STATEMENT OF CHANGES IN CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Series A Preferred Stock [Member]	Series B Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Stock Subscribed Not Issued [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Total
Begining balance at Dec. 31, 2014			$ 4	$ 26,281	$ 158		$ (32,167)	$ (5,724)
Begining balance (in shares) at Dec. 31, 2014			3,629,921		10,496
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of series B convertible preferred stock for cash		$ 2,941
Issuance of series B convertible preferred stock for cash (in shares)		379,512
Issuance of common stock for services				1	$ 15			16
Issuance of common stock for services (in shares)			100		3,250
Stock-based compensation				11,262				11,262
Issuance of common stock upon exercise of stock options and warrants				78				78
Issuance of common stock upon exercise of stock options and warrants (in shares)			390,873
Issuance of series A convertible preferred stock for cancellation of note	$ 4,380
Issuance of series A convertible preferred stock for cancellation of note (in shares)	400,000
Issuance of series A convertible preferred stock for cash		$ 155
Issuance of series A convertible preferred stock for cash (in shares)		20,000
Issuance of common stock upon conversion of notes				610				610
Issuance of common stock upon conversion of notes (in shares)			80,417
Shares of common stock forfeited					$ (47)			(47)
Shares of common stock forfeited (in shares)					(3,041)
Warrant issued in connection with cancellation of NAU promissory note				330				330
Recognition of warrants issued with 2014/2015 convertible notes				97				97
Recognition of warrant issued with promissory notes				229				229
Reclassification of subscribed shares to common stock				112	$ (112)
Reclassification of subscribed shares to common stock (in shares)			7,455		(7,455)
Dividends paid on preferred shares						17	(17)
Net loss							(18,173)	(18,173)
Ending balance at Dec. 31, 2015	$ 4,380	$ 3,096	$ 4	39,000	$ 14	17	(50,357)	(11,322)
Ending balance (in shares) at Dec. 31, 2015	400,000	399,512	4,108,766		3,250
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of series B convertible preferred stock for cash		$ 896
Issuance of series B convertible preferred stock for cash (in shares)		115,668
Issuance of series B convertible preferred stock for conversion of notes		$ 16
Issuance of series B convertible preferred stock for conversion of notes (in shares)		2,007
Issuance of common stock upon conversion of series A preferred stock	$ (4,380)			4,380				4,380
Issuance of common stock upon conversion of series A preferred stock (in shares)	(400,000)		400,000
Issuance of common stock upon conversion of series B preferred stock		$ (4,008)	$ 1	4,007				4,008
Issuance of common stock upon conversion of series B preferred stock (in shares)		(517,187)	517,187
Issuance of common stock sold for cash			$ 4	18,828				18,832
Issuance of common stock sold for cash (in shares)			4,353,486
Issuance of common stock for services				338	$ 45			$ 383
Issuance of common stock for services (in shares)			126,373		5,250			126,373
Issuance of common stock for services, related parties				295				$ 295
Issuance of common stock for services, related parties (in shares)			13,320
Stock-based compensation				2,689				2,689
Forgiveness of accrued liabilities, related party				2,003				2,003
Issuance of common stock upon exercise of stock options and warrants			$ 1	520				521
Issuance of common stock upon exercise of stock options and warrants (in shares)			630,935
Recognition of warrants issued with unsecured notes				9				9
Cashless exercise of warrants (in shares)			7,225
Dividends paid on preferred shares						(17)	(159)	(176)
Net loss							(10,795)	(10,795)
Ending balance at Dec. 31, 2016			$ 10	$ 72,069	$ 59		$ (61,311)	$ 10,827
Ending balance (in shares) at Dec. 31, 2016			10,157,292		8,500