CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY - USD ($)	Series 1, Series 2, and 2019 Bridge Note warrants Common Stock Common stock - voting	Series 1, Series 2, and 2019 Bridge Note warrants Additional paid-in capital	Series 1, Series 2, and 2019 Bridge Note warrants	Series 1, Series 2, and 2019 Bridge Note warrants May 2020 Common Stock Common stock - voting	Series 1, Series 2, and 2019 Bridge Note warrants May 2020 Additional paid-in capital	Series 1, Series 2, and 2019 Bridge Note warrants May 2020	Series 1, Series 2, and 2019 Bridge Note warrants June 2020 Common Stock Common stock - voting	Series 1, Series 2, and 2019 Bridge Note warrants June 2020 Additional paid-in capital	Series 1, Series 2, and 2019 Bridge Note warrants June 2020	Series 2 warrants and inducement offer conversion of Series B-1 convertible preferred stock Common Stock Common stock - voting	Series 2 warrants and inducement offer conversion of Series B-1 convertible preferred stock Additional paid-in capital	Series 2 warrants and inducement offer conversion of Series B-1 convertible preferred stock	Series B-2 convertible preferred stock Common Stock Common stock - voting	Series B-2 convertible preferred stock Additional paid-in capital	Series B-2 convertible preferred stock Series B-2 convertible preferred stock	Series B convertible preferred stock Common Stock Common stock - voting	Series B convertible preferred stock Additional paid-in capital	Series B convertible preferred stock Series B convertible preferred stock	PIPE Financing Warrants, Dec 2019	March 2020 Equity Purchase Agreement Common Stock Common stock - voting	March 2020 Equity Purchase Agreement Additional paid-in capital	March 2020 Equity Purchase Agreement	Underwriter Settlement Agreement Common Stock Common stock - voting	Underwriter Settlement Agreement Additional paid-in capital	Underwriter Settlement Agreement	CVP Notes Common Stock Common stock - voting	CVP Notes Additional paid-in capital	CVP Notes	CVP Exchange Notes Common Stock Common stock - voting	CVP Exchange Notes Additional paid-in capital	CVP Exchange Notes	Common Stock Common stock - voting	Common Stock Common stock - non-voting	Additional paid-in capital	Accumulated deficit	Series A convertible preferred stock	Series B convertible preferred stock	Series B-1 convertible preferred stock	Series B-2 convertible preferred stock	Total
Beginning Balance at Dec. 31, 2018																																				$ 9,000,000
Beginning Balance (in shares) at Dec. 31, 2018																																				5,524,926
Ending Balance at Jun. 30, 2019																																				$ 9,000,000
Ending Balance (in shares) at Jun. 30, 2019																																				5,524,926
Beginning Balance at Dec. 31, 2018																																	$ 4,000	$ 99,930,000	$ (94,551,000)					$ 5,383,000
Beginning Balance (in shares) at Dec. 31, 2018																																351,472	40,301,237
Increase (decrease) in Stockholders' Equity (Deficit)
Issuance of common stock to Oasis, put exercise																																		2,602,000						2,602,000
Issuance of common stock to Oasis, put exercise (in shares)																																195,319
Issuance of common stock, registered offering																																		266,000						266,000
Issuance of common stock, registered offering (in shares)																																19,019
Issuance of common stock for Tempesta Settlement, October 2019																														$ 5,584,000	$ 5,584,000	$ 1,000		8,223,000						8,224,000
Issuance of common stock for Tempesta Settlement, October 2019 (in shares)																													817,863			395,970
Fractional shares (in shares)																																(14)
Issuance of common stock in exchange of accrued interest, January 2019																																		447,000						447,000
Issuance of common stock in exchange of accrued interest, January 2019 (in shares)																																19,752
Stock-based compensation																																		873,000						873,000
Net loss																																			(25,025,000)					(25,025,000)
Ending Balance at Jun. 30, 2019																																$ 1,000	$ 4,000	117,925,000	(119,576,000)					$ (1,646,000)
Ending Balance (in shares) at Jun. 30, 2019																																1,799,381	40,301,237
Beginning Balance at Dec. 31, 2018																																				$ 9,000,000
Beginning Balance (in shares) at Dec. 31, 2018																																				5,524,926
Ending Balance at Dec. 31, 2019																																				$ 9,895,000
Ending Balance (in shares) at Dec. 31, 2019																																				5,524,926	1,971	0	10,165	5,537,062
Beginning Balance at Dec. 31, 2018																																	$ 4,000	99,930,000	(94,551,000)					$ 5,383,000
Beginning Balance (in shares) at Dec. 31, 2018																																351,472	40,301,237
Increase (decrease) in Stockholders' Equity (Deficit)
Issuance of common stock in PIPE financing, net of issuance costs of $51																			$ 1,035,000
Ending Balance at Dec. 31, 2019																																$ 1,000	$ 4,000	142,046,000	(133,090,000)		$ 476,000		$ 1,236,000	10,673,000
Ending Balance (in shares) at Dec. 31, 2019																																14,273,061	40,301,237				1,971		10,165
Beginning Balance at Mar. 31, 2019																																				$ 9,000,000
Beginning Balance (in shares) at Mar. 31, 2019																																				5,524,926
Ending Balance at Jun. 30, 2019																																				$ 9,000,000
Ending Balance (in shares) at Jun. 30, 2019																																				5,524,926
Beginning Balance at Mar. 31, 2019																																$ 1,000	$ 4,000	109,644,000	(102,855,000)					6,794,000
Beginning Balance (in shares) at Mar. 31, 2019																																848,785	40,301,237
Increase (decrease) in Stockholders' Equity (Deficit)
Issuance of common stock to Oasis, put exercise																																		100,000						100,000
Issuance of common stock to Oasis, put exercise (in shares)																																4,843
Issuance of common stock in exchange for services																											$ 2,151,000	$ 2,151,000
Issuance of common stock in exchange for services (in shares)																										127,904
Issuance of common stock for Tempesta Settlement, October 2019																														$ 5,584,000	$ 5,584,000
Issuance of common stock for Tempesta Settlement, October 2019 (in shares)																													817,863
Fractional shares (in shares)																																(14)
Stock-based compensation																																		446,000						446,000
Net loss																																			(16,721,000)					(16,721,000)
Ending Balance at Jun. 30, 2019																																$ 1,000	$ 4,000	117,925,000	(119,576,000)					$ (1,646,000)
Ending Balance (in shares) at Jun. 30, 2019																																1,799,381	40,301,237
Beginning Balance at Dec. 31, 2019																																				$ 9,895,000
Beginning Balance (in shares) at Dec. 31, 2019																																				5,524,926	1,971	0	10,165	5,537,062
Ending Balance at Jun. 30, 2020																																				$ 10,878,000
Ending Balance (in shares) at Jun. 30, 2020																																				5,524,926	0	0	7,534	5,534,431
Beginning Balance at Dec. 31, 2019																																$ 1,000	$ 4,000	142,046,000	(133,090,000)		$ 476,000		$ 1,236,000	$ 10,673,000
Beginning Balance (in shares) at Dec. 31, 2019																																14,273,061	40,301,237				1,971		10,165
Increase (decrease) in Stockholders' Equity (Deficit)
Issuance of common stock to Oasis, put exercise																						$ 10,000
Issuance of common stock to Oasis, put exercise (in shares)																					10,000
Issuance of common stock in exchange for services																						33,000
Issuance of common stock in exchange for services (in shares)																				52,000	33,000
Value of shares issued on exercise of warrants		$ 392,000	$ 392,000	$ 1,000	$ 3,787,000	$ 3,788,000		$ 359,000	$ 359,000	$ 1,000	$ 2,340,000	$ 2,341,000
Shares issued on exercise of warrants	548,962			8,670,852			732,315			1,250,000
Issuance of common stock in PIPE financing, net of issuance costs of $51																								$ 45,000	$ 45,000									668,000						668,000
Issuance of common stock (In shares)																							100,000									1,714,283
Underwriter settlement offering cost																								(185,000)	(185,000)
Conversion of Series B convertible preferred stock into common stock														$ 320,000	$ (320,000)		$ 476,000	$ (476,000)
Conversion of Series B convertible preferred stock into common stock (shares)													499,890		(2,631)	4,423,251		(1,971)		68,807
Issuance of warrants for services																								31,000	31,000
Shares issued to third party for services																																		37,000						37,000
Shares issued to third party for services (in shares)																																75,000
Accretion to redemption value of Series A redeemable convertible preferred stock																																		(983,000)		$ 983,000				(983,000)
Stock-based compensation																																		1,509,000						1,509,000
Net loss																																			(17,174,000)					(17,174,000)
Ending Balance at Jun. 30, 2020																																$ 3,000	$ 4,000	150,885,000	(150,264,000)				$ 916,000	$ 1,544,000
Ending Balance (in shares) at Jun. 30, 2020																																32,408,421	40,301,237						7,534
Beginning Balance at Mar. 31, 2020																																				$ 10,375,000
Beginning Balance (in shares) at Mar. 31, 2020																																				5,524,926
Ending Balance at Jun. 30, 2020																																				$ 10,878,000
Ending Balance (in shares) at Jun. 30, 2020																																				5,524,926	0	0	7,534	5,534,431
Beginning Balance at Mar. 31, 2020																																$ 2,000	$ 4,000	145,861,000	(141,026,000)		$ 476,000		$ 916,000	$ 6,233,000
Beginning Balance (in shares) at Mar. 31, 2020																																18,286,196	40,301,237				1,971		7,534
Increase (decrease) in Stockholders' Equity (Deficit)
Issuance of common stock to Oasis, put exercise																					$ 10,000	10,000
Issuance of common stock to Oasis, put exercise (in shares)																				52,000
Issuance of common stock in exchange for services																					$ 33,000	$ 33,000
Issuance of common stock in exchange for services (in shares)																				68,807
Value of shares issued on exercise of warrants				$ 1,000	$ 3,787,000	$ 3,788,000	$ 732,315	$ 359,000	$ 359,000
Shares issued on exercise of warrants				8,670,852
Issuance of common stock in PIPE financing, net of issuance costs of $51																								$ 45,000	45,000
Issuance of common stock (In shares)																							100,000
Conversion of Series B convertible preferred stock into common stock																																		476,000			$ (476,000)
Conversion of Series B convertible preferred stock into common stock (shares)																																4,423,251					(1,971)
Issuance of warrants for services																									$ 31,000
Issuance of warrants for services (in shares)																								31,000
Shares issued to third party for services																																		37,000						37,000
Shares issued to third party for services (in shares)																																75,000
Accretion to redemption value of Series A redeemable convertible preferred stock																																		(503,000)		$ 503,000				(503,000)
Stock-based compensation																																		749,000						749,000
Net loss																																			(9,238,000)					(9,238,000)
Ending Balance at Jun. 30, 2020																																$ 3,000	$ 4,000	$ 150,885,000	$ (150,264,000)				$ 916,000	$ 1,544,000
Ending Balance (in shares) at Jun. 30, 2020																																32,408,421	40,301,237						7,534