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Stock Benefit Plans and Equity Transactions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended	9 Months Ended
	Mar. 08, 2018	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Oct. 25, 2018	May 17, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Warrant outstanding				20,931,515	20,931,515
Stock-based compensation					$ 3,442	$ 1,669
2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Exercise price of warrants (dollars per share)				$ 2.00	$ 2.00
Warrant outstanding				3,757,000	3,757,000
Number of warrants exercised				1,500,000	1,900,000
Proceeds from exercise of warrant				$ 3,100	$ 4,000
2017 Banker Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Exercise price of warrants (dollars per share)				$ 2.50	$ 2.50
Warrant outstanding				167,418	167,418
2018 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of warrants issued (in shares)				1,275,000	1,275,000
Exercise price of warrants (dollars per share)				$ 3.50	$ 3.50
Warrant outstanding				13,471,851	13,471,851
Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Percentage of outstanding preferred stock shares			75.00%
Number of preferred shares converted					1,274
Number of preferred shares outstanding for being conversion				4,043	4,043
Series A Convertible Preferred Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of preferred shares converted to common stock					636,997
Number of preferred shares outstanding for being conversion to common stock				2,021,673	2,021,673
2017 Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Aggregate gross proceeds for private placement			$ 18,900
2017 Private Placement \| 2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Exercise price of warrants (dollars per share)				$ 2.00	$ 2.00
2017 Private Placement \| 2017 Banker Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Exercise price of warrants (dollars per share)				$ 2.50	$ 2.50
Warrant outstanding				167,418	167,418
Number of warrants exercised					304,182
Proceeds from exercise of warrant					$ 800
2017 Private Placement \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Issuance of common stock upon securities purchase agreement			1,809,628
Common stock purchase price per share			$ 2.00
2017 Private Placement \| Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Preferred stock, shares issued			15,245
Shares issued price per share			$ 1,000
2017 Private Placement \| Series A Convertible Preferred Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Preferred stock convertible to common stock			7,622,372
2018 Private Placement
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Aggregate gross proceeds for private placement	$ 45,200
Exercise price of warrants (dollars per share)	$ 3.50
Proceeds from exercise of warrant		$ 4,800
Warrant expiration period	5 years
2018 Private Placement \| 2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Exercise price of warrants (dollars per share)	$ 2.00
Warrant outstanding	2,400,000
Number of warrants exercised	1,700,000
Proceeds from exercise of warrant	$ 3,400
Additional proceeds expected to be received from remaining warrant exercises	$ 1,400
Remaining warrant exercisable	700,000
2018 Private Placement \| Series A Convertible Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Preferred stock, shares issued	45,200
Shares issued price per share	$ 1,000
2018 Private Placement \| Series A Convertible Preferred Stock \| Certificate of Designation
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Preferred stock convertible to common stock	317							14,349,236
Preferred stock, shares authorized	45,200
Preferred stock, stated value per share	$ 1,000
2018 Private Placement \| Series A Convertible Preferred Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Preferred stock convertible to common stock	12,617,857
Minimum \| 2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Percentage of outstanding voting stock acquired				50.00%	50.00%
Minimum \| 2018 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Percentage of outstanding voting stock acquired				50.00%	50.00%
Maximum \| 2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Beneficial ownership limitation percentage					4.99%
Beneficial ownership, limitation option, percentage					9.99%
Beneficial ownership limitation notification period					61 days
Maximum \| 2017 Private Placement \| 2017 Banker Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of warrants issued (in shares)				471,600	471,600
Maximum \| 2017 Private Placement \| Common Stock \| 2017 Common Stock Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of warrants issued (in shares)				9,432,000	9,432,000
Maximum \| 2018 Private Placement \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of warrants issued (in shares)	12,196,851
2016 Equity Incentive Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of shares available for grant							500,000
2016 Equity Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of shares available for grant							1,250,000
2017 Distributor Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Stock-based compensation				$ 100	$ 200
2017 Distributor Inducement Plan \| Board of Directors \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Share authorized grant of warrants									75,000
2017 Distributor Inducement Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Number of warrants issued (in shares)				300,000	300,000
Common stock issued					17,000
2017 Distributor Inducement Plan \| Common Stock \| Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Share authorized grant of warrants									50,000
2018 Development Services Plan \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line items]
Share authorized grant of warrants									3,000,000
Share elections, grants or payouts									0