 years
Expected dividend yield (as a percent)		0.00%
Warrants | Derivative with Exercise Price Four
Warrants to purchase common stock issued and outstanding
Number of Warrants						48,507	10,403
Warrant Exercise Price					$ 0.83	$ 3.87
Warrants for purchase of common stock (in shares)		48,507
Warrants | Derivative with Exercise Price Five
Warrants to purchase common stock issued and outstanding
Number of Warrants	587,950							395,716
Warrant Exercise Price	$ 3.87							$ 5.75
Common Stock And Warrants | Public Offering, March 2016
Warrants to purchase common stock issued and outstanding
Number of shares issued (in shares)	4,293,333
Proceeds from issuance of common stock and warrants	$ 29,900
Equity | Warrants | Derivative with Exercise Price One
Warrants to purchase common stock issued and outstanding
Warrants Issued Year		2010
Number of Warrants		343,931
Warrant Exercise Price		$ 5.60
Equity | Warrants | Derivative with Exercise Price One | Minimum
Warrants to purchase common stock issued and outstanding
Expiration date		Oct. 26, 2017
Equity | Warrants | Derivative with Exercise Price One | Maximum
Warrants to purchase common stock issued and outstanding
Expiration date		Dec. 03, 2017
Equity | Warrants | Derivative with Exercise Price Two
Warrants to purchase common stock issued and outstanding
Warrants Issued Year		2010
Number of Warrants		253,088
Warrant Exercise Price		$ 4.00
Equity | Warrants | Derivative with Exercise Price Two | Minimum
Warrants to purchase common stock issued and outstanding
Expiration date		Oct. 26, 2017
Equity | Warrants | Derivative with Exercise Price Two | Maximum
Warrants to purchase common stock issued and outstanding
Expiration date		Dec. 03, 2017
Equity | Warrants | Derivative with Exercise Price Three
Warrants to purchase common stock issued and outstanding
Warrants Issued Year		2012
Number of Warrants		6,054
Warrant Exercise Price		$ 6.64
Expiration date		Oct. 05, 2019
Equity | Warrants | Derivative with Exercise Price Five
Warrants to purchase common stock issued and outstanding
Warrants Issued Year		2016
Number of Warrants		2,146,666
Warrant Exercise Price		$ 10.00
Expiration date		Mar. 18, 2021
Liability | Warrants | Derivative with Exercise Price Four
Warrants to purchase common stock issued and outstanding
Warrants Issued Year		2014
Number of Warrants		48,507
Warrant Exercise Price		$ 0.83
Expiration date		May 09, 2019