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Consolidated Balance Sheets and Statements of Operations and Comprehensive Loss Components - Inventories/Prepaid/PP&E (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Inventories: |  |  |
Work-in-process | $ 1,071 | $ 1,270 | $ 1,478
Finished goods | 175 | 181 | 119
Total | 1,246 | 1,451 | 1,597
Prepaid expenses and other: |  |  |
Prepaid software |  | 250 | 287
Prepaid insurance |  | 116 | 134
Interest receivable |  | 17 | 48
Prepaid expenses and other |  | 90 | 232
Total | 1,815 | 473 | 701
Property and equipment, net: |  |  |
Property and equipment, gross |  | 6,210 | 5,980
Less: Accumulated depreciation and amortization |  | (4,936) | (4,350)
Property and equipment, net | $ 748 | 1,274 | 1,630
Equipment, furniture and fixtures and leasehold improvements |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross |  | 5,906 | 5,646
Acquired software |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross |  | $ 304 | $ 334

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