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Restructuring - Narrative (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) employee | Mar. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations | $ (1,858,000) | $ (1,773,000) | $ (3,114,000) | $ (4,522,000) | $ (7,805,000) | $ (3,177,000) | $ (3,916,000) | $ (1,977,000) |  | $ (11,267,000) | $ (16,875,000) | $ 9,471,000 |
Net (loss) income | (1,858,000) | (1,773,000) | $ (3,114,000) | $ (4,522,000) | (7,805,000) | $ (3,177,000) | $ (3,916,000) | $ (1,989,000) |  | (11,267,000) | (16,887,000) | 8,780,000 |
Net cash (used in) provided by continuing operations |  |  |  |  |  |  |  |  |  | (5,868,000) | (17,999,000) | 28,161,000 |
Net (decrease) increase in cash and cash equivalents |  |  |  |  |  |  |  |  |  | (5,868,000) | (18,011,000) | 27,205,000 |
Cash and cash equivalents | 10,761,000 |  |  |  | $ 16,629,000 |  |  |  |  | 10,761,000 | 16,629,000 | 34,640,000 | $ 7,435,000
Decrease in operating expense |  |  |  |  |  |  |  |  |  | (8,400,000) |  |  |
Restructuring costs and asset impairment charges |  |  |  |  |  |  |  |  |  | 1,800,000 |  |  |
Loss on impairment |  |  |  |  |  |  |  |  |  | 185,000 | 857,000 | 0 |
Debt and capital lease obligations |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |  |
Number of positions eliminated | employee |  |  | 17 | 20 |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | 1,662,000 | $ 0 | $ 0 |
Obligations to be satisfied, term |  |  |  |  |  |  |  |  | 12 months |  |  |  |
Estimate of sublease payments to be received |  |  |  |  |  |  |  |  |  | 1,200,000 |  |  |
Operating lease, liability | $ 1,700,000 |  |  |  |  |  |  |  |  | 1,700,000 |  |  |
Severance and Related Benefits |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | 770,000 |  |  |
Facilities |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | 708,000 |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | $ 186,000 |  |  |

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