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Operating Leases (Details Textual) (USD $)
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12 Months Ended |
0 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Aug. 01, 2014
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| Operating Leases [Line Items] |
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| Operating Leases, Rent Expense, Net |
$ 515,000 |
$ 324,000 |
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| Operating Leases, Future Minimum Payments Due |
1,916,000 |
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| Gaithersburg, Maryland [Member] |
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| Operating Leases [Line Items] |
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| Area Of Operating Lease Property |
12,000 |
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| Gaithersburg, Maryland [Member] | Lease One [Member] | September 2019 [Member] |
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| Operating Leases [Line Items] |
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| Operating Leases, Future Minimum Payments Due |
13,000 |
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| Gaithersburg, Maryland [Member] | Lease Two [Member] | September 2019 [Member] |
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| Operating Leases [Line Items] |
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| Operating Leases, Future Minimum Payments Due |
4,000 |
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| Durham, North Carolina [Member] |
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| Operating Leases [Line Items] |
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| Area Of Operating Lease Property |
16,300 |
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| Operating Leases, Rent Expense, Net |
242,000 |
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| Future Sublease Rental Income |
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13,000 |
| Durham, North Carolina [Member] | December 31, 2018 [Member] |
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| Operating Leases [Line Items] |
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| Operating Leases, Future Minimum Payments Due |
20,000 |
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| Nashville, Tennessee [Member] |
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| Operating Leases [Line Items] |
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| Area Of Operating Lease Property |
2,076 |
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| Nashville, Tennessee [Member] | April 30, 2018 [Member] |
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| Operating Leases [Line Items] |
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| Operating Leases, Future Minimum Payments Due |
$ 4,000 |
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