Consolidated Statement Of Changes In Redeemable Convertible Preferred Stock And Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Series B redeemable convertible preferred stock	Series A 12% convertible preferred stock	Series C super dividend convertible preferred stock	Consultant	Series B-3 8% convertible preferred stock	Series B-1 12% redeemable convertible preferred stock	Series B-1 12% redeemable convertible preferred stock Series B redeemable convertible preferred stock	Series B-2 12% redeemable convertible preferred stock	Series B-2 12% redeemable convertible preferred stock Series B redeemable convertible preferred stock	Series C super dividend convertible preferred stock	Series A 12% convertible preferred stock	Series A 12% convertible preferred stock Series A 12% convertible preferred stock	Series B-1 12% convertible preferred stock	Series B-2 12% convertible preferred stock	Series B-2 12% convertible preferred stock	Series B-2 12% convertible preferred stock Series B-3 8% convertible preferred stock	Common Stock	Common Stock Series A 12% convertible preferred stock	Common Stock Series B-1 12% redeemable convertible preferred stock	Common Stock Series B-2 12% redeemable convertible preferred stock	Common Stock Series C super dividend convertible preferred stock	Common Stock Consultant	Common Stock Series B-3 8% convertible preferred stock	Common Stock Series B-1 12% convertible preferred stock	Common Stock Series B-2 12% convertible preferred stock	Additional Paid-In Capital	Additional Paid-In Capital Series A 12% convertible preferred stock	Additional Paid-In Capital Series B-1 12% redeemable convertible preferred stock	Additional Paid-In Capital Series B-2 12% redeemable convertible preferred stock	Additional Paid-In Capital Series C super dividend convertible preferred stock	Additional Paid-In Capital Consultant	Additional Paid-In Capital Series B-3 8% convertible preferred stock	Additional Paid-In Capital Series B-1 12% convertible preferred stock	Additional Paid-In Capital Series B-2 12% convertible preferred stock	Retained Deficit	Retained Deficit Series B redeemable convertible preferred stock	Retained Deficit Series A 12% convertible preferred stock	Retained Deficit Series B-1 12% redeemable convertible preferred stock	Retained Deficit Series B-2 12% redeemable convertible preferred stock	Retained Deficit Series C super dividend convertible preferred stock	Retained Deficit Series B-3 8% convertible preferred stock	Retained Deficit Series B-1 12% convertible preferred stock	Retained Deficit Series B-2 12% convertible preferred stock
Stockholders' Equity, Balance (in shares) at Dec. 31, 2014												1,402,500						22,277,283
Stockholders' Equity, Balance at Dec. 31, 2014	$ 21,195											$ 567						$ 22									$ 139,531									$ (118,925)
Temporary Equity, Balance at Dec. 31, 2014							$ 1,731		$ 3,325		$ 1,723
Temporary Equity, Balance (in shares) at Dec. 31, 2014							900,000		2,100,000		176
Accretion of redeemable convertible preferred stock		$ (173)						$ 17		$ 156																											$ (173)
Accretion of beneficial conversion feature for Series B-2	(56)								$ 56																											(56)
Convertible preferred stock dividend																												$ (80)	$ (208)	$ (479)	$ (101)							$ 80	$ 208	$ 479	$ 101
Convertible preferred stock dividend (in shares)																			28,000	88,195	205,788	36,910
Issuance of redeemable convertible preferred stock (in shares)			25,000										(25,000)					4,167	4,167
Issuance of redeemable convertible preferred stock													$ (10)															10
Issuance of common stock	13,701				$ 71													$ 6									13,695					$ 71
Issuance of common stock (in shares)																		6,059,116					30,000
Stock-based compensation expense	3,329																										3,329
Net loss	(20,027)																																			(20,027)
Stockholders' Equity, Balance (in shares) at Dec. 31, 2015												1,377,500						28,825,033
Stockholders' Equity, Balance at Dec. 31, 2015	$ 18,040											$ 557						$ 28									157,504									(140,049)
Temporary Equity, Balance at Dec. 31, 2015				$ 1,723			$ 1,748		$ 3,537		$ 1,723
Temporary Equity, Balance (in shares) at Dec. 31, 2015				176			900,000		2,100,000		176
Issuance of common stock upon exercise of options							$ 0		$ 0		$ 0
Issuance of common stock upon exercise of options	95,574																	95,574
Accretion of redeemable convertible preferred stock	$ (132)						13		119																											(132)
Accretion of beneficial conversion feature for Series B-2	(41)								41																											(41)
Reclassification of Series B-1 and B-2 convertible stock to stockholders' equity upon elimination of redemption feature	5,458						$ (1,761)		$ (3,697)					$ 1,761	$ 3,697
Reclassification of convertible preferred stock, shares							900,000		2,100,000					900,000	2,100,000
Convertible preferred stock dividend																										$ (1)		$ (34)			$ (38)		$ (31)	$ (192)	$ (446)			$ 34			$ 38	$ 31	$ 192	$ 447
Convertible preferred stock dividend (in shares)																			27,550			29,938		32,289	155,020	361,713
Issuance of common stock and warrants in private placements	3,000																	$ 3									2,997
Issuance of common stock and warrants in private placements (in shares)																		2,814,230
Issuance of common stock	$ 416					$ 2,508											$ 1,224										416						$ 2,585									$ (1,301)
Issuance of common stock (in shares)	2,814,000																2,508,000	329,234
Issuance of common stock upon vesting of stock grants to directors																		$ 1									(1)
Issuance of common stock upon vesting of stock grants to directors (in shares)																		337,935
Stock-based compensation expense	$ 2,479																										2,479
Net loss	(21,436)																																			(21,436)
Stockholders' Equity, Balance (in shares) at Dec. 31, 2016												1,377,500		900,000	2,100,000	2,508,000		32,912,942
Stockholders' Equity, Balance at Dec. 31, 2016	$ 10,292											$ 557		$ 1,761	$ 3,697	$ 1,224		$ 33									$ 166,721									$ (163,701)
Temporary Equity, Balance at Dec. 31, 2016				$ 1,723							$ 1,723
Temporary Equity, Balance (in shares) at Dec. 31, 2016				176							176