CONDENSED STATEMENTS OF PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Preferred Stock Series A Preferred Stock	Preferred Stock Series B Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at the beginning at Dec. 31, 2018			$ 1	$ 352		$ (47,297)	$ (46,944)
Balance at the beginning (in shares) at Dec. 31, 2018			1,374,812
Balance at the beginning at Dec. 31, 2018	$ 71,000	$ 91,223
Balance at the beginning (in shares) at Dec. 31, 2018	68,181,819	56,828,851
Increase (Decrease) in Stockholders' Deficit
Stock based compensation				383			383
Issuance of common stock				4			4
Issuance of common stock (in shares)			4,697
Net income (loss)						(6,155)	(6,155)
Balance at the end at Mar. 31, 2019			$ 1	739		(53,452)	(52,712)
Balance at the end (in shares) at Mar. 31, 2019			1,379,509
Balance at the end at Mar. 31, 2019	$ 71,000	$ 91,223
Balance at the end (in shares) at Mar. 31, 2019	68,181,819	56,828,851
Balance at the beginning at Dec. 31, 2019			$ 27	402,529	$ (38)	(81,034)	$ 321,484
Balance at the beginning (in shares) at Dec. 31, 2019			27,499,260				27,499,260
Increase (Decrease) in Stockholders' Deficit
Stock based compensation				1,008			$ 1,008
Issuance of common stock			$ 1	36			37
Issuance of common stock (in shares)			17,142
Unrealized loss on marketable securities, net of tax $0					(505)		(505)
Net income (loss)						9,733	9,733
Balance at the end at Mar. 31, 2020			$ 28	$ 403,573	$ (543)	$ (71,301)	$ 331,757
Balance at the end (in shares) at Mar. 31, 2020			27,516,402				27,516,402