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Summary of Significant Accounting Policies (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) Institution | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2014 USD ($)
Activity under August 2013 contract settlement [Roll Forward] |  |  |  |
Deferred Revenue, beginning of year | $ 2,500 | $ 4,000 | $ 3,000 |
Payment received | 0 | 0 | 2,500 |
Deferred revenue amount recognized | 0 | 1,500 | 1,500 |
Deferred Revenue, end of year | 0 | 2,500 | 4,000 |
Royalty Expense [Abstract] |  |  |  |
Royalties expense as a result of royalty agreement with Leidos | $ 0 | $ 0 | $ 884 |
Prepaid Expense and Other Assets, Current [Abstract] |  |  |  |
Prepayment of facility lease for corporate promotional and marketing purposes |  |  |  | $ 4,000
Lease term | 10 years |  |  |
Concentration of Credit Risk and Others Risks and Uncertainties [Abstract] |  |  |  |
Number of financial institutions holding company's cash | Institution | 2 |  |  |
Income Taxes [Abstract] |  |  |  |
Corporate federal tax rate | 21.00% | 35.00% | 35.00% |
Stock-Based Compensation [Abstract] |  |  |  |
Option vesting term | 4 years |  |  |
Minimum [Member] |  |  |  |
Property and Equipment [Abstract] |  |  |  |
Useful lives | 5 years |  |  |
Intangible Assets [Abstract] |  |  |  |
Estimated useful lives | 3 years |  |  |
Maximum [Member] |  |  |  |
Property and Equipment [Abstract] |  |  |  |
Useful lives | 7 years |  |  |
Intangible Assets [Abstract] |  |  |  |
Estimated useful lives | 15 years |  |  |
Income Taxes [Abstract] |  |  |  |
Corporate federal tax rate |  | 35.00% |  |
ASU Topic 606 [Member] |  |  |  |
Activity under August 2013 contract settlement [Roll Forward] |  |  |  |
ASU 606 Adjustment | $ (2,500) | $ 0 | $ 0 |
New Accounting Pronouncements [Abstract] |  |  |  |
Cumulative effect adjustments |  | (2,500) |  |
ASU Topic 606 [Member] | Deferred Revenue [Member] |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |
Cumulative effect adjustments |  | (2,500) |  |
ASU Topic 606 [Member] | Accumulated Deficit [Member] |  |  |  |
New Accounting Pronouncements [Abstract] |  |  |  |
Cumulative effect adjustments |  | $ (2,500) |  |
Highly Liquid Debt Investments [Member] | Maximum [Member] |  |  |  |
Investments [Abstract] |  |  |  |
Contractual maturities of investment securities | 2 years |  |  |
2013 to 2016 [Member] |  |  |  |
Deferred Revenue [Abstract] |  |  |  |
Total contractual payments received | $ 10,000 |  |  |

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