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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member] | Treasury Stock [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Balance beginning at Dec. 31, 2012 | $ 80,240 | $ 1,484 | $ 438,939 | $ (358,163) | $ (2,450) | $ 430
Balance (in shares) at Dec. 31, 2012 |  | 148,398,747 |  |  |  |
Non-cash compensation cost for stock options, ESPP and restricted stock | 2,480 | $ 0 | 2,480 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP | 1,498 | $ 7 | 1,491 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP, shares |  | 667,867 |  |  |  |
Issuance of common stock | 170,590 | $ 600 | 169,990 | 0 | 0 | 0
Issuance of common stock, shares |  | 60,044,130 |  |  |  |
Unrealized gain (loss) on marketable securities | 186 | $ 0 | 0 | 0 | 0 | 186
Foreign currency translation adjustment | 223 | 0 | 0 | 0 | 0 | 223
Net loss | (51,983) | 0 | 0 | (51,983) | 0 | 0
Balance ending at Dec. 31, 2013 | 203,234 | $ 2,091 | 612,900 | (410,146) | (2,450) | 839
Balance ending (in shares) at Dec. 31, 2013 |  | 209,110,744 |  |  |  |
Non-cash compensation cost for stock options, ESPP and restricted stock | 6,090 | $ 0 | 6,090 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP | 2,790 | $ 14 | 2,776 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP, shares |  | 1,411,550 |  |  |  |
Restricted stock issued as compensation | 0 | $ 0 | 0 | 0 | 0 | 0
Restricted stock issued as compensation, shares |  | 15,000 |  |  |  |
Issuance of common stock | 107,895 | $ 288 | 107,607 | 0 | 0 | 0
Issuance of common stock, shares |  | 28,750,000 |  |  |  |
Unrealized gain (loss) on marketable securities | (680) | $ 0 | 0 | 0 | 0 | (680)
Foreign currency translation adjustment | (6,764) | 0 | 0 | 0 | 0 | (6,764)
Net loss | (82,947) | 0 | 0 | (82,947) | 0 | 0
Balance ending at Dec. 31, 2014 | 229,618 | $ 2,393 | 729,373 | (493,093) | (2,450) | (6,605)
Balance ending (in shares) at Dec. 31, 2014 |  | 239,287,294 |  |  |  |
Non-cash compensation cost for stock options, ESPP and restricted stock | 13,431 | $ 0 | 13,431 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP | 4,801 | $ 19 | 4,782 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP, shares |  | 1,950,748 |  |  |  |
Restricted stock issued as compensation | 0 | $ 0 | 0 | 0 | 0 | 0
Restricted stock issued as compensation, shares |  | 25,000 |  |  |  |
Issuance of common stock | 204,275 | $ 292 | 203,983 | 0 | 0 | 0
Issuance of common stock, shares |  | 29,163,620 |  |  |  |
Unrealized gain (loss) on marketable securities | 42 | $ 0 | 0 | 0 | 0 | 42
Foreign currency translation adjustment | (2,561) | 0 | 0 | 0 | 0 | (2,561)
Net loss | (156,937) | 0 | 0 | (156,937) | 0 | 0
Balance ending at Dec. 31, 2015 | $ 292,669 | $ 2,704 | $ 951,569 | $ (650,030) | $ (2,450) | $ (9,124)
Balance ending (in shares) at Dec. 31, 2015 |  | 270,426,662 |  |  |  |

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