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Unaudited Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenue | $ 11,925 | $ 12,051 | $ 6,311 | $ 5,985 | $ 12,841 | $ 13,223 | $ 7,006 | $ 13,122 | $ 36,272 | $ 46,192 |
Net income (loss) | 361 | (26) | (1) | (1,913) | (269) | 317 | (728) | 1,195 | (1,579) | 515 | $ 2,912
Net (Loss) Income attributable to Common Stockholders | $ 343 | $ (22) | $ 26 | $ (1,902) | $ (287) | $ 324 | $ (688) | $ 1,209 | $ (1,555) | $ 558 | $ 2,950
Net Income (loss) Per Share (in dollars per share) | $ 0.01 | $ 0.00 | $ 0.00 | $ (0.09) | $ (0.01) | $ 0.02 | $ (0.04) | $ 0.06 | $ (0.07) | $ 0.03 | $ 0.14
Net Income (Loss), Per Share attributable to Common Stockholders (in dollars per share) | $ 0.01 | $ 0.00 | $ 0.00 | $ (0.09) | $ (0.01) | $ 0.02 | $ (0.03) | $ 0.06 | $ (0.07) | $ 0.03 | $ 0.14
Reportable Segment |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment Profit (Loss) | $ 1,973 | $ 720 | $ 715 | $ (811) | $ 215 | $ 1,187 | $ 56 | $ 3,186 | $ 2,597 | $ 4,644 |

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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