Credit Facility (Details) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jun. 13, 2013	Feb. 28, 2015	Sep. 30, 2014	Aug. 31, 2014	Aug. 29, 2013	Jun. 13, 2012
Credit facility
Amount drawn on credit facility	$ 5,000,000	$ 5,000,000
Carrying amount of outstanding debt
Total carrying value		4,764,000
Revolving line of credit
Credit facility
Percentage of eligible accounts receivable in which advances are granted under the credit facility			80.00%
Maximum borrowing capacity			12,000,000	35,000,000		25,000,000
Increase in maximum borrowing capacity, subject to lender's consent				15,000,000
Maximum borrowing capacity, subject to lender's consent				50,000,000
Amount drawn on credit facility					5,000,000
Amount outstanding	0
Remaining borrowing capacity	15,100,000	6,900,000
Commitment fee						50,000
Quick ratio minimum				1.5		1.5
Minimum percentage used in calculation to determine the quick ratio debt covenant requirement						75.00%
Specified amount of draws against credit facility used to determine quick ratio debt covenant requirement						25,000,000
Maximum consolidated leverage ratio, upper end of range				3.00
Maximum consolidated leverage ratio, lower end of range				2.50
Minimum fixed charge coverage ratio				1.25
Carrying amount of outstanding debt
Revolving line of credit		5,000,000
Debt discount, net of accumulated accretion		(236,000)
Total carrying value		4,764,000
Revolving line of credit | Minimum
Credit facility
Unused facility fee (as a percent)				0.00%
Revolving line of credit | Maximum
Credit facility
Unused facility fee (as a percent)				0.20%
Revolving line of credit | Liquidity less than $10 million | Maximum
Credit facility
Liquidity threshold			10,000,000
Revolving line of credit | Liquidity equal to or greater than $10 million but less than $20 million | Minimum
Credit facility
Liquidity threshold			10,000,000
Revolving line of credit | Liquidity equal to or greater than $10 million but less than $20 million | Maximum
Credit facility
Liquidity threshold			20,000,000
Revolving line of credit | Liquidity greater than or equal to $20 million | Minimum
Credit facility
Liquidity threshold			20,000,000
Revolving line of credit | LIBOR | Minimum
Credit facility
Variable rate basis spread (as a percent)				1.75%
Revolving line of credit | LIBOR | Maximum
Credit facility
Variable rate basis spread (as a percent)				2.50%
Revolving line of credit | LIBOR | Variable interest rate, net cash greater than or equal to $1.00
Credit facility
Variable rate basis spread (as a percent)						2.25%
Revolving line of credit | LIBOR | Variable interest rate, net cash greater than or equal to $1.00 | Minimum
Credit facility
Net cash threshold						1.00
Revolving line of credit | LIBOR | Variable interest rate, net cash less than $1.00
Credit facility
Variable rate basis spread (as a percent)						3.75%
Revolving line of credit | LIBOR | Variable interest rate, net cash less than $1.00 | Maximum
Credit facility
Net cash threshold						1.00
Revolving line of credit | Prime rate | Minimum
Credit facility
Variable rate basis spread (as a percent)				0.25%
Revolving line of credit | Prime rate | Maximum
Credit facility
Variable rate basis spread (as a percent)				0.50%
Revolving line of credit | Prime rate | Variable interest rate, net cash greater than or equal to $1.00 | Minimum
Credit facility
Net cash threshold						1.00
Revolving line of credit | Prime rate | Variable interest rate, net cash less than $1.00
Credit facility
Variable rate basis spread (as a percent)						1.50%
Revolving line of credit | Prime rate | Variable interest rate, net cash less than $1.00 | Maximum
Credit facility
Net cash threshold						1.00
Revolving line of credit | Prime rate | Liquidity less than $10 million
Credit facility
Variable rate basis spread (as a percent)			1.75%
Revolving line of credit | Prime rate | Liquidity equal to or greater than $10 million but less than $20 million
Credit facility
Variable rate basis spread (as a percent)			0.50%
Revolving line of credit | Prime rate | Liquidity greater than or equal to $20 million
Credit facility
Variable rate basis spread (as a percent)			0.00%
Revolving line of credit | Common Stock Purchase Warrants
Credit facility
Shares that may be purchased under warrant							66,666
Exercise price of warrants (in dollars per share)							$ 7.92
Amount drawn on credit facility							5,000,000
Debt discount		400,000
Revolving line of credit | Common Stock Purchase Warrants | Draws on credit facility at any time after issuance date
Credit facility
Shares that may be purchased under warrant			26,666					26,666
Exercise price of warrants (in dollars per share)			$ 7.92					$ 11.51
Revolving line of credit | Common Stock Purchase Warrants | Advances greater than $4.0 million at any time after issuance date
Credit facility
Shares that may be purchased under warrant			66,666
Threshold borrowings under the credit facility for higher number of shares under warrant			4,000,000
Letters of credit
Credit facility
Maximum borrowing capacity				$ 10,000,000