Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Jun. 05, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 02, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Pre-funded warrants, shares							270,000
Outstanding pre-funded warrants are exercisable into shares of common stock
Public offering units	7,635,800
Common stock, par value		$ 0.0001				$ 0.0001
Number of warrants to purchase common stock		26,705,502
Share price	$ 0.45
Proceeds from exercise of warrants	$ 10,700	$ 12,237	$ 2,046
Warrants exercise price		$ 1.89
Converted shares		2,253,874
Capital stock shares authorized		155,000,000
Capital stock par value		$ 0.0001
Common stock shares authorized		150,000,000				150,000,000
Restricted Stock [Member]
Fair value of restricted stock units		$ 200
Restricted Stock [Member] | New Chief Executive Officer and President [Member]
Share price		$ 1.10
Stock option granted		182,381
Stock options to purchase a share of common stock		60,794
Stock option vesting period		3 years
Pre-Funded Units [Member]
Public offering units	14,586,400
Share price	$ 0.449
Pre-Funded Warrants [Member]
Number of shares issued for exercise of warrants		14,586,400
July 2016 Offering [Member]
Stock options to purchase		1,976
Stock options exercised		$ 81,510
Series F Warrants [Member]
Common stock, par value	$ 0.0001
Number of warrants to purchase common stock	1	22,688,900
Over allotment shares	3,333,300
Proceeds from exercise of warrants		$ 1,400
Warrants exercise price		$ 0.50
Conversion of converted shares		2,866,600
Series F Warrants [Member] | Pre-Funded Units [Member]
Warrants exercise price	$ 0.495
Warrants expiration date	Jun. 02, 2025
Preferred B Shares [Member]
Share price		$ 0.45
Additional shares of common stock				1,665,414
Shares outstanding				17,303
Preferred stock shares authorized		500,000				500,000
Preferred C Shares [Member]
Share price		$ 0.45
Additional shares of common stock				283,285
Shares outstanding				26,558
Preferred stock shares authorized		1,172,000				1,172,000
Series C Convertible Preferred Stock [Member]
Converted shares		33,322
Series B Convertible Preferred Stock [Member] | July 2016 Offering [Member]
Converted shares		253,587
Received shares of common stock		1,976
Series A Warrants [Member]
Number of warrants to purchase common stock		1,107
Warrants exercise price		$ 8,750.00
Series A Warrants [Member] | July 2016 Offering [Member]
Number of warrants to purchase common stock		5
Common Stock [Member]
Number of shares issued for exercise of warrants		270,000
Number of warrants to purchase common stock	1
Over allotment shares	3,333,300
Conversion of converted shares		2,866,600
Shares outstanding		33,358,994	1,397,133		4,338,910	3,916,134		871,872	768,615
Converted shares		372,173
Preferred Stock Blank Check [Member]
Preferred stock shares authorized		5,000,000