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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY (DEFICIT) - 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, 2013 | $ 203,234 | $ 2,091 | $ 612,900 | $ (410,146) | $ (2,450) | $ 839
Balance (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 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 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 |  |  |  |
Non-cash compensation cost for stock options, ESPP and restricted stock | 19,160 | $ 0 | 19,160 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP | 3,802 | $ 13 | 3,789 | 0 | 0 | 0
Exercise of stock options/Purchase under ESPP, shares |  | 1,254,735 |  |  |  |
Restricted stock issued as compensation | 0 | $ 0 | 0 | 0 | 0 | 0
Restricted stock issued as compensation, shares |  | 20,000 |  |  |  |
Payment of capped call transactions and costs | (38,521) |  | (38,521) | 0 | 0 | 0
Unrealized loss on marketable securities | 54 | $ 0 | 0 | 0 | 0 | 54
Foreign currency translation adjustment | (2,744) | 0 | 0 | 0 | 0 | (2,744)
Net loss | (279,966) | 0 | 0 | (279,966) | 0 | 0
Balance ending at Dec. 31, 2016 | $ (5,546) | $ 2,717 | $ 935,997 | $ (929,996) | $ (2,450) | $ (11,814)
Balance ending (in shares) at Dec. 31, 2016 |  | 271,701,397 |  |  |  |

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