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Consolidated Financial Statements Detail - Additional Information 3 (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Property Plant And Equipment [Line Items] |  |
Total proceeds from sale of equipment and disposal of certain equipment |  | $ 1,614,000
Total carrying value of equipment sold and disposed |  | 400,000
Depreciation expense | $ 30,000 | 300,000
Other Income [Member] |  |
Property Plant And Equipment [Line Items] |  |
Gain (loss) on sale of equipment |  | $ 1,200,000

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