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Schedule I- Condensed Financial Information of Seanergy Maritime Holdings Corp. (Parent Company Only), Statements of Cash Flows - 20F (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 10, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Statements of Cash Flows [Abstract] |  |  |  |  |  |
Net cash used in operating activities |  | $ (12,295) | $ (2,845) | $ (4,737) | $ (14,858) | $ 1,030
Cash flows from investing activities: |  |  |  |  |  |
Net cash (used in) / provided by investing activities |  | 0 | (63,424) | (201,684) | 105,895 | 993
Cash flows from financing activities: |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 4,080 | 4,080 | 10,691 | 13,820 | 3,204 | 0
Proceeds from convertible promissory notes |  | 9,400 | 6,800 | 15,765 | 0 | 0
Partial extinguishment of debt |  | 0 | (200) | (200) | 0 | 0
Restricted cash retained |  |  |  | (50) | 0 | 2,000
Net cash provided by / (used in) financing activities |  | 12,900 | 64,365 | 206,852 | (91,239) | (3,246)
Net increase/(decrease) in cash and cash equivalents |  | 605 | (1,904) | 431 | (202) | (1,223)
Cash and cash equivalents at beginning of period |  | 3,304 | 2,873 | 2,873 | 3,075 | 4,298
Cash and cash equivalents at end of period |  | 3,909 | 969 | 3,304 | 2,873 | 3,075
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |  |  |  |
Cash paid for interest |  | 6,113 | 285 | 855 | 10,557 | 0
Parent Company [Member] |  |  |  |  |  |
Statements of Cash Flows [Abstract] |  |  |  |  |  |
Net cash used in operating activities |  |  |  | (1,202) | (1,195) | (2,806)
Cash flows from investing activities: |  |  |  |  |  |
Investments in subsidiaries |  |  |  | (28,633) | (2,198) | 0
Net cash (used in) / provided by investing activities |  |  |  | (28,633) | (2,198) | 0
Cash flows from financing activities: |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  | 13,820 | 3,204 | 0
Proceeds from convertible promissory notes |  |  |  | 15,765 | 0 | 0
Partial extinguishment of debt |  |  |  | (200) | 0 | 0
Restricted cash retained |  |  |  | (50) | 0 | 0
Due to subsidiaries |  |  |  | 0 | 0 | 5,198
Net cash provided by / (used in) financing activities |  |  |  | 29,335 | 3,204 | 5,198
Net increase/(decrease) in cash and cash equivalents |  |  |  | (500) | (189) | 2,392
Cash and cash equivalents at beginning of period |  | $ 2,078 | $ 2,578 | 2,578 | 2,767 | 375
Cash and cash equivalents at end of period |  |  |  | 2,078 | 2,578 | 2,767
SUPPLEMENTAL CASH FLOW INFORMATION |  |  |  |  |  |
Cash paid for interest |  |  |  | $ 222 | $ 0 | $ 0

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