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Term Loan Obligations (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 19, 2018 | Dec. 29, 2017 | May 29, 2015 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | May 24, 2018 | May 23, 2018 | Sep. 20, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares callable by warrants (in shares) |  |  |  |  |  |  |  | 2,300,000 | 23,400,000 |
Minimum liquidity covenant |  |  |  | $ 1,500,000 |  | $ 1,500,000 |  |  |  |
Interest expense |  |  |  | 444,000 | $ 538,000 | 866,000 | $ 1,129,000 |  |  |
Non-cash amortization |  |  |  | 100,000 | $ 200,000 | $ 200,000 | $ 400,000 |  |  |
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) |  |  | 9,444 |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) |  |  | $ 103.50 |  |  |  |  |  |  |
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 | Dec. 01, 2018 |  |  |  |  | Aug. 01, 2018 |  |  |  |
Debt instrument, interest-only period | The Second Amendment extends the interest-only period under the Term Loan to December 1, 2018 if the Company receives unrestricted gross cash proceeds of at least $15 million from the sale and issuance of the Company’s equity securities on or before August 31, 2018. |  |  |  |  | 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 |  |  |  |  |  |  |  |
Amendment fee | $ 300,000 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Unrestricted gross cash proceeds required to extend interest-only period | $ 15,000,000 |  |  |  |  |  |  |  |  |
Maximum [Member] | Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Original Loan Amount |  |  |  | $ 3,000,000 |  | $ 3,000,000 |  |  |  |

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