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Convertible Notes - Additional Information (Details) |  |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 04, 2018 USD ($) | Feb. 18, 2018 | Feb. 17, 2018 | Mar. 14, 2016 USD ($) $ / shares | Oct. 31, 2018 USD ($) $ / shares | Aug. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) $ / shares | Aug. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Aug. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) shares $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  | $ 582,000 | $ 927,000 | $ 687,000
Senior Secured Convertible Notes due August 15 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 10.00% | 8.00% |  | 8.00% |  |  |  |  |  |
Principal amount |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |
Payment on principle amount of note | $ 7,400,000 |  |  |  | $ 7,400,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Senior Secured Convertible Notes due August 15 2018 | Contractual obligations and other termination costs |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |
Interest Expense |  |  |  |  |  |  |  |  |  |  | 30,000 | $ 45,000 | $ 37,000
Senior Secured Convertible Notes due August 15 2018 | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of beneficial ownership if effective upon conversion date of debt instrument |  |  |  | 19.90% |  |  |  |  |  |  |  |  |
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, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 8.50 | $ 0.5717 |  | $ 0.5717 |  |  |  |  |  |
Outstanding Notes payable |  |  |  |  |  |  |  |  |  |  | $ 2,700,000 |  |
Interest Note |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.5717 |  |
Number of shares issuable if notes converted to shares of common stock | shares |  |  |  |  |  |  |  |  |  |  | 4,671,424 |  |
Semi-annual interest payments |  |  |  |  |  | $ 383,000 | $ 463,000 | $ 434,000 | $ 420,000 | $ 336,000 |  |  |

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