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Summary of Operations and Significant Accounting Policies - Narrative (Details) $ / shares in Units, $ in Thousands, £ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 14, 2014 | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) | Dec. 31, 2016 GBP (£) shares | Jun. 15, 2016 USD ($) | Jun. 15, 2016 GBP (£) | Nov. 30, 2014 | Jan. 20, 2010
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Common stock authorized (in shares) | shares |  | 100,000,000 | 100,000,000 |  | 100,000,000 |  |  |  |
Common stock par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  |  |  |  |  |
Preferred stock authorized (in shares) | shares |  | 50,000,000 | 50,000,000 |  | 50,000,000 |  |  |  |
Preferred stock par value (in dollars per share) | $ / shares |  | $ 0.001 | $ 0.001 |  |  |  |  |  |
Provision for debt expense |  | $ 0 | $ 100 | $ 0 |  |  |  |  |
Note receivable, impairment charges |  |  | 500 | 500 |  |  |  |  |
Inventory |  | 16 | 189 |  |  |  |  |  |
Gain on contract termination |  | 891 | 0 | 0 |  |  |  |  |
Amortization expense |  | 100 | $ 400 | $ 0 |  |  |  |  |
Estimated future amortization, year one |  | 100 |  |  |  |  |  |  |
Estimated future amortization, year two |  | 100 |  |  |  |  |  |  |
Estimated future amortization, year three |  | 100 |  |  |  |  |  |  |
Estimated future amortization, year four |  | 100 |  |  |  |  |  |  |
Estimated future amortization, year five |  | $ 100 |  |  |  |  |  |  |
Stock split, conversion ratio | 2 |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable payment terms |  | 30 days |  |  |  |  |  |  |
Property and equipment estimated useful lives |  | 2 years |  |  |  |  |  |  |
Warranty term |  | 12 months |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable payment terms |  | 45 days |  |  |  |  |  |  |
Property and equipment estimated useful lives |  | 7 years |  |  |  |  |  |  |
Warranty term |  | 24 months |  |  |  |  |  |  |
Tinuum Group |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, percent |  | 42.50% | 42.50% |  | 42.50% |  |  |  |
Tinuum Services |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, percent |  | 50.00% |  |  | 50.00% |  |  |  | 50.00%
Highview Enterprises Limited |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Ownership interest, percent |  |  |  |  |  |  |  | 8.00% |
Highview Enterprises Limited | Licensed technology |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Long-term licensing agreement, termination fee |  | $ 200 |  |  | £ 0.2 | $ 200 | £ 0.2 |  |
Gain on contract termination |  | $ 200 |  |  |  |  |  |  |

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