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Consolidated Financial Statement Detail - Additional Information 2 (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization expense | $ 300,000 | $ 800,000 | $ 1,500,000
Total proceeds from sale of equipment and disposal of certain equipment | 1,614,000 | 49,000 | 18,000
Total carrying value of equipment sold and disposed | 400,000 |  |
Impairment of property and equipment | 200,000 | 200,000 |
Other Income (Expense) [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gain on sale and disposal of equipment | $ 1,200,000 |  |
Equipment and Furniture [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property and equipment under capital lease |  | 300,000 |
Accumulated amortization |  | 100,000 |
Capital lease agreement termination date | 2017-03 |  |
Leasehold Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment of property and equipment | $ 200,000 | $ 200,000 | $ 0

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