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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Loss [Member] | Total
--- | --- | --- | --- | --- | ---
Balances at beginning at Dec. 31, 2012 | $ 277 | $ 123,078 | $ (7,339) | $ 101 | $ 116,117
Balances at beginning (in shares) at Dec. 31, 2012 | 27,652,602 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation |  | 184 |  |  | 184
Issuance of common stock to fund ESOP contribution |  | $ 200 |  |  | 200
Issuance of common stock to fund ESOP contribution (in shares) | 53,276 |  |  |  |
Unrealized loss on marketable equity securities |  |  |  | $ (113) | (113)
Issuance of common stock for services |  | $ 48 |  |  | 48
Issuance of common stock for services (in shares) | 30,000 |  |  |  |
Net loss |  |  | $ (7,379) |  | (7,379)
Balances at end at Dec. 31, 2013 | $ 277 | $ 123,510 | $ (14,718) | $ (12) | 109,057
Balances at end (in shares) at Dec. 31, 2013 | 27,735,878 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock-based compensation |  | 318 |  |  | 318
Exercise of employee stock options | $ 2 | (64) |  |  | (62)
Exercise of employee stock options (in shares) | 157,950 |  |  |  |
Exercise of stock purchase warrants |  | 8 |  |  | 8
Exercise of stock purchase warrants (in shares) | 12,112 |  |  |  |
Issuance of common stock to fund ESOP contribution | $ 1 | $ 208 |  |  | 209
Issuance of common stock to fund ESOP contribution (in shares) | 141,721 |  |  |  |
Unrealized loss on marketable equity securities |  |  |  | $ (44) | (44)
Net loss |  |  | $ (2,091) |  | (2,091)
Balances at end at Dec. 31, 2014 | $ 280 | $ 123,980 | $ (16,809) | $ (56) | 107,395
Balances at end (in shares) at Dec. 31, 2014 | 28,047,661 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon vesting of restricted common stock, net | $ 2 | 330 |  |  | 332
Issuance of common stock upon vesting of restricted common stock, net (in shares) | 152,074 |  |  |  |
Stock-based compensation |  | $ 588 |  |  | 588
Realized loss on marketable equity securities |  |  |  | $ 56 | 56
Net loss |  |  | $ (92,896) |  | (92,896)
Balances at end at Dec. 31, 2015 | $ 282 | $ 124,898 | $ (109,705) |  | $ 15,475
Balances at end (in shares) at Dec. 31, 2015 | 28,199,735 |  |  |  |

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