WARRANTS (Narrative) (Details)							1 Months Ended									2 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 19, 2017 USD ($) $ / shares shares	Dec. 18, 2017 USD ($) $ / shares	Sep. 28, 2017 USD ($) $ / shares shares	Apr. 25, 2016 $ / shares shares	Jun. 17, 2013 $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares	Feb. 28, 2017 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares shares	Apr. 30, 2016 shares	Oct. 31, 2014 $ / shares shares	Aug. 31, 2014 $ / shares shares	Mar. 31, 2013 $ / shares shares	Jan. 31, 2013 tranche founder $ / shares shares	Oct. 31, 2017 $ / shares shares	Mar. 31, 2013 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($)	Oct. 02, 2017 shares	Mar. 19, 2013 shares
Warrant liabilities
Proceeds from exercises of warrants | $																			$ 260,000	$ 9,272,000
Common stock issued | $	$ 20,000						$ 20,000												27,000	20,000
Non-cash warrant inducement expense | $																			0	2,688,000
Sale of common stock, net of offering costs | $																			21,189,000	15,950,000
Common Stock
Warrant liabilities
Sale of common stock, net of offering costs | $																			$ 6,000	$ 4,000
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares																			6,571,428	3,603,817
Exercise of warrants, cashless (in shares) | shares																				147,847
Founders | Class B Member’s | Resonant LLC
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares						124,998
Placement agents
Assumptions used in estimating fair value of warrants
Equity value | $				$ 200,000
Implied unit price/stock price (in dollars per share)				$ 4.85
Placement agents | Common Stock
Assumptions used in estimating fair value of warrants
Period end after closing																			2 years
Placement agents | Private Placement, Offering One
Assumptions used in estimating fair value of warrants
Sold in private placement (in shares) | shares				87,279
Placement agents | Private Placement, Offering Two
Assumptions used in estimating fair value of warrants
Sold in private placement (in shares) | shares				11,567
Bridge Warrants | Resonant LLC
Warrant liabilities
Number of tranches in which warrants were issued | tranche															2
Proceeds from exercises of warrants | $																	$ 1,000
Bridge Warrants | Founders
Warrant liabilities
Warrant term														5 years	5 years
Exercise price (in dollars per share)						$ 0.20								$ 0.4			$ 0.4
Warrants to purchase shares of common stock or units (in shares) | shares						249,999
Common stock issued | $																			$ 1,600,000
Assumptions used in estimating fair value of warrants
Warrants and Rights outstanding, value | $																			$ 1,600,000
Bridge warrants issued in January 2013
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares														20,833	20,833		20,833
Bridge warrants issued in January 2013 | Class B Member’s | Resonant LLC
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares															62,499								62,499
Consulting Warrant
Warrant liabilities
Exercise price (in dollars per share)																			$ 0.01
Assumptions used in estimating fair value of warrants
Exercise of warrants, cashless (in shares) | shares																			242,913	85,620
Consulting warrants issued in October 2014 | IR Consultant
Warrant liabilities
Warrant term												4 years
Exercise price (in dollars per share)												$ 6.50
Warrants to purchase shares of common stock or units (in shares) | shares												6,000
Financing Warrants
Warrant liabilities
Exercise price (in dollars per share)																			$ 3.35
Assumptions used in estimating fair value of warrants
Exercise of warrants, cashless (in shares) | shares																			5,542	6,842
Private Placement Warrants
Warrant liabilities
Exercise price (in dollars per share)																			$ 2.86
Proceeds from exercises of warrants | $							2,200,000
Non-cash warrant inducement expense | $							239,000
Sale of common stock, net of offering costs | $							$ 2,400,000
Assumptions used in estimating fair value of warrants
Equity value | $																		$ 2,500,000
Implied unit price/stock price (in dollars per share)										$ 2.90								$ 2.90
Expected volatility (as a percent)																		60.00%
Expected dividend rate (as a percent)																		0.00%
Risk free interest rate (as a percent)																		0.97%
Expected Life																		3 years
Exercise of warrants, cashless (in shares) | shares																				49,063
Private Placement Warrants | Private Placement
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares	836,780						836,780				1,996,880									836,780
Private Placement Warrants | Common Stock
Warrant liabilities
Fair value adjustment of warrants | $	$ 166,000
Inducement expense after fair value adjustment | $																				$ 73,000
Assumptions used in estimating fair value of warrants
Equity value | $							$ 3,800,000													$ 3,900,000
Expected volatility (as a percent)							60.00%													10.00%
Expected dividend rate (as a percent)		0.00%
Risk free interest rate (as a percent)			2.00%
Expected Life		1 day					1 year 5 months 1 day
Private Placement Warrants | Minimum | Common Stock
Assumptions used in estimating fair value of warrants
Exercise price (in dollars per share)	$ 6.96						$ 6.96													$ 6.96
Risk free interest rate (as a percent)	1.00%						2.00%
Private Placement Warrants | Maximum | Common Stock
Assumptions used in estimating fair value of warrants
Exercise price (in dollars per share)	$ 7.42						$ 7.42													7.42
Risk free interest rate (as a percent)	1.00%						2.00%
Private Placement Warrants | Investors, Executives and Board Members
Warrant liabilities
Exercise price (in dollars per share)	$ 2.86				$ 2.86		$ 2.86													$ 2.86
Assumptions used in estimating fair value of warrants
Period start after closing					6 months
Period end after closing					36 months
Private Placement Warrants | Investors, Executives and Board Members | Private Placement
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares											1,996,880
Private Placement Warrants | Placement agents
Assumptions used in estimating fair value of warrants
Implied unit price/stock price (in dollars per share)					$ 2.86
Sales of common stock, net of offering costs (in shares) | shares					99,844		836,780
Underwriting Warrant
Warrant liabilities
Exercise price (in dollars per share)																			7.50
Assumptions used in estimating fair value of warrants
Expected volatility (as a percent)			60.00%
Sales of common stock, net of offering costs (in shares) | shares				1,976,919
Underwriting Warrant | Common Stock
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares										2,715,000								2,715,000
Assumptions used in estimating fair value of warrants
Equity value | $																					$ 475,000
Implied unit price/stock price (in dollars per share)										$ 6.54								$ 6.54
Expected volatility (as a percent)																					60.00%
Risk free interest rate (as a percent)																					0.90%
Expected Life				3 years
Underwriting Warrant | Minimum
Assumptions used in estimating fair value of warrants
Implied unit price/stock price (in dollars per share)				$ 4.49
Risk free interest rate (as a percent)				1.59%
Underwriting Warrant | Maximum
Assumptions used in estimating fair value of warrants
Implied unit price/stock price (in dollars per share)				$ 4.69
Risk free interest rate (as a percent)				1.63%
Underwriting Warrant | Investors, Executives and Board Members
Warrant liabilities
Exercise price (in dollars per share)										$ 4.25								$ 4.25
Underwriting Warrant | Investors, Executives and Board Members | Private Placement
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares										135,750
Underwriting Warrant | Placement agents
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares				98,846
Private Placement Warrants - February 2017
Warrant liabilities
Proceeds from exercises of warrants | $		$ 6,700,000
Fair value adjustment of warrants | $		4,100,000
Non-cash warrant inducement expense | $		6,700,000
Inducement expense after fair value adjustment | $		2,600,000
Assumptions used in estimating fair value of warrants
Equity value | $		$ 13,400,000	$ 4,100,000
Implied unit price/stock price (in dollars per share)		$ 8.18	$ 8.18
Expected volatility (as a percent)		10.00%
Risk free interest rate (as a percent)		1.25%
Expected Life			1 year 8 months 1 day
Private Placement Warrants - February 2017 | Private Placement
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares		1,626,898							1,626,898
Assumptions used in estimating fair value of warrants
Period end after closing									30 months
Private Placement Warrants - February 2017 | Investors, Executives and Board Members
Warrant liabilities
Exercise price (in dollars per share)		$ 8.25
Private Placement Warrants - February 2017 | Investors, Executives and Board Members | Common Stock
Warrant liabilities
Exercise price (in dollars per share)									$ 8.25
Private Placement Warrants - February 2017 | Individual Investor | Private Placement
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares		1,626,898
Private Placement Warrants - February 2017 | Individual Investor | Private Placement | Capital Units
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares									1,626,898
Private Placement Warrants, February 2017, After Modifications
Assumptions used in estimating fair value of warrants
Equity value | $		$ 6,700,000
Private Placement Warrants - September 2017
Warrant liabilities
Exercise price (in dollars per share)																			$ 4.85
Assumptions used in estimating fair value of warrants
Equity value | $								$ 3,600,000
Private Placement Warrants - September 2017 | Private Placement
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares) | shares				1,745,581												1,976,919						231,338
Assumptions used in estimating fair value of warrants
Period start after closing									6 months
Private Placement Warrants - September 2017 | Minimum
Assumptions used in estimating fair value of warrants
Implied unit price/stock price (in dollars per share)								$ 4.49
Risk free interest rate (as a percent)								1.59%
Private Placement Warrants - September 2017 | Maximum
Assumptions used in estimating fair value of warrants
Implied unit price/stock price (in dollars per share)								$ 4.69
Risk free interest rate (as a percent)								1.63%
Private Placement Warrants - September 2017 | Investors, Executives and Board Members | Capital Units
Warrant liabilities
Exercise price (in dollars per share)																$ 4.85
Private Placement Warrants - September 2017 | Investors, Executives and Board Members | Private Placement | Capital Units
Assumptions used in estimating fair value of warrants
Sales of common stock, net of offering costs (in shares) | shares																1,976,919
MDB | Consulting Warrant
Warrant liabilities
Warrant term						7 years
Exercise price (in dollars per share)						$ 0.01
Warrants to purchase shares of common stock or units (in shares) | shares						222,222
MDB | Financing Warrants
Warrant liabilities
Warrant term						7 years
Exercise price (in dollars per share)						$ 3.35
Warrants to purchase shares of common stock or units (in shares) | shares						208,763
MDB | Underwriting Warrant
Warrant liabilities
Warrant term						5 years
Exercise price (in dollars per share)						$ 7.50
Warrants to purchase shares of common stock or units (in shares) | shares						310,500
Assumptions used in estimating fair value of warrants
Warrants exercisable period from underwriting agreement						180 days
IR Firm | Consulting warrants issued in August 2014
Warrant liabilities
Number of founders | founder															3
Warrant term													3 years
Exercise price (in dollars per share)															$ 0.40
Warrants to purchase shares of common stock or units (in shares) | shares													42,000
Assumptions used in estimating fair value of warrants
Exercise price (in dollars per share)													$ 8.31
IR Firm | Private Placement Warrants - February 2017
Assumptions used in estimating fair value of warrants
Equity value | $									$ 2,100,000
Implied unit price/stock price (in dollars per share)									$ 4.91
Risk free interest rate (as a percent)									1.50%
Expected Life									3 years
Sales, marketing and administration | Bridge Warrants | Founders
Warrant liabilities
Fair value adjustment of warrants | $																			$ 2,000