Debt - Additional Information (Details)						3 Months Ended			9 Months Ended
	Aug. 08, 2017 USD ($) $ / shares shares	May 11, 2017 USD ($) lease guarantor $ / shares shares	May 10, 2017 USD ($)	Apr. 29, 2016 USD ($)	Apr. 17, 2015 USD ($) shares	Sep. 30, 2017 USD ($)	May 11, 2017 USD ($) lease guarantor $ / shares shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Nov. 10, 2017 USD ($)	May 12, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Nov. 15, 2016 USD ($)	Apr. 30, 2015 $ / shares
Debt [Line Items]
Interest expense						$ 62,000		$ 103,000	$ 281,000	$ 226,000
Value of stock issued									364,000
Fair value of warrants						0		$ 0	0	$ 59,000
Capital leases, short-term						200,000			200,000
Provant
Debt [Line Items]
Business combinations, line of credit		$ 4,684,000					$ 4,684,000
Number of capital leases | lease		2					2
2017 Public Offering Warrant | Provant
Debt [Line Items]
Warrants strike price (in dollars per share) | $ / shares							$ 1.35
Stocks issued (in shares) | shares							4,375,000
Value of stock issued							$ 3,400,000
Sale of stock, price per share (in dollars per share) | $ / shares		$ 0.80					$ 0.80
Number of shares to be purchased under warrant (in shares) | shares		2					2
A&R Warrant | Provant
Debt [Line Items]
Warrants strike price (in dollars per share) | $ / shares		$ 0.84
Value of stock issued		$ 1,300,000
Number of warrants to purchase shares issued (in shares) | shares												543,479
Term Loans
Debt [Line Items]
Amount of term loan						8,500,000			8,500,000				$ 5,000,000
Term Loans | 2013 Loan and Security Agreement | Contingently Issuable Warrant
Debt [Line Items]
Value of warrant to be issued is debt instrument is not paid				$ 1,250,000
Term Loans | A&R Credit Agreement
Debt [Line Items]
Line of credit facility, maximum borrowing capacity			$ 3,700,000
Expected term					7 years
Debt instrument, fee amount		97,500					$ 97,500
Deferred issuance costs, net						196,000			196,000				336,000
Amount of term loan		$ 3,700,000.0				6,500,000.0	$ 3,700,000.0		6,500,000.0					$ 5,000,000
Maximum quarterly principal payment						500,000
Debt instrument, exit fee percentage		8.00%					8.00%
Legal fees		$ 150,000					$ 150,000
Debt exit fees		$ 400,000					400,000
Interest expense						75,000
Volatility rate (as percent)					85.00%
Risk free interest rate (as percent)					1.40%
Dividend rate (as percent)					0.00%
Number of shares to be purchased under warrant (in shares) | shares					543,479
Term loan, fair value						714,000			714,000				1,122,000
Long-term debt						$ 8,500,000			8,500,000				3,676,000
Term Loans | A&R Credit Agreement | LIBOR
Debt [Line Items]
Spread on variable rate (as percent)		12.50%
Term Loans | A&R Credit Agreement | Minimum | LIBOR
Debt [Line Items]
Spread on variable rate (as percent)		1.00%
Term Loans | A&R Credit Agreement | Annual Aggregate Revenue up to and Including $20 million
Debt [Line Items]
Quarterly revenue-based payments as a percent of annual aggregate revenue (as percent)						15.00%
Annual aggregate revenue limit						$ 20,000,000
Term Loans | A&R Credit Agreement | Annual Aggregate Revenue Greater than $20 million up to and Including $30 million
Debt [Line Items]
Quarterly revenue-based payments as a percent of annual aggregate revenue (as percent)						10.00%
Annual aggregate revenue limit						$ 20,000,000
Term Loans | A&R Credit Agreement | Provant
Debt [Line Items]
Line of credit facility, maximum borrowing capacity		$ 6,500,000					6,500,000
Long-term debt		6,500,000					6,500,000
Term Loans | A&R Credit Agreement | Contingently Issuable Warrant
Debt [Line Items]
Value of warrant to be issued is debt instrument is not paid					$ 1,250,000
Expected term					7 years
Volatility rate (as percent)					80.00%
Risk free interest rate (as percent)					2.10%
Dividend rate (as percent)					0.00%
Term loan, fair value					$ 3,600,000
Term Loans | A&R Credit Agreement | A&R Warrant
Debt [Line Items]
Exercise price of warrant (in dollars per share) | $ / shares															$ 1.30
Term Loans | A&R Credit Agreement | A&R Warrant | Additional Paid-in Capital
Debt [Line Items]
Fair value of warrants					300,000
Term Loans | 2017 Term Loan
Debt [Line Items]
Debt instrument, fee amount	$ 30,000
Long-term debt	2,000,000
Term Loans | 2017 Term Loan | Payment by November 30, 2017
Debt [Line Items]
Debt exit fees	140,000
Term Loans | 2017 Term Loan | Payment after November 30, 2017
Debt [Line Items]
Debt exit fees	$ 280,000
Term Loans | 2017 Term Loan | August Warrant
Debt [Line Items]
Expected term	7 years
Volatility rate (as percent)	79.30%
Risk free interest rate (as percent)	2.10%
Dividend rate (as percent)	0.00%
Exercise price of warrant (in dollars per share) | $ / shares	$ 0.80
Fair value of warrants	$ 200,000
Number of warrants to purchase shares issued (in shares) | shares	450,000
Line of Credit | 2016 Credit and Security Agreement
Debt [Line Items]
Line of credit facility, maximum borrowing capacity			7,000,000.0
Expected term				3 years
Borrowings outstanding						7,900,000			7,900,000
Debt instrument, fee amount				$ 100,000
Commitment fee, percentage (as percent)				0.50%
Collateral fee (as percent)				0.50%
Long-term debt						7,897,000			7,897,000				3,603,000
Line of Credit | 2016 Credit and Security Agreement | Prime rate
Debt [Line Items]
Spread on variable rate (as percent)				5.50%
Line of Credit | 2016 Credit and Security Agreement | Other Assets
Debt [Line Items]
Debt issuance costs, gross				$ 100,000
Deferred issuance costs, net						300,000			300,000
Line of Credit | 2016 Credit and Security Agreement | Provant
Debt [Line Items]
Line of credit facility, maximum borrowing capacity		10,000,000.0					10,000,000.0
Line of credit facility, capacity available during high-volume months		$ 15,000,000					$ 15,000,000
Line of Credit | 2016 Credit and Security Agreement | Subsequent Event
Debt [Line Items]
Borrowings outstanding											$ 12,100,000
Available borrowing capacity											$ 1,700,000
Line of Credit | A&R Credit Agreement
Debt [Line Items]
Cross-default provision on amount of debt outstanding					$ 250,000
Line of Credit | Seasonal Facility
Debt [Line Items]
Long-term debt						2,000,000			2,000,000				0
Line of Credit | Seasonal Facility | Provant | Guarantor Subsidiaries
Debt [Line Items]
Line of credit facility, maximum borrowing capacity												$ 2,000,000
Number of guarantors | guarantor		1					1
Interest payment amount as percentage of outstanding balance (as percent)		25.00%
Line of Credit | Seasonal Facility | 10% Warrant
Debt [Line Items]
Option indexed to issue shares (in shares) | shares		326,052					326,052
Warrants strike price (in dollars per share) | $ / shares		$ 0.6134
Line of Credit | Seasonal Facility | 90% Contingent Warrant
Debt [Line Items]
Option indexed to issue shares (in shares) | shares		2,934,468					2,934,468
Warrants strike price (in dollars per share) | $ / shares		$ 0.6134
Exercisable period of warrants		7 years
Line of Credit | Seasonal Facility | Century Warrants
Debt [Line Items]
Expected term		7 years
Volatility rate (as percent)		80.60%
Risk free interest rate (as percent)		2.22%
Dividend rate (as percent)		0.00%
Line of Credit | Seasonal Facility | 2017 Public Offering Warrant
Debt [Line Items]
Option indexed to issue shares (in shares) | shares		2,187,500					2,187,500
Exercisable period of warrants		4 years
Line of Credit | Seasonal Facility | A&R Warrant
Debt [Line Items]
Expected term		7 years
Exercisable period of warrants		7 years
Volatility rate (as percent)		80.60%
Risk free interest rate (as percent)		2.22%
Dividend rate (as percent)		0.00%
Convertible Subordinated Debt | Subordinated Promissory Note | Century
Debt [Line Items]
Long-term debt			$ 2,500,000
Interest rate (as percent)			8.25%
Convertible Subordinated Debt | Subordinated Promissory Note | Provant
Debt [Line Items]
Amount converted to equity			$ 400,000
Subordinated Debt | Subordinated Promissory Note
Debt [Line Items]
Long-term debt						$ 2,092,000			$ 2,092,000				$ 0
Interest rate (as percent)			8.25%
Tax distribution interest accrual (as percent)			40.00%