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Long-term Obligations (Details) - USD ($) |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 29, 2017 | May 29, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 20, 2017 | Jun. 15, 2016 | May 11, 2016 | May 10, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  |  |  |  |  |  |  | 1 | 1,100,000 | 16,000,000
Warrant exercise price (in dollars per share) |  |  |  |  |  |  |  | $ 3.06 |  |
Minimum liquidity covenant |  |  |  | $ 1,500,000 |  |  |  |  |  |
Future contractual principal and final fee payments on all debt and capital lease obligations [Abstract] |  |  |  |  |  |  |  |  |  |
2018 |  |  |  | 5,192,000 |  |  |  |  |  |
2019 |  |  |  | 8,877,000 |  |  |  |  |  |
Total |  |  |  | 14,069,000 |  |  |  |  |  |
Reconciliation of Face Value to Book Value [Abstract] |  |  |  |  |  |  |  |  |  |
Total debt and lease obligations, including final payment fee (Face Value) |  |  |  | 14,069,000 |  |  |  |  |  |
Less: Debt discount |  |  |  | (445,000) |  |  |  |  |  |
Total obligation |  |  |  | 13,624,000 |  |  |  |  |  |
Interest expense |  |  |  | 2,049,000 | $ 2,592,000 |  |  |  |  |
Non-cash amortization |  |  |  | $ 700,000 | $ 1,000,000 |  |  |  |  |
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 | May 29, 2015 |  |  |  |  |
Original Loan Amount |  |  | $ 17,700,000 | $ 17,700,000 | $ 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 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. |  |  |  |  |  |
Additional details relating term loan that is outstanding [Abstract] |  |  |  |  |  |  |  |  |  |
Origination Date |  |  |  | May 29, 2015 | May 29, 2015 |  |  |  |  |
Original Loan Amount |  |  | $ 17,700,000 | $ 17,700,000 | $ 17,700,000 |  |  |  |  |
Interest Rate | [1] |  |  | 8.95% | 8.95% |  |  |  |  |
Current Monthly Payment |  |  |  | $ 100,000 | $ 136,000 | [2],[3] |  |  |  |
Original Term |  |  |  | 48 months | 48 months |  |  |  |  |
Remaining Principal (Face Value) |  |  |  | $ 12,980,000 | $ 17,700,000 |  |  |  |  |
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 |  |  |
Additional details relating term loan that is outstanding [Abstract] |  |  |  |  |  |  |  |  |  |
Original Loan Amount |  |  |  |  |  |  | $ 3,000,000 |  |  |
[1] | 3 month LIBOR rate with a floor of 1% plus 7.95%
[2] | Monthly payment as of December 2016, which reflects interest only
[3] | Monthly payment as of December 2017, which reflects interest only

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