CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Restructuring Liability [Member] Additional Paid-in Capital [Member]	Restructuring Liability [Member]	Side Warrants [Member] Additional Paid-in Capital [Member]	Side Warrants [Member]	Note Conversion Warrants Common Stock	Note Conversion Warrants Additional Paid-in Capital [Member]	Note Conversion Warrants	Note Default [Member] Additional Paid-in Capital [Member]	Note Default [Member]	Preferred Stock [Member] Preferred Stock [Member]	Preferred Stock [Member]	Common Stock Common Stock	Common Stock	Additional Paid-in Capital [Member] Common Stock	Additional Paid-in Capital [Member] Preferred Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Common Stock	Preferred Stock [Member]	Total
Balance at beginning of period at Dec. 31, 2016											$ 8		$ 4			$ 4,376	$ (10,848)			$ (6,460)
Balance at beginning of period (in shares) at Dec. 31, 2016											780,105		449,175
Increase (Decrease) in Stockholders' Equity
Net loss																	(20,694)			(20,694)
Conversion of warrants into stock												$ 20		$ (20)	$ 25				$ 25
Conversion of warrants into stock (in shares)										8,542		1,958,166
Shares converted, value											$ (25)		$ 42			(17)
Conversion of preferred stock into common stock (in shares)											(2,527,879)		4,217,408
Conversion of debt into stock					$ 6	$ 2,732	$ 2,738				$ 8		$ 14			4,749				4,771
Conversion of debt into stock (in shares)					515,638						802,920		1,414,700
Issuance of common stock for consulting services in connection with the merger													$ 3			2,186				2,189
Issuance of common stock for consulting services in connection with the merger (in shares)													321,821
Shares issued in connection with business combination											$ 8		$ 12			20,078				20,098
Shares issued in connection with business combination (in shares)											802,925		1,255,119
Issuance of preferred stock											$ 1					7,783				7,784
Issuance of preferred stock (in shares)											138,322
Issuance of warrants in conjunction with issuance of side agreement	$ 159	$ 159	$ 487	$ 487				$ 15	$ 15
Beneficial conversion feature on issuance of notes																1,856				1,856
Non-cash stock-based compensation and vesting of restricted units													$ 1			56				57
Non-cash stock-based compensation and vesting of restricted units (in shares)													64,593
Balance at end of period at Dec. 31, 2017													$ 102			44,465	(31,542)			13,025
Balance at end of period (in shares) at Dec. 31, 2017											4,935		10,196,620
Increase (Decrease) in Stockholders' Equity
Net loss																	(15,694)			(15,694)
Shares converted, value													$ 65			(65)
Conversion of preferred stock into common stock (in shares)											(4,888)		6,465,334
Conversion of debt into stock												$ 58		$ 2,298				$ 2,356
Conversion of debt into stock (in shares)												5,773,439						3,787,300
Issuance of common stock in connection with purchase agreements													$ 64			1,944				2,008
Issuance of common stock in connection with purchase agreements (in shares)													6,420,723
Issuance of common stock in exchange for cancelation of other current liabilities													$ 18			1,879				1,897
Issuance of common stock in exchange for cancelation of other current liabilities (in shares)													1,814,754
Issuance of common stock upon exercise of warrants													$ 38			1,233				1,271
Issuance of common stock upon exercise of warrants (in shares)													3,787,300
Issuance of common stock for consulting services in connection with the merger																39				39
Issuance of common stock for consulting services in connection with the merger (in shares)													22,913
Warrant modification recorded as debt discount in conjunction with convertible note issuance																11				11
Beneficial conversion feature on issuance of notes																2,118				2,118
Write-off beneficial conversion feature in conjunction with convertible note extinguishment																(1,029)				(1,029)
Write-off debt discounts (net of debt premiums) in conjunction with convertible note conversions																(210)				(210)
Write-off debt derivative liability in conjunction with convertible note conversions																301				301
Liability recorded related to equity purchase agreement repricing																	(460)			(460)
Non-cash stock-based compensation and vesting of restricted units																490				490
Balance at end of period at Dec. 31, 2018													$ 345			$ 53,474	$ (47,696)			$ 6,123
Balance at end of period (in shares) at Dec. 31, 2018											47		34,481,083