Quarterly report pursuant to Section 13 or 15(d)

CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)

CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	At-the-market offerings [Member] Common Stock [Member]	At-the-market offerings [Member] Additional Paid-In Capital [Member]	At-the-market offerings [Member] Accumulated Deficit [Member]	At-the-market offerings [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
Balance at Dec. 31, 2017					$ 0	$ 4	$ 324,124	$ (323,271)	$ 857
Balance (in shares) at Dec. 31, 2017						3,534
Net loss					0	$ 0	0	(2,605)	(2,605)
Issuance of warrants to purchase common stock, net					0	0	470	0	470
Stock-based compensation					0	0	432	0	432
Balance at Mar. 31, 2018					0	$ 4	325,026	(325,876)	(846)
Balance (in shares) at Mar. 31, 2018						3,534
Balance at Dec. 31, 2017					0	$ 4	324,124	(323,271)	857
Balance (in shares) at Dec. 31, 2017						3,534
Net loss									(5,519)
Balance at Sep. 30, 2018					0	$ 7	334,557	(329,075)	5,489
Balance (in shares) at Sep. 30, 2018						6,561
Balance at Mar. 31, 2018					0	$ 4	325,026	(325,876)	(846)
Balance (in shares) at Mar. 31, 2018						3,534
Net loss					0	$ 0	0	(869)	(869)
Stock-based compensation					0	0	402	0	402
Balance at Jun. 30, 2018					0	$ 4	325,428	(326,745)	(1,313)
Balance (in shares) at Jun. 30, 2018						3,534
Net loss					0	$ 0	0	(2,045)	(2,045)
Issuance of warrants to purchase common stock, net					0	0	51	0	51
Issuance of stock					0	$ 1	1,127	0	1,128
Issuance of stock (in shares)						850
Issuance of preferred stock, net					$ 0		7,280	0	7,280
Issuance of preferred stock, net (in shares)					8
Issuance of common stock upon conversion of preferred stock, net					$ 0	$ 2	(2)	0	0
Issuance of common stock upon conversion of preferred stock, net (in shares)					(8)	2,177
Stock-based compensation					$ 0	$ 0	388	0	388
Deemed dividend resulting from down round provision					0	0	285	(285)	0
Balance at Sep. 30, 2018					$ 0	$ 7	334,557	(329,075)	5,489
Balance (in shares) at Sep. 30, 2018						6,561
Balance at Dec. 31, 2018						$ 13	339,397	(332,579)	6,831
Balance (in shares) at Dec. 31, 2018						13,010
Net loss						$ 0	0	(4,517)	(4,517)
Issuance of common stock upon exercises of warrants, net						$ 0	605	0	605
Issuance of common stock upon exercises of warrants, net (in shares)						404
Stock-based compensation						$ 0	136	0	136
Balance at Mar. 31, 2019						$ 13	340,138	(337,096)	3,055
Balance (in shares) at Mar. 31, 2019						13,414
Balance at Dec. 31, 2018						$ 13	339,397	(332,579)	6,831
Balance (in shares) at Dec. 31, 2018						13,010
Net loss									(12,517)
Balance at Sep. 30, 2019						$ 17	342,419	(345,096)	(2,660)
Balance (in shares) at Sep. 30, 2019						17,114
Balance at Mar. 31, 2019						$ 13	340,138	(337,096)	3,055
Balance (in shares) at Mar. 31, 2019						13,414
Net loss						$ 0	0	(5,197)	(5,197)
Issuance of common stock upon exercises of warrants, net						$ 0	105	0	105
Issuance of common stock upon exercises of warrants, net (in shares)						70
Issuance of common stock upon conversion of convertible loan						$ 1	649	0	650
Issuance of common stock upon conversion of convertible loan, (in shares)						448
Issuance of stock	$ 0	$ 466	$ 0	$ 466
Issuance of stock (in shares)	330
Stock-based compensation						$ 0	350	0	350
Balance at Jun. 30, 2019						$ 14	341,708	(342,293)	(571)
Balance (in shares) at Jun. 30, 2019						14,262
Net loss						$ 0	0	(2,803)	(2,803)
Issuance of common stock upon exercises of warrants, net						$ 1	12	0	13
Issuance of common stock upon exercises of warrants, net (in shares)						1,372
Issuance of stock						$ 2	571	0	573
Issuance of stock (in shares)						1,480
Stock-based compensation						$ 0	128	0	128
Balance at Sep. 30, 2019						$ 17	$ 342,419	$ (345,096)	$ (2,660)
Balance (in shares) at Sep. 30, 2019						17,114