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Share Capital, Common Stock (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2010 | Jul. 01, 2008 | Feb. 28, 2019 | Feb. 05, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares (in shares) |  |  |  |  | 458,088 |  |  | 458,088 | 113,076 |  |
Ordinary shares issued (in shares) |  |  |  |  |  | 1,441,048 |  |  |  |  |
Private Placement | Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  |  | 2,727,272 |  |  |  |
December 2016 public offering |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  |  |  |  |  | $ 17,204,000 |  |  | $ 17,204,000 |
Underwriting discount |  |  |  |  |  |  | 710,000 |  |  | $ 710,000 |
Offering expenses |  |  |  |  |  |  | $ 379,000 |  |  |  |
December 2016 public offering | Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  |  |  |  |  |  | 15,640,000 |  |  |  |
Share price (in USD per share) |  |  |  |  |  |  | $ 1.1 |  |  | $ 1.1 |
Audit Committee Chairman |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation value of transaction |  | $ 15,000 |  |  |  |  |  |  |  |  |
Share-based payment (in shares) |  |  |  |  |  |  |  | 18,996 | 31,286 | 62,717 |
Independent directors |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation value of transaction | $ 7,500 |  |  |  |  |  |  |  |  |  |
Share-based payment (in shares) |  |  |  |  |  |  |  | 18,996 | 31,286 | 62,717 |
2016 Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury shares (in shares) |  |  |  |  | 113,076 |  |  | 113,076 |  |  |
2016 Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  |  |  |  |  | 2,000,000
2018 Share Repurchase Program | Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  | 3,000,000 |  |  | 3,000,000 |  |  |
Share repurchased (in shares) |  |  |  |  | 345,012 |  |  |  |  |  |
2018 Share Repurchase Program | Subsequent Event | Common Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share repurchased (in shares) |  |  |  | 1,332,182 |  |  |  |  |  |  |
Repurchased shares canceled (in shares) |  |  | 1,790,270 |  |  |  |  |  |  |  |
Hull No. S 1772 |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Installment payment |  |  |  |  |  | $ 3,300,000 |  |  |  |  |

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