COMMON STOCK, TRANSACTIONS (Details) - USD ($)	1 Months Ended	6 Months Ended		12 Months Ended
	Mar. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Feb. 29, 2016
Common stock disclosures
Proceeds from exercise of stock options		$ 26,000	$ 36,000
Proceeds from issuance of stock under ESPP		$ 29,000	$ 43,000
Public Offering, March 2016
Common stock disclosures
Issuance of stock in public offering (in shares)	4,293,333
Common Stock
Common stock disclosures
Issuance of common stock upon exercise of stock options (in shares)		89,387		135,205
Proceeds from exercise of stock options		$ 26,000		$ 191,000
Issuance of common stock upon cashless exercise of warrants (in shares)				4,979
Issuance of common stock to 401(k) plan (in shares)		33,369		37,528
Issuance of common stock to 401(k) plan		$ 113,000		$ 208,000
Stock issued under ESPP (in shares)		7,986		16,729
Proceeds from issuance of stock under ESPP		$ 29,000		$ 91,000
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)	$ 7.49
Warrants
Common stock disclosures
Warrants for purchase of common stock (in shares)	587,950				395,716
Exercise price (in dollars per unit)	$ 3.87				$ 5.75
Warrants | Public Offering, March 2016
Common stock disclosures
Equity issuance (in price per unit)	0.01
Exercise price (in dollars per unit)	$ 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 public offering (in shares)	4,293,333
Net proceeds from issuance of equity (in dollars)	$ 29,900,000