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Restructuring - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) employee | Mar. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) | Sep. 30, 2017 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (3,000) | $ (1,920) | $ (1,801) | $ (2,390) | $ (1,858) | $ (1,773) | $ (3,114) | $ (4,522) |  |  | $ (9,111) | $ (11,267) | $ (16,887) |
Net cash (used in) provided by continuing operations |  |  |  |  |  |  |  |  |  |  | (4,426) | (5,868) | (17,999) |
Cash and cash equivalents | 6,335 |  |  |  | 10,761 |  |  |  | $ 16,629 |  | 6,335 | 10,761 | 16,629 | $ 34,640
Number of positions eliminated | employee |  |  |  |  |  |  | 17 | 20 |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | 1,786 |  |
Decrease in operating expense |  |  |  |  |  |  |  |  |  |  | 3,600 | 8,400 |  |
Restructuring costs and asset impairment charges |  |  |  |  |  |  |  |  |  |  |  | 1,800 |  |
Restructuring |  |  |  |  |  |  |  |  |  |  | 111 | 1,662 | 0 |
Loss on impairment |  |  |  |  |  |  |  |  | $ 900 |  | 0 | 185 | $ 857 |
Obligations to be satisfied, term |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |
Estimate of sublease payments to be received |  |  |  |  |  |  |  |  |  |  | 700 |  |  |
Operating lease, liability | 1,100 |  |  |  |  |  |  |  |  |  | 1,100 |  |  |
Borrowings | 2,219 |  |  |  | $ 0 |  |  |  |  |  | 2,219 | 0 |  |
Severance and Related Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | 770 |  |
Restructuring |  |  |  |  |  |  |  |  |  |  |  | 800 |  |
Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | 830 |  |
Restructuring |  |  |  |  |  |  |  |  |  |  | 100 | 700 |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  |  |  |  | 186 |  |
Restructuring |  |  |  |  |  |  |  |  |  |  |  | $ 100 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 2,200 |  |  |  |  |  |  |  |  |  | $ 2,200 |  |  |

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