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Convertible Notes (Details) - USD ($) |  |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 18, 2018 | Mar. 14, 2016 | Aug. 31, 2017 | Feb. 28, 2017 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Feb. 15, 2018 | Mar. 31, 2016
Convertible Notes |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  | $ 927,000 | $ 687,000 |  |
Senior Secured Convertible Notes due August 15 2018 |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 10.00% |  |  |  | 10.00% |  | 8.00% | 10.00%
Principal amount |  | $ 8,000,000 |  |  |  |  |  |  | $ 8,000,000
Conversion price (in dollars per share) | $ 4.25 |  |  |  |  | $ 8.50 |  |  |
Redemption purchase price (as a percent) | 100.00% |  |  |  |  | 120.00% |  |  |
Minimum ownership percentage triggering event for redemption of notes |  | 40.00% |  |  |  |  |  |  |
Maximum amount of indebtedness subordinated by security interest and cash payment rights under debt instruments | $ 5,000,000 | $ 5,000,000 |  |  |  |  |  |  |
Senior Secured Convertible Notes due August 15 2018 | Minimum |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Percentage of beneficial ownership if effective upon conversion date of debt instrument |  | 9.90% |  |  |  |  |  |  |
Senior Secured Convertible Notes due August 15 2018 | Maximum |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts (in days) |  | 90 days |  |  |  |  |  |  |
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 100,000 |  |  |
Interest Expense |  |  |  |  |  | 45,000 | $ 37,000 |  |
Remaining unamortized debt discount |  |  |  |  |  | $ 30,000 |  |  |
Interest Note |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) |  |  |  |  |  | $ 8.50 |  |  |
Number of shares issuable if notes converted to shares of common stock |  |  |  |  |  | 1,081,166 |  |  |
Semi-annual interest payments |  |  | $ 434,000 | $ 420,000 | $ 336,000 |  |  |  |

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- Definition The period for outstanding balance of accounts receivable has not recorded an allowance for doubtful accounts pledged under the debt instrument conversion features, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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