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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