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Long-term Debt (Details) - USD ($)			3 Months Ended
	Dec. 29, 2017	May 29, 2015	Mar. 31, 2018	Mar. 31, 2017	Sep. 20, 2017
Debt Instrument [Line Items]
Minimum liquidity covenant			$ 1,500,000
Interest expense			423,000	$ 591,000
Non-cash amortization			$ 100,000	$ 200,000
LIBOR [Member] | Interest Rate Floor [Member]
Debt Instrument [Line Items]
Basis variable rate		1.00%
Term Loan [Member]
Debt Instrument [Line Items]
Origination Date			May 29, 2015
Original Loan Amount		$ 17,700,000
Basis variable rate		7.95%
Maturity date			Jun. 01, 2019
Fees amount associated with loan		$ 1,100,000
Number of shares callable by warrants (in shares)		94,441
Warrant exercise price (in dollars per share)		$ 10.35
Date from which warrants are exercisable			Nov. 30, 2015
Warrant expiration date			May 29, 2025
Minimum liquidity covenant		$ 5,000,000			$ 1,500,000
Extended interest-only period			Aug. 01, 2018
Debt instrument, interest-only period			The amendment also extended the interest-only period under the Loan Agreement through August 1, 2018, as the Company successfully closed on a financing and received unrestricted net cash proceeds in excess of $5 million on or before December 29, 2017.
Net proceeds excess receives from unrestricted cash	$ 5,000,000
Debt instrument, covenant compliance			we were in compliance with all of the debt covenants under the Loan and Security Agreement.
Minimum [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Interest rate		8.95%
Maximum [Member] | Term Loan [Member]
Debt Instrument [Line Items]
Original Loan Amount			$ 3,000,000

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